Lancer Sportback L4-2.4L (4B12) (2010)
CAN-B Communication Circuit (Part 2)
FUNCTION
If the scan tool MB991958 cannot communicate with the A/C-ECU, this diagnosis result will be set.
TROUBLE JUDGMENT CONDITIONS
If a communication flag is not set for the A/C-ECU, the ETACS-ECU determines that there is a failure.
TROUBLESHOOTING HINTS
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Malfunction of the connector [joint connector (CAN1), A/C-ECU connector improperly connected]
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Malfunction of the wiring harness [open circuit between the A/C-ECU connector and the joint connector (CAN1), power supply circuit to the
A/C-ECU]
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Malfunction of the A/C-ECU
DIAGNOSIS
Required Special Tools:
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MB991223: Harness Set
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MB992006: Extra Fine Probe
STEP 1. Check joint connector (CAN1) C-06 and A/C-ECU connector C-20 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 (CAN1) C-06 and A/C-ECU connector C-20 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
STEP 2. Check the wiring harness between joint connector (CAN1) C-06 and A/C-ECU connector C-20 for open circuit.
CAUTION: Strictly observe the specified wiring harness repair procedure.
1. Disconnect joint connector (CAN1) C-06 and A/C-ECU connector C-20, and check the wiring harness.