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DTC P0116:00 [PCM (SKYACTIV-G 2.0)]

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2016 – MX-5 – Engine

DTC P0116:00 [PCM (SKYACTIV-G 2.0)]

NOTE:

  • To determine the malfunctioning part, proceed with the diagnostics from “Function Inspection Using M-MDS”.

Details On DTCs

DESCRIPTION

ECT sensor No.1 circuit range/performance problem

DETECTION CONDITION

Determination conditions

  • During the 5 min after the engine is started, the engine coolant temperature does not increase above 6 °C {11 °F}.

Preconditions

  • Before starting the engine, leave the vehicle with the engine turned off for 6 hours or more.

  • The following DTCs are not detected:

    • ECT sensor No.1: P0117:00, P0118:00

Drive cycle

  • 1

Self test type

  • CMDTC self test

Sensor used

  • ECT sensor No.1

FAIL-SAFE FUNCTION

  • Not applicable

VEHICLE STATUS WHEN DTCs ARE OUTPUT

  • Illuminates check engine light.

POSSIBLE CAUSE

  • ECT sensor No.1 connector or terminals malfunction

  • PCM connector or terminals malfunction

  • ECT sensor No.1 loose

  • ECT sensor No.1 malfunction

  • Poor assembly of engine coolant hose (engine coolant passage malfunction)

  • Poor engine coolant, leakage, or freezing

  • Use of unspecified engine coolant

  • Thermostat malfunction

  • PCM malfunction

System Wiring Diagram

  • Not applicable

Function Explanation (DTC Detection Outline)

  • If the engine coolant temperature detected by the ECT sensor No.1 is not rising 6 °C {11 °F} or more during a 5 min period after the engine is started, the PCM determines an ECT sensor No.1 malfunction and stores a DTC.

Repeatability Verification Procedure

  • Start the engine and leave it idling for 10 s.

  • Switch the ignition off.

  • Leave the vehicle for 6 hours or more.

  • Start the engine and leave it idling for 6 min.

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

Item

Definition

Unit

Condition/Specification

ECT

Engine coolant temperature input from ECT sensor No.1

°C, °F

  • Displays ECT

ECT sensor No.1 voltage

V

    Ignition switched ON (engine off)

  • ECT is 92 °C {198 °F}: Approx. 0.65 V

    Idle (after warm up)

  • ECT is 93 °C {199 °F}: Approx. 0.64 V

    Racing (Engine speed is 2,000 rpm)

  • ECT is 92 °C {198 °F}: Approx. 0.66 V

    Racing (Engine speed is 4,000 rpm)

  • ECT is 93 °C {199 °F}: Approx. 0.64 V

Function Inspection Using M-MDS

STEP

INSPECTION

RESULTS

ACTION

1

PURPOSE: VERIFY RELATED REPAIR INFORMATION AVAILABILITY

  • Verify related Service Bulletins and/or on-line repair information availability.

  • Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

  • If the vehicle is not repaired, go to the next step.

No

Go to the next step.

2

PURPOSE: RECORD FREEZE FRAME DATA/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS TO UTILIZE WITH REPEATABILITY VERIFICATION

NOTE:

  • Recording can be facilitated using the screen capture function of the PC.

  • Record the FREEZE FRAME DATA/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (engine cooling system related) on the repair order.

Go to the next step.

3

PURPOSE: VERIFY CONNECTOR CONNECTIONS

Yes

Repair or replace the applicable connector parts.

Go to the troubleshooting procedure to perform the procedure from Step 7.

No

Go to the next step.

4

PURPOSE: VERIFY ECT SENSOR NO.1 INPUT SIGNAL

Yes

Go to the troubleshooting procedure to perform the procedure from Step 3.

No

Go to the troubleshooting procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

    Intention of troubleshooting procedure

  • Step 1—2

    • Perform an ECT sensor No.1-related inspection.

  • Step 3—5

    • Perform an engine coolant-related inspection.

  • Step 6

    • Perform a unit inspection of the thermostat.

  • Step 7—8

    • Verify that the primary malfunction is resolved and there are no other malfunctions.

STEP

INSPECTION

RESULTS

ACTION

1

PURPOSE: INSPECT INSTALLATION OF ECT SENSOR NO.1

  • Inspect installation of ECT sensor No.1.

  • Is the ECT sensor No.1 installed securely?

Yes

Go to the next step.

No

Retighten the ECT sensor No.1, then go to Step 7.

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

2

PURPOSE: DETERMINE INTEGRITY OF ECT SENSOR NO.1

Yes

Replace the ECT sensor No.1, then go to Step 7.

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

3

PURPOSE: VERIFY IF MALFUNCTION CAUSED BY POOR ENGINE COOLANT PASSAGE ASSEMBLY

Yes

Reconnect the engine coolant passage correctly.

Replace the engine coolant, then go to Step 7.

(See ENGINE COOLANT REPLACEMENT [SKYACTIV-G 2.0].)

No

Go to the next step.

4

PURPOSE: VERIFY IF MALFUNCTION RELATED TO ENGINE COOLANT AFFECTS DIAGNOSTIC RESULTS

  • Inspect the following:

    • Is the system filled with the specified engine coolant?

    • Is there the possibility of freezing (low engine coolant concentration)?

    • Has foreign matter penetrated the engine coolant?

  • Are all items normal?

Yes

Go to the next step.

No

Replace the engine coolant, then go to Step 7. (Advise the customer to use specified engine coolant used.)

(See ENGINE COOLANT REPLACEMENT [SKYACTIV-G 2.0].)

5

PURPOSE: VERIFY IF MALFUNCTION RELATED TO ENGINE COOLANT LEAKAGE FROM ENGINE COOLANT PASSAGE AFFECTS DIAGNOSTIC RESULTS

Yes

Repair or replace the malfunctioning location and refill the system with engine coolant.

(See ENGINE COOLANT REPLACEMENT [SKYACTIV-G 2.0].)

Go to Step 7.

No

Go to the next step.

6

PURPOSE: DETERMINE INTEGRITY OF THERMOSTAT

Yes

Replace the thermostat, then go to the next step.

(See THERMOSTAT REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

7

PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

8

PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION

  • Is any other DTC or pending code stored?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

DTC troubleshooting completed.

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