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HOMESERVICE MANUALSMITSUBISHI2005LANCER L4-2.0L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESINSPECTION PROCEDURE 2
2005 Mitsubishi Lancer L4-2.0L SOHC

Inspection Procedure 2

2005 Mitsubishi Lancer L4-2.0L SOHCSECTION Inspection Procedure 2
Communication with Scan Tool Is Not Possible (Communication with ECM or PCM Only Is Not Possible)

Data Link Connector Circuit Part 1:




Data Link Connector Circuit Part 2:






CIRCUIT OPERATION
- A diagnostic output is made from the ECM (terminal No.62) or PCM (terminal No.85) to the diagnostic output terminal (terminal No.7) of the data link connector.

COMMENT
- No power supply to ECM or PCM .
- Defective ground circuit of ECM or PCM .
- Defective ECM or PCM .
- Improper communication line between ECM or PCM and scan tool.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Malfunction of ECM or PCM power supply circuit.
- Malfunction of the ECM or PCM .
- Open circuit between ECM or PCM and data link connector.

DIAGNOSIS







STEP 1. Check harness connector C-117 at ECM or harness connector C-116 at PCM for damage.

Q: Is the harness connector in good condition?

YES : Go to Step 2.

NO : Repair or replace it. Refer to Harness Connector Inspection. Then confirm that the malfunction symptom is eliminated.










STEP 2. Check for open circuit, short circuit to ground and harness damage between data link connector C-14 (terminal No.7) and ECM connector C-117 (terminal No.62) or PCM connector C-116 (terminal No.85) .

NOTE: Check harness after checking intermediate connectors C-101 and C-124. If intermediate connectors are damaged, repair or replace them. Refer to Harness Connector Inspection. Then check that the malfunction is eliminated.

Q: Is the harness wire in good condition?

YES : Refer to, INSPECTION PROCEDURE 29 - Power Supply System and Ignition Switch - IG System.

NO : Repair it. Then confirm that the malfunction symptom is eliminated.
RENDER: 1.0x

NO RELATED

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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.