Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Inspection Procedure
- CHECK THAT MIL IS ILLUMINATED
- Perform troubleshooting in accordance with the chart below.
Result
RESULT CHARTCondition Proceed to MIL remains ON A MIL does not illuminated B
B: Go to step 5
A: Go to next step
- Perform troubleshooting in accordance with the chart below.
- CLEAR WHETHER MIL TURNS OFF
- Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
- Turn the engine switch on (IG) and turn the tester ON.
- Read the DTC.
- Clear the DTC.
- Check that the MIL is not illuminated.
OK:
MIL is not illuminated.
OK: REPAIR CIRCUIT INDICATED BY OUTPUT DTC
NG: Go to next step
- CHECK WIRE HARNESS (CHECK FOR SHORT IN WIRE HARNESS)
- Disconnect the A7 ECM connector.
- Turn the engine switch on (IG).
- Check that the MIL is not illuminated.
OK:
MIL is not illuminated.
OK: REPLACE ECM
NG: Go to next step
- CHECK WIRE HARNESS (COMBINATION METER - ECM)
- Disconnect the K31 combination meter connector.
- Disconnect the A7 ECM connector.
- Measure the resistance of the wire harness side connectors.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITIONTester Connection Specified Condition K31-8 - A7-8 (W) Below 1 Ω K31-8 or A7-8 (W) - Body ground 10 kΩ or higher
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: REPAIR OR REPLACE COMBINATION METER
- CHECK THAT MIL IS ILLUMINATED
- Check that the MIL is illuminated when turning the engine switch on (IG).
OK:
MIL is illuminated.
OK: SYSTEM OK
NG: Go to next step
- Check that the MIL is illuminated when turning the engine switch on (IG).
- CHECK ENGINE START
- Start the engine.
RESULT CHARTResult Proceed to Engine starts A Engine does not start* B HINT:
*: The intelligent tester cannot communicate with the ECM.
B: GO TO VC OUTPUT CIRCUIT
A: Go to next step
- CHECK WIRE HARNESS (COMBINATION METER - BODY GROUND)
- Disconnect the A7 ECM connector.
- Turn the engine switch on (IG).
- Measure the voltage of the wire harness side connector.
Standard voltage
TESTER CONNECTION SPECIFIED CONDITIONTester Connection Specified Condition A7-8 (W) - Body ground 10 to 14 V
OK: REPLACE ECM
NG: Go to next step
- CHECK WIRE HARNESS (COMBINATION METER - ECM)
- Disconnect the K31 combination meter connector.
- Disconnect the A7 ECM connector.
- Measure the resistance of the wire harness side connectors.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITIONTester Connection Specified Condition K31-8 - A7-8 (W) Below 1 Ω K31-8 or A7-8 (W) - Body ground 10 kΩ or higher
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: REPAIR OR REPLACE COMBINATION METER
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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