DTC P0171:00 [PCM (SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US)))]
DTC P0171:00 [PCM (SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US)))]
SM2565577
id0102t49342u5
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Note
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• To determine the malfunctioning part, proceed with the diagnostics from “Function Inspection Using M-MDS”.
Details On DTCs
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Description |
Fuel trim system too lean |
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Detection condition
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Determination conditions
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• Any one of the following conditions is met:
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Preconditions
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• Engine coolant temperature: 0—45 °C {32—113 °F}, 60 °C {140 °F} or more *1
*1: Standard can be verified by displaying PIDs using M-MDS
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Malfunction determination period
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• 10 s or 20 s period
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Drive cycle
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• 2
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Self test type
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• CMDTC self test
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Sensor used
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• A/F sensor
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Fail-safe function
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• Not applicable
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Vehicle status when DTCs are output
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• Not applicable
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Possible cause
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• Erratic signal to PCM
• High-pressure side fuel delivery system malfunction
• Fuel leakage in fuel line
• Low-pressure side fuel delivery system malfunction
• Fuel injector malfunction
• Improper operation of purge control system
• PCV valve malfunction
• MAF sensor malfunction
• Air cleaner element malfunction
• MAP sensor malfunction
• Air suction in intake air system
• Improper operation of electric variable valve timing control system
• Improper operation of hydraulic variable valve timing control system
• A/F sensor malfunction
• Poor fuel quality
• PCM malfunction
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System Wiring Diagram
• Not applicable
Function Explanation (DTC Detection Outline)
• The PCM detects the oxygen concentration in the exhaust gas from the A/F sensor signal and performs fuel injection amount feedback to maintain the optimum air/fuel ratio. If a condition in which the feedback correction amount is large (fuel injection amount being increased) continues for the specified time, a feedback correction amount malfunction is determined, and a DTC is stored. The feedback correction amount has a “Fuel feedback correction amount” for the air/fuel ratio and a “Fuel learning correction amount” for fuel injector deterioration over time.
• “Fuel feedback correction amount (SHRT_FUEL_TRIM)” and “Fuel learning correction amount (LONG_FUEL_TRIM)” can be verified from the M-MDS PID item.
1. The sum of the fuel feedback correction amount (SHRT_FUEL_TRIM) and the fuel learning correction amount (LONG_FUEL_TRIM) is the specified value ( 30 %) or more, and 10 s or more have elapsed with the fuel learning correction amount (LONG_FUEL_TRIM) at the specified value ( 15 %) or more. Engine coolant temperature: 0—45 °C {32—113 °F}, 60 °C {140 °F} or more
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2. The fuel feedback correction amount reaches the upper limit ( 25% or more) for 20 s or more. Engine coolant temperature: 0—45 °C {32—113 °F}, 60 °C {140 °F} or more
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Repeatability Verification Procedure
1. Warm up the engine to allow the engine coolant temperature to reach 80 °C {176 °F} or more.
2. Start the engine and leave it idling for 1 min.
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Note
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• Match the engine coolant temperature in the recorded freeze frame data/snapshot data, the vehicle speed, and engine speed values to the best extent possible while driving the vehicle.
3. Try to reproduce the malfunction by driving the vehicle for 5 min based on the values in the freeze frame data/snapshot data.
PID Item/Simulation Item Used In Diagnosis
PID/DATA monitor item table
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PIDs |
Reference |
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APP_RELAT
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ECT
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ECT_VOLT
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PRG_DUTY
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FUEL_PUMP_REQ
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FUEL_PRES
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IAT2
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MAF
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MAP
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MAP_VOLT
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A/F_SEN_CUR
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TP_RELAT
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VLV_TIMING_ACT_EX
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VLV_TIMING_DSD_EX
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VLV_TIMING_ACT_IN
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VLV_TIMING_DSD_IN
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Simulation item table
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Simulation items |
Reference |
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FUEL_PUMP_REQ
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INJ
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Function Inspection Using M-MDS
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Step |
Inspection |
Results |
Action |
|---|---|---|---|
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1
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PURPOSE: VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY
• Verify related Service Bulletins, on-line repair information, or Service Information availability.
• Is any related Information available?
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Yes
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Perform repair or diagnosis according to the available information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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2
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PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is the DTC P0171:00 on freeze frame data?
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Yes
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Go to the next step.
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No
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Go to the troubleshooting procedure for DTC on freeze frame data.
