Mitsubishi Lancer (4A9 engine). Manual - part 277

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-132

STEP 16. Check the wiring harness between C-23 
KOS-ECU connector and C-04 joint connector 
(CAN1) for short to power supply (voltage 
measurement).

CAUTION

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and measure 

at the wiring harness side.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint 

connector (CAN1) terminal No.5 and body earth. 
<CAN_H>

OK: 5 V or less

(4) Measure the voltage between C-04 joint 

connector (CAN1) terminal No.16 and body 
earth. <CAN_L>

OK: 5 V or less

Q: Is the check result normal?

YES <vehicles with radio and CD player> : 

Go to 

Step 17.

YES <vehicles with MMCS (vehicles for Russia)> : 

Go to Step 18.

YES <vehicles without MMCS and without radio 
and CD player> : 

Go to Step 19.

NO (the check result is not normal.) : 

Go to Step 

44.

STEP 17. Check the wiring harness between C-
103 radio and CD player connector and C-04 joint 
connector (CAN1) for short to power supply 
(voltage measurement).

CAUTION

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and measure 

at the wiring harness side.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint 

connector (CAN1) terminal No.6 and body earth. 
<CAN_H>

OK: 5 V or less

(4) Measure the voltage between C-04 joint 

connector (CAN1) terminal No.17 and body 
earth. <CAN_L>

OK: 5 V or less

Q: Is the check result normal?

YES  : 

Go to Step 20.

NO  : 

Go to Step 45.

STEP 18. Check the wiring harness between C-54 
CAN box unit connector and C-04 joint connector 
(CAN1) for short to power supply (voltage 
measurement).

CAUTION

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and measure 

at the wiring harness side.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint 

connector (CAN1) terminal No.6 and body earth. 
<CAN_H>

OK: 5 V or less

(4) Measure the voltage between C-04 joint 

connector (CAN1) terminal No.17 and body 
earth. <CAN_L>

OK: 5 V or less

Q: Is the check result normal?

YES  : 

Go to Step 20.

NO  : 

Go to Step 46.

STEP 19. Check the wiring harness between C-
103 spare connector (for audio) and C-04 joint 
connector (CAN1) for short to power supply 
(voltage measurement).

CAUTION

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and measure 

at the wiring harness side.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint 

connector (CAN1) terminal No.6 and body earth.

OK: 5 V or less

(4) Measure the voltage between C-04 joint 

connector (CAN1) terminal No.17 and body 
earth.

OK: 5 V or less

Q: Is the check result normal?

YES : 

Go to Step 20.

NO : 

Repair the wiring harness between C-103 
spare connector (for audio) and C-04 joint 
connector (CAN1).

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-133

STEP 20. Check the wiring harness between C-
301 ETACS-ECU connector and C-04 joint 
connector (CAN1) for short to power supply 
(voltage measurement).

CAUTION

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

• Strictly observe the specified wiring harness 

repair procedure. For details refer to .

(1) Disconnect the ETACS-ECU connector and joint 

connector (CAN1), and measure at the wiring 
harness side.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint 

connector (CAN1) terminal No.11 and body earth. 
<CAN_H>

OK: 1 V or less

(4) Measure the voltage between C-04 joint 

connector (CAN1) terminal No.22 and body 
earth. <CAN_L>

OK: 1 V or less

Q: Is the check result normal?

YES : 

Go to Step 47.

NO : 

Repair the wiring harness between C-301 
ETACS-ECU connector and C-04 joint 
connector (CAN1).

STEP 21. Checking line-to-line short

CAUTION

• Disconnect the negative battery terminal. For 

details refer to .

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect C-301 ETACS-ECU connector, and 

check that there is continuity at the harness side.

(2) Check that there is continuity between C-301 

ETACS-ECU connector terminal Nos.6 and 7.

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 31.

NO : 

Go to Step 22.

STEP 22. Check the wiring harness between C-
122 SRS connector and C-04 joint connector 
(CAN1) for line-to-line short.

