Lancer Sportback L4-2.4L (4B12) (2010)
CAN-C Communication Circuit [RALLIART] (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) [Except RALLIART], joint connector (CAN4) [RALLIART], ECM connector or
intermediate connector [RALLIART] improperly connected]
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Malfunction of the wiring harness [open circuit between the ECM connector and the joint connector (CAN3) [Except RALLIART] or the joint
connector (CAN4) [RALLIART], power supply circuit to the ECM]
-
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 [Except RALLIART], joint connector (CAN4) A-55 [RALLIART], ECM connector B-109 and
intermediate connector A-54 [RALLIART] 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 [Except RALLIART], joint connector (CAN4) A-55 [RALLIART], ECM connector B-109 and intermediate
connector A-54 [RALLIART] 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 [Except RALLIART] or joint connector (CAN4) A-55 [RALLIART]
and ECM connector B-109.
CAUTION: Strictly observe the specified wiring harness repair procedure.
1. Disconnect joint connector (CAN3) C-124 [Except RALLIART] or joint connector (CAN4) A-55 [RALLIART] and ECM connector B-109, and