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3
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PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION
• Record the freeze frame data/snapshot data.
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—
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Go to the next step.
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4
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PURPOSE: VERIFY IF INPUT SIGNAL TO PCM AFFECTS FUEL INJECTION
• Start the engine.
• Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.)
• Is there any signal that is far out of specification? (See PID/DATA MONITOR TABLE [PCM (SKYACTIV-G (US))].)
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Yes
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Inspect the suspected sensor and related wiring harness.
• If there is any malfunction:
• If there is no malfunction:
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No
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Go to the next step.
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5
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PURPOSE: VERIFY CONNECTOR CONNECTIONS
• Start the engine.
• Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.)
• When the following parts are shaken, does the PID value include a PID item which has changed?
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Yes
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Repair or replace the applicable connector parts.
Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification.
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No
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Go to the next step.
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6
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PURPOSE: VERIFY FUEL PRESSURE (HIGH-SIDE) MALFUNCTION
• Switch the ignition off.
• Reconnect all disconnected connectors.
• Start the engine and warm it up completely.
• Access the FUEL_PRES PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Is the FUEL_PRES PID value approx. 10 MPa {102 kgf/cm2, 1450 psi}?
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Yes
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Go to the next step.
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No
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FUEL_PRES PID value is lower than 10 MPa {102 kgf/cm2, 1450 psi}:
• Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
FUEL_PRES PID value is higher than 10 MPa {102 kgf/cm2, 1450 psi}:
• Go to Step 8.
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7
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PURPOSE: VERIFY FUEL PRESSURE (LOW-SIDE) MALFUNCTION
• Bleed the remaining pressure in the fuel line using the following procedure.
• Switch the ignition off.
• Install the fuel pump relay.
• Switch the ignition ON (engine off).
• Display PID FUEL_PRES and simulation item FUEL_PUMP_REQ using the M-MDS. (See PID/DATA MONITOR INSPECTION.) (See SIMULATION INSPECTION.)
• Turn simulation item FUEL_PUMP_REQ on.
• Is the FUEL_PRES PID value 475—555 kPa {4.85—5.65 kgf/cm2, 68.9—80.4 psi}?
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Yes
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Go to the next step.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 5.
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8
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PURPOSE: VERIFY IF MALFUNCTION CAUSED BY FUEL INJECTOR IMPROPER OPERATION
• Switch the ignition off.
• Reconnect all disconnected connectors.
• Start the engine and idle it.
• Access the following simulation items using the M-MDS: (See SIMULATION INSPECTION.)
• Turn each fuel injector from on to off using the simulation items.
• Does the vibration during idling worsen?
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Yes
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Go to the next step.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 7.
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9
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PURPOSE: VERIFY IF MALFUNCTION CAUSED BY PURGE SOLENOID VALVE IMPROPER OPERATION
• Start the engine and idle it.
• Access the PRG_DUTY PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Is the PRG_DUTY PID value normal?
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Yes
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Go to the next step.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 8.
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10
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PURPOSE: VERIFY MAF SENSOR
• Start the engine and idle it.
• Access the MAF PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Is the MAF PID value normal?
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Yes
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Go to the next step.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 10.
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11
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PURPOSE: VERIFY MAP SENSOR
• Start the engine and idle it.
• Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.)
• Are all items normal?
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Yes
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Go to the next step.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 12.
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12
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PURPOSE: VERIFY INTAKE VALVE TIMING
• Start the engine and idle it.
• Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.)
• Depress the accelerator pedal to increase the engine speed.
• Does the monitor value of the PID item VLV_TIMING_ACT_IN conform to the VLV_TIMING_DSD_IN PID value?
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Yes
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Go to the next step.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 14.
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13
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PURPOSE: VERIFY EXHAUST VALVE TIMING
• Start the engine and idle it.
• Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.)
• Perform the following:
• Does the monitor value of the PID item VLV_TIMING_ACT_EX conform to the VLV_TIMING_DSD_EX PID value?
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Yes
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Go to the next step.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 17.
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14
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PURPOSE: VERIFY A/F SENSOR
• Access the A/F_SEN_CUR PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Is the A/F_SEN_CUR PID value normal?
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Yes
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Go to the next step.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 18.
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15
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PURPOSE: INSPECT FOR OTHER RELATED DTCs
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any other DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
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No
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Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
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Troubleshooting Diagnostic Procedure
Intention of troubleshooting procedure
• Step 1—7
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― Perform a fuel injector control system inspection.
