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Home >> Mitsubishi >> 2009 >> Galant L4-2.4L (4G69) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Component Tests and General Diagnostics >> Diagnostic Item 4 >> Part 2

Part 2

STEP 20. Check the CAN_ H line (communication line only) between joint connector (3) and TPMS receiver connector for short to ground. Measure the resistance at joint connector (3) C-02.

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







1. Disconnect joint connector (3) C-02 and TPMS receiver connector C-133, and measure the resistance at the male side of joint connector (3) C-02.
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 intermediate connector terminal 10 and body ground.

OK: 1 kohms or more

Q: Does the resistance measure 1 kohms or more?

YES : If the resistance measures 1 kohms or more, diagnose CAN bus lines thoroughly. Diagnostic Item 14

NO : If the resistance measures less than 1 kohms, repair the wiring harness between joint connector (3) and the TPMS receiver connector.

STEP 21. Check the CAN_H line [communication line including the multi-center display unit (middle-grade type or Mitsubishi Multi Communication System)] between joint connector (3) and multi-center display connector for short to ground. Measure the resistance at joint connector (3) C-02.

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







1. Disconnect joint connector (3) C-02, and measure the resistance at the wiring harness side of joint connector (3) C-02.
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 (3) terminal 8 and body ground.

OK: 1 kohms or more

Q: Does the resistance measure 1 kohms or more?

YES : If the resistance measures 1 kohms or more, go to Step 24.

NO : If the resistance measures less than 1 kohms, go to Step 22.

STEP 22. Check multi-center display unit connector C-05 [middle-grade type] or C-31 [Mitsubishi Multi Communication System].







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

Q: Is multi-center display unit connector C-05 [middle-grade type] or C-31 [Mitsubishi Multi Communication System] in good condition?

YES : Go to Step 23.

NO : Repair the damaged parts.

STEP 23. Check the CAN_H line (communication line only) between joint connector (3) and multi-center display unit connector for short to ground. Measure the resistance at joint connector (3) C-02.

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







1. Disconnect joint connector (3) C-02 and multi-center display unit connector C-05 [middle-grade type] or C-31 [Mitsubishi Multi Communication System], and measure the resistance at the wiring harness side of joint connector (3) C-02.
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 (3) terminal 8 and body ground.

OK: 1 kohms or more

CAUTION: Strictly observe the specified wiring harness repair procedure.

Q: Does the resistance measure 1 kohms or more?

YES : If the resistance measures 1 kohms or more, diagnose CAN bus lines thoroughly. Diagnostic Item 16

NO : If the resistance measures less than 1 kohms, repair the wiring harness between joint connector (3) and multi-center display unit connector (middle-grade type or Mitsubishi Multi Communication System).

STEP 24. Check the CAN_H line (communication line only) between joint connector (3) and the data link connector for short to ground. Measure the resistance at joint connector (3) C-02.

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







1. Disconnect joint connector (3) C-02, and measure the resistance at the wiring harness side of joint connector (3) C-02.
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 (3) terminal 7 and body ground.

OK: 1 kohms or more

CAUTION: Strictly observe the specified wiring harness repair procedure.

Q: Does the resistance measure 1 kohms or more?

YES : If the resistance measures 1 kohms or more, go to Step 25.

NO : If the resistance measures less than 1 kohms, repair the wiring harness between joint connector (3) and the data link connector.

STEP 25. Check the CAN_H line (communication line only) between intermediate connector C-29 and joint connector (3) for short to ground. Measure the resistance at joint connector (3) C-02.

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







1. Disconnect intermediate connector C-29 and joint connector (3) C-02, and measure the resistance at the wiring harness side of joint connector (3) C-02.
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 (3) terminal 9 and body ground.

OK: 1 kohms or more

CAUTION: Strictly observe the specified wiring harness repair procedure.

Q: Does the resistance measure 1 kohms or more?

YES : If the resistance measures 1 kohms or more, diagnose CAN bus lines thoroughly. Diagnostic Item 16

NO : If the resistance measures less than 1 kohms, repair the wiring harness between intermediate connector C-29 and joint connector (3).

STEP 26. Check ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] connector A-02 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: Is ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] connector A-02 in good condition?

YES : Go to Step 27.

NO : Repair the damaged parts.

STEP 27. Check the CAN_H line (communication line only) between intermediate connector C-29 and ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] connector for short to ground. Measure the resistance at intermediate connector C-29.

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







1. Disconnect intermediate connector C-29 and ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] connector A-02, and measure the resistance at the male side of intermediate connector C-29 (at front wiring harness side).
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 intermediate connector terminal 11 and body ground.

OK: 1 kohms or more

CAUTION: Strictly observe the specified wiring harness repair procedure.

Q: Does the resistance measure 1 kohms or more?

YES : If the resistance measures 1 kohms or more, go to Step 28.

NO : If the resistance measures less than 1 kohms, repair the wiring harness between intermediate connector C-29 and ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] connector.

STEP 28. Check the CAN_H line (communication line only) between the powertrain control module connector and ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] connector for short to ground. Measure the resistance at powertrain control module connector B-19.

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







1. Disconnect powertrain control module connector B-19 and ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] connector A-02, and measure the resistance at the harness side of powertrain control module connector B-19.
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 powertrain control module connector terminal 17 and body ground.

OK: 1 kohms or more

CAUTION: Strictly observe the specified wiring harness repair procedure.

Q: Does the resistance measure 1 kohms or more?

YES : If the resistance measures 1 kohms or more, go to Step 29.

NO : If the resistance measures less than 1 kohms, repair the wiring harness between powertrain control module connector and ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] connector.

STEP 29. Check the CAN_H line inside the ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] for short to ground. Measure the resistance at ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] connector A-02.

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







1. Disconnect ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] connector A-02.







2. Connect special tool MB991970 (ABS check harness) to the ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL] and the wiring harness, and measure the resistance at special tool MB991970 (ABS check harness).
3. Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION: Disconnect the negative battery terminal.

4. Disconnect the negative battery terminal.
5. Measure the resistance between special tool MB991970 (ABS check harness) connector terminal 25 and body ground.

OK: 1 kohms or more

Q: Does the resistance measure 1 kohms or more?

YES : If the resistance measures 1 kohms or more, diagnose CAN bus lines thoroughly. Diagnostic Item 16

NO : If the resistance measures less than 1 kohms, replace the ABS-ECU [vehicles without TCL] or ABS/TCL-ECU [vehicles with TCL].

STEP 30. Check intermediate connector C-29 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: Is intermediate connector C-29 in good condition?

YES : Go to Step 31.

NO : Repair the damaged parts.

STEP 31. Check the CAN_L-side bus line (communication line including ECUs) of the front wiring harness for short to ground. Measure the resistance at intermediate connector C-29.

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







1. Disconnect intermediate connector C-29, and measure the resistance at the male side (at front wiring harness side).
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 intermediate connector terminal 12 and body ground.

OK: 1 kohms or more

Q: Does the resistance measure 1 kohms or more?

YES : If the resistance measures 1 kohms or more, go to Step 32.

NO : If the resistance measures less than 1 kohms, go to Step 52.
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