FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
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 5 >> Part 1

Part 1

DIAGNOSTIC ITEM 5: Diagnose shorts in the power supply to CAN-C bus line.


CAN-C Communication Circuit [Except Ralliart]:




CAN-C Communication Circuit [Ralliart] (Part 1):




CAN-C Communication Circuit [Ralliart] (Part 2):






FUNCTION
If a short to power supply is present in the CAN-C lines, this diagnosis result will be set.

TROUBLE JUDGEMENT CONDITIONS
The wiring harness wire or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector, or an ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the connector (short to power supply in connector)
- Malfunction of the wiring harness (short to power supply in the CAN-C main or sub bus lines)
- Malfunction of the ECU (ETACS-ECU, or ECUs on CAN-C lines failed)

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

- MB991997: ASC Check Harness
- MB992110: Power Plant ECU Check Harness


STEP 1. Check the wiring harness between joint connector (CAN2) C-05 and steering wheel sensor connector C-211 for a short to power supply. Measure the voltage at joint connector (CAN2) C-05.
1. Disconnect joint connector (CAN2), and measure the voltage at the wiring harness side of joint connector (CAN2).







2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN2) terminal 7 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN2) terminal 20 and body ground.

4.7 volts or less

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

YES [except RALLIART]: Go to Step 3.
YES [RALLIART]: Go to Step 2.

NO: Go to Step 11.

STEP 2. Check the wiring harness between joint connector (CAN2) C-05 and AWC-ECU connector C-51 for a short to power supply. Measure the voltage at joint connector (CAN2) C-05.
1. Disconnect joint connector (CAN2), and measure the voltage at the wiring harness side of joint connector (CAN2).







2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN2) terminal 4 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN2) terminal 15 and body ground.

OK: 4.7 volts or less

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

YES: Go to Step 3.

NO: Go to Step 12.

STEP 3. Check the wiring harness between joint connector (CAN2) C-05 and ETACS-ECU connector C-301 for a short to power supply. Measure the voltage at joint connector (CAN2) C-05.
1. Disconnect joint connector (CAN2), and measure the voltage at the wiring harness side of joint connector (CAN2).







2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN2) terminal 6 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN2) 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 4.

NO: Go to Step 13.

STEP 4. Check the wiring harness between joint connector (CAN3) C-124 and ASC-ECU connector A-51 for a short to power supply. Measure the voltage at joint connector (CAN3) C-124.
1. Disconnect joint connector (CAN3), and measure the voltage at the wiring harness side of joint connector (CAN3).







2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN3) terminal 6 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN3) terminal 19 and body ground.

OK: 4.7 volts or less

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

YES [except RALLIART]: Go to Step 5.
YES [RALLIART]: Go to Step 7.

NO: Go to Step 14.

STEP 5. Check the wiring harness between joint connector (CAN3) C-124 and TCM connector C-41 for a short to power supply. Measure the voltage at joint connector (CAN3) C-124.
1. Disconnect joint connector (CAN3), and measure the voltage at the wiring harness side of joint connector (CAN3).







2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN3) terminal 7 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN3) terminal 20 and body ground.

OK: 4.7 volts or less

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

YES: Go to Step 6.

NO: Go to Step 15.

STEP 6. Check the wiring harness between joint connector (CAN3) C-124 and ECM connector B-109 [except RALLIART] for a short to power supply. Measure the voltage at joint connector (CAN3) C-124.
1. Disconnect joint connector (CAN3), and measure the voltage at the wiring harness side of joint connector (CAN3).







2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN3) terminal 4 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN3) terminal 15 and body ground.

OK: 4.7 volts or less

Q: all the voltages measure 4.7 volts or less?

YES: Check intermediate connector C-128, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN2) C-05 and joint connector (CAN3) C-124.

NO: Go to Step 16.

STEP 7. Check the wiring harness between joint connector (CAN3) C-124 and shift lever connector C-49 for a short to power supply. Measure the voltage at joint connector (CAN3) C-124.
1. Disconnect joint connector (CAN3), and measure the voltage at the wiring harness side of joint connector (CAN3).







2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN3) terminal 7 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN3) terminal 20 and body ground.

OK: 4.7 volts or less

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

YES: Go to Step 8.

NO: Go to Step 17.

STEP 8. Check the wiring harness between joint connector (CAN4) A-55 and ECM connector B-109 [RALLIART] for a short to power supply. Measure the voltage at joint connector (CAN4) A-55.
1. Disconnect joint connector (CAN4), and measure the voltage at the wiring harness side of joint connector (CAN4).







2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN4) terminal 6 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN4) 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 9.

NO: Go to Step 16.

STEP 9. Check the wiring harness between joint connector (CAN4) A-55 and transaxle assembly (TC-SST-ECU) connector B-120 for a short to power supply. Measure the voltage at joint connector (CAN4) A-55.
1. Disconnect joint connector (CAN4), and measure the voltage at the wiring harness side of joint connector (CAN4).







2. Turn the ignition switch to the ON position.
3. Measure the voltage between joint connector (CAN4) terminal 7 and body ground.

OK: 4.7 volts or less







4. Measure the voltage between joint connector (CAN4) terminal 20 and body ground.

OK: 4.7 volts or less

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

YES: Go to Step 10.

NO: Go to Step 18.
pro multis Credits:Operation CHARM About Operation CHARM