• Step 8—9
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― Perform an emission system parts inspection.
• Step 10—13
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― Perform an intake air system parts inspection.
• Step 14—17
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― Perform a valve timing inspection.
• Step 18—19
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― Perform an exhaust system parts inspection.
• Repair completion verification
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― Verify that the primary malfunction is resolved and there are no other malfunctions.
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Step |
Inspection |
Results |
Action |
|---|---|---|---|
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1
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PURPOSE: VERIFY IF CAUSE OF MALFUNCTION IS RELATED TO LACK OF FUEL
• Verify the remaining amount of fuel.
• Is there a lack of fuel?
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Yes
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Refill the fuel and perform the repair completion verification.
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No
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Go to the next step.
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2
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PURPOSE: INSPECT FUEL PRESSURE SENSOR FOR MALFUNCTION
• Inspect the applicable part. (See FUEL PRESSURE SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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3
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PURPOSE: INSPECT HIGH PRESSURE FUEL PUMP FOR MALFUNCTION
• Inspect the applicable part. (See HIGH PRESSURE FUEL PUMP INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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4
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PURPOSE: VERIFY IF MALFUNCTION RELATED TO FUEL LEAK FROM FUEL SYSTEM OR RESTRICTION AFFECTS DIAGNOSTIC RESULTS
• Inspect the fuel system pipes (low to high pressure sides) for fuel leakage and restriction.
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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5
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PURPOSE: INSPECT FUEL PUMP CONTROL MODULE FOR MALFUNCTION
• Inspect the applicable part. (See FUEL PUMP CONTROL MODULE INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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6
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PURPOSE: INSPECT FUEL PUMP UNIT FOR MALFUNCTION
• Inspect the applicable part. (See FUEL PUMP UNIT INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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7
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PURPOSE: INSPECT FUEL INJECTOR FOR MALFUNCTION
• Inspect the applicable part. (See FUEL INJECTOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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8
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PURPOSE: INSPECT PURGE SOLENOID VALVE FOR MALFUNCTION
• Inspect the applicable part. (See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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9
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PURPOSE: INSPECT PCV VALVE FOR MALFUNCTION
• Inspect the applicable part. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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10
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PURPOSE: INSPECT MAF SENSOR FOR MALFUNCTION
• Inspect the applicable part. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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11
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PURPOSE: VERIFY IF MALFUNCTION RELATED TO AIR CLEANER ELEMENT AFFECTS MEASUREMENT OF INTAKE AIR AMOUNT
• Inspect the applicable part. (See AIR CLEANER ELEMENT INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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12
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PURPOSE: INSPECT MAP SENSOR FOR MALFUNCTION
• Inspect the applicable part. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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13
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PURPOSE: VERIFY IF MALFUNCTION RELATED TO INTAKE AIR SYSTEM AFFECTS DIAGNOSTIC RESULTS
• Visually inspect for loose, cracked or damaged hoses on intake air system.
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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14
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PURPOSE: INSPECT ELECTRIC VARIABLE VALVE TIMING DRIVER FOR MALFUNCTION
• Inspect the applicable part. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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15
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PURPOSE: INSPECT ELECTRIC VARIABLE VALVE TIMING MOTOR FOR MALFUNCTION
• Inspect the applicable part. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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16
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PURPOSE: INSPECT ELECTRIC VARIABLE VALVE TIMING ACTUATOR FOR MALFUNCTION
• Inspect the applicable part. (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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17
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PURPOSE: INSPECT OCV FOR MALFUNCTION
• Inspect the applicable part. (See OIL CONTROL VALVE (OCV) INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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18
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PURPOSE: INSPECT A/F SENSOR FOR MALFUNCTION
• Inspect the applicable part. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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19
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PURPOSE: VERIFY IF MALFUNCTION RELATED TO EMISSION SYSTEM AFFECTS HO2S SIGNAL
• Verify the exhaust gas leakage from the exhaust system. (between A/F sensor and HO2S)
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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Repair completion verification
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PURPOSE: VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Clear the DTC recorded in the memory. (See CLEARING DTC.)
• Replicate the vehicle conditions at the time the DTC was detected using the following procedure.
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Is the same Pending DTC present?
|
Yes
|
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
• If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
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No
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DTC troubleshooting completed.
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