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Home >> Mitsubishi >> 2010 >> Lancer L4-2.0L (4B11) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Component Tests and General Diagnostics >> CAN Bus Diagnostics >> Diagnostic Item 26 >> Part 2

Part 2

STEP 13. Check the wiring harness between joint connector (CAN1) C-06 and combination meter connector C-04 for a short to power supply. Measure the voltage at joint connector (CAN1) C-06.

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







1. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).
2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN1) terminal 3 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN1) terminal 14 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES (vehicles with KOS): Go to Step 14.
YES (vehicles with WCM): Go to Step 15.

NO (vehicles with KOS and WCM): Go to Step 24.

STEP 14. Check the wiring harness between joint connector (CAN1) C-06 and KOS-ECU connector C-31 for a short to power supply. Measure the voltage at joint connector (CAN1) C-06.

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







1. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).
2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN1) terminal 9 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN1) terminal 22 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES: Go to Step 16.

NO: Go to Step 25.

STEP 15. Check the wiring harness between joint connector (CAN1) C-06 and WCM connector C-09 for a short to power supply. Measure the voltage at joint connector (CAN1) C-06.

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







1. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).
2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN1) terminal 5 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN1) terminal 16 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES: Go to Step 16.

NO: Go to Step 26.

STEP 16. Check the wiring harness between joint connector (CAN1) C-06 and SRS-ECU connector C-122 for a short to power supply. Measure the voltage at joint connector (CAN1) C-06.

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







1. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).
2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN1) terminal 8 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN1) terminal 21 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES: Go to Step 17.

NO: Go to Step 27.

STEP 17. Check the wiring harness between joint connector (CAN1) C-06 and occupant classification-ECU connector D-35-2 for a short to power supply. Measure the voltage at joint connector (CAN1) C-06.

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







1. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).
2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN1) terminal 11 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN1) terminal 24 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES (vehicles without hands free system): Go to Step 19.
YES (vehicles with hands free system): Go to Step 18.

NO: Go to Step 28.

STEP 18. Check the wiring harness between joint connector (CAN1) C-06 and hands free module connector C-110 for a short to power supply. Measure the voltage at joint connector (CAN1) C-06.

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







1. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).
2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN1) terminal 10 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN1) terminal 23 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES: Go to Step 19.

NO: Go to Step 29.

STEP 19. Check the wiring harness between joint connector (CAN1) C-06 and A/C-ECU connector C-20 [vehicles with A/C] or heater control unit connector C-48 [vehicles without A/C] for a short to power supply. Measure the voltage at joint connector (CAN1) C-06.

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







1. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).
2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN1) terminal 1 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN1) terminal 12 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES (vehicles without MMCS): Go to Step 20.
YES (vehicles with MMCS): Go to Step 21.

NO: Go to Step 30.

STEP 20. Check the wiring harness between joint connector (CAN1) C-06 and radio and CD player connector C-104 for a short to power supply. Measure the voltage at joint connector (CAN1) C-06.

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







1. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).
2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN1) terminal 7 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN1) terminal 20 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES (vehicles without satellite radio): Go to Step 23.
YES (vehicles with satellite radio): Go to Step 22.

NO: Go to Step 31.

STEP 21. Check the wiring harness between joint connector (CAN1) C-06 and CAN box unit connector C-108 for a short to power supply. Measure the voltage at joint connector (CAN1) C-06.

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







1. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).
2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN1) terminal 7 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN1) terminal 20 and body ground.

OK: 4.7 volts or less

Q: all the voltages measure 4.7 volts or less?

YES (vehicles without satellite radio): Go to Step 23.
YES (vehicles with satellite radio): Go to Step 22.

NO: Go to Step 32.

STEP 22. Check the wiring harness between joint connector (CAN1) C-06 and satellite radio tuner connector C-17 for a short to power supply. Measure the voltage at joint connector (CAN1) C-06.

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







1. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).
2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN1) terminal 2 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN1) terminal 13 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES: Go to Step 23.

NO: Go to Step 33.

STEP 23. Check the wiring harness between joint connector (CAN1) C-06 and ETACS-ECU connector C-301 for a short to power supply. Measure the voltage at joint connector (CAN1) C-06.

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







1. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).
2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN1) terminal 6 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN1) terminal 19 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES: Go to Step 34.

NO: Repair the wiring harness between joint connector (CAN1) C-06 and ETACS-ECU connector C-301.

STEP 24. Using scan tool MB991958, diagnose the CAN bus line. (checking the combination meter for internal failure)

CAUTION:
- Strictly observe the specified wiring harness repair procedure.
- To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.







1. Disconnect combination meter connector C-04.
2. Connect scan tool MB991958 to the data link connector.
3. Turn the ignition switch to the "ON" position.







4. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as shown in the figure.







Q: Does scan tool MB991958 screen correspond to the illustration?

YES: Repair the wiring harness between joint connector (CAN1) C-06 and combination meter connector C-04.

NO: Check combination meter connector C-04, and repair if necessary. If the combination meter connector is in good condition, replace the combination meter.
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