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Home >> Mitsubishi >> 2010 >> Endeavor 2WD V6-3.8L (6G75) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Component Tests and General Diagnostics >> CAN Bus Diagnostics >> Diagnostic Item 15
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Diagnostic Item 15

DIAGNOSTIC ITEM 15: Diagnose the lines between CAN main bus line and the A/C-ECU

CAUTION: When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.

(Part 1):




(Part 2):






TROUBLE JUDGMENT
If the M.U.T.-III cannot received signals from the A/C-ECU, CAN bus line connector(s) are broken or an open circuit has occurred.

COMMENTS ON TROUBLE SYMPTOM
The wiring harness wire or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector, or the A/C-ECU may be defective.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector
- The A/C-ECU may be defective

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check joint connector (4) C-101 and A/C-ECU connector C-42 [manual air conditioning system] or A/C-ECU connector C-16 [automatic air conditioning system] for loose, corroded or damaged terminals, or terminals pushed back in the connector.









NOTE: For the removal of the joint connector.

CAUTION: The strand end of the twist wire should be within 10 cm (4 inches) from the connector.






Check the joint connector at the wiring harness side for loose, corroded or damaged terminals, or terminals pushed back in the connector, and also check the short pin behind the connector for corrosion, deformation and delamination.

Q: Are joint connector (4) C-101 and A/C-ECU connector C-42 [manual air conditioning system] or A/C-ECU connector C-16 [automatic air conditioning system] in good condition?

YES : Go to Step 2.

NO : Repair the damaged parts. Replace the joint connector as necessary.

STEP 2. Check the CAN bus lines between joint connector (4) and the A/C-ECU. Measure the resistance between joint connector (4) C-101 and A/C-ECU connector C-42 [manual air conditioning system] or A/C-ECU connector C-16 [automatic air conditioning system].

CAUTION:
- A digital multimeter should be used.
- The test wiring harness should be used.









1. Disconnect joint connector (4) C-101 and A/C-ECU connector C-42 [manual air conditioning system] or A/C-ECU connector C-16 [automatic air conditioning system], and measure the resistances at the wiring harness sides of joint connector (4) C-101 and A/C-ECU connector C-42 [manual air conditioning system] or A/C-ECU connector C-16 [automatic air conditioning system ].
2. Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION: Disconnect the negative battery terminal.

3. Disconnect the negative battery terminal.






4. Measure the resistance between joint connector (4) terminal 7 and A/C-ECU connector C-42 [manual air conditioning system] terminal 6.

OK: 2 ohms or less






5. Measure the resistance between joint connector (4) terminal 18 and A/C-ECU connector C-42 [manual air conditioning system] terminal 5.

OK: 2 ohms or less

CAUTION: Strictly observe the specified wiring harness repair procedure.






6. Measure the resistance between joint connector (4) terminal 7 and A/C-ECU connector C-16 [automatic air conditioning system] terminal 14.

OK: 2 ohms or less






7. Measure the resistance between joint connector (4) terminal 18 and A/C-ECU connector C-16 [automatic air conditioning system] terminal 15.

OK: 2 ohms or less

CAUTION: Strictly observe the specified wiring harness repair procedure.

Q: Do all the resistances measure 2 ohms or less?

YES : [All the resistances measure 2 ohms or less] Power supply to the A/C-ECU may be suspected. Diagnose the air conditioning system. Refer to Manual A/C diagnosis. Inspection Procedure 10

NO : [If either of the resistances measures more than 2 ohms or all the resistances measure more than 2 ohms] Repair the wiring harness between joint connector (4) and the A/C-ECU connector.
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