Lancer L4-2.0L (4B11) (2008)
CAN Communication Circuit (Part 2)
FUNCTION
If the scan tool MB991958 cannot communicate with the ECM, this diagnosis result will be set.
TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the ECM, the ETACS-ECU determines that there is a failure.
TROUBLESHOOTING HINTS
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Malfunction of the connector [joint connector (CAN3) or ECM connector improperly connected]
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Malfunction of the wiring harness [open circuit between the ECM and the joint connector (CAN3), power supply circuit to the ECM]
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Malfunction of the ECM
DIAGNOSIS
Required Special Tools:
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MB991223: Harness Set
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MB992006: Extra Fine Probe
STEP 1. Check joint connector (CAN3) C-124 and ECM connector B-109 for loose, corroded or damaged terminals, or terminals pushed back
in the connector.
CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector.
Q: Are joint connector (CAN3) C-124 and ECM connector B-109 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
STEP 2. Check the wiring harness between joint connector (CAN3) C-124 and ECM connector B-109.
CAUTION: Strictly observe the specified wiring harness repair procedure.
1. Disconnect joint connector (CAN3) C-124 and ECM connector B-109, and check the wiring harness.
2. Check the wiring harness between joint connector (CAN3) C-124 (terminal 4) and ECM connector B-109 (terminal 90)
3. Check the wiring harness between joint connector (CAN3) C-124 (terminal 15) and ECM connector B-109 (terminal 91)
Q: Is the wiring harness between joint connector (CAN3) C-124 and ECM connector B-109 in good condition?