DTC P151B:00 [PCM (SKYACTIV-G (US))]
DTC P151B:00 [PCM (SKYACTIV-G (US))]
SM2565571
id0102t48893u0
Outline
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System malfunction location |
IAC system problem |
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Detection condition
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• The PCM cannot control the idle speed toward the target idle speed during the KOER self test.
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Fail-safe
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• Not applicable
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Possible cause
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• A/C magnetic clutch malfunction
• Drive-by-wire control system malfunction
• Malfunction in injection amount measurement system (refer to DTC P0101:00)
• Purge solenoid valve malfunction
• Air cleaner element restricted
• Throttle body passage blockage
• Engine malfunction
• Generator control circuit malfunction
• PCM malfunction
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System wiring diagram
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• Not applicable
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Connector diagram
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• Not applicable
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Diagnostic Procedure
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Step |
Inspection |
Results |
Action |
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1
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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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2
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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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3
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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.
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No
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Go to the next step.
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4
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INSPECT A/C MAGNETIC CLUTCH OPERATION
• Turn the A/C switch off.
• Is the magnetic clutch still on?
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Yes
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Perform the symptom troubleshooting “A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY”.
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No
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Go to the next step.
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5
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INSPECT DRIVE-BY-WIRE CONTROL SYSTEM MALFUNCTION
• Perform the Drive-by-wire Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [SKYACTIV-G (US)].)
• 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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6
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INSPECT PURGE SOLENOID VALVE
• Perform the Purge Control System Inspection. (See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• 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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7
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INSPECT AIR CLEANER ELEMENT FOR MALFUNCTION
• Remove the air cleaner element with the engine is running. (See AIR CLEANER ELEMENT REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See AIR CLEANER ELEMENT REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Does the engine speed increase?
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Yes
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Clean or replace the air cleaner element and perform the repair completion verification.
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No
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Go to the next step.
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8
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INSPECT THROTTLE BODY PASSAGE
• Visually inspect the throttle body passage.
• Is the throttle body passage dirty and/or restricted?
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Yes
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Clean or replace the throttle body passage and perform the repair completion verification.
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No
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Go to the next step.
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9
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INSPECT ENGINE COMPRESSION
• Inspect the engine compression. (See COMPRESSION INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See COMPRESSION INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Are compression pressures within specification?
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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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INSPECT GENERATOR CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY
• Apply the electrical load (such as blower fan, rear window defogger, or headlight).
• Does the engine speed increase?
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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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Repair completion verification 1
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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?
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Yes
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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, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
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No
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Go to the next step.
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Repair completion verification 2
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VERIFY IF OTHER DTCs DISPLAYED
• Perform the DTC inspection. (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.
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No
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DTC troubleshooting completed.
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