CAUTION

• Disconnect the negative battery terminal. For 

details refer to .

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and check 

that there is continuity at the harness side.

(2) Check that there is continuity between C-04 joint 

connector terminal No.10 and 21.

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 23.

NO : 

Go to Step 40.

STEP 23. Check the wiring harness between C-60 
heater control unit connector <vehicles without 
A/C> or C-15 A/C-ECU connector <vehicles with 
A/C> and C-04 joint connector (CAN1) for line-to-
line short.

CAUTION

• Disconnect the negative battery terminal. For 

details refer to .

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and check 

that there is continuity at the harness side.

(2) Check that there is continuity between C-04 joint 

connector terminal No.8 and 19.

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 24.

NO  : 

Go to Step 41.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-134

STEP 24. Check the wiring harness between C-01 
combination meter connector and C-04 joint 
connector (CAN1) for line-to-line short.

CAUTION

• Disconnect the negative battery terminal. For 

details refer to .

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and check 

that there is continuity at the harness side.

(2) Check that there is continuity between C-04 joint 

connector terminal No.9 and 20.

OK: No continuity

Q: Is the check result normal?

YES <vehicles without KOS> : 

Go to Step 25.

YES <vehicles with KOS> : 

Go to Step 26.

NO (the check result is not normal.) : 

Go to Step 

42.

STEP 25. Check the wiring harness between C-06 
WCM connector and C-04 joint connector (CAN1) 
for line-to-line short.

CAUTION

• Disconnect the negative battery terminal. For 

details refer to .

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and check 

that there is continuity at the harness side.

(2) Check that there is continuity between C-04 joint 

connector terminal No.7 and 18.

OK: No continuity

Q: Is the check result normal?

YES <vehicles with radio and CD player> : 

Go to 

Step 27.

YES <vehicles with MMCS (vehicles for Russia)> : 

Go to Step 28.

YES <vehicles without MMCS and without radio 
and CD player> : 

Go to Step 29.

NO (the check result is not normal.) : 

Go to Step 

43.

STEP 26. Check the wiring harness between C-23 
KOS-ECU connector and C-04 joint connector 
(CAN1) for line-to-line short.

CAUTION

• Disconnect the negative battery terminal. For 

details refer to .

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and check 

that there is continuity at the harness side.

(2) Check that there is continuity between C-04 joint 

connector terminal No. 5 and 16.

OK: No continuity

Q: Is the check result normal?

YES <vehicles with radio and CD player> : 

Go to 

Step 27.

YES <vehicles with MMCS (vehicles for Russia)> : 

Go to Step 28.

YES <vehicles without MMCS and without radio 
and CD player> : 

Go to Step 29.

NO (the check result is not normal.) : 

Go to Step 

44.

STEP 27. Check the wiring harness between C-
103 radio and CD player connector and C-04 joint 
connector (CAN1) for line-to-line short.

CAUTION

• Disconnect the negative battery terminal. For 

details refer to .

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and check 

that there is continuity at the harness side.

(2) Check that there is continuity between C-04 joint 

connector terminal No. 6 and 17.

OK: No continuity

Q: Is the check result normal?

YES  : 

Go to Step 30.

NO : 

Go to Step 45.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-135

STEP 28. Check the wiring harness between C-54 
CAN box unit connector and C-04 joint connector 
(CAN1) for line-to-line short.

CAUTION

• Disconnect the negative battery terminal. For 

details refer to .

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and check 

that there is continuity at the harness side.

(2) Check that there is continuity between C-04 joint 

connector terminal No. 6 and 17.

OK: No continuity

Q: Is the check result normal?

YES  : 

Go to Step 30.

NO  : 

Go to Step 46.

STEP 29. Check the wiring harness between C-
103 spare connector (for audio) and C-04 joint 
connector (CAN1) for line-to-line short.

CAUTION

• Disconnect the negative battery terminal. For 

details refer to .

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN1), and check 

that there is continuity at the harness side.

(2) Check that there is continuity between C-04 joint 

connector terminal No. 6 and 17.

OK: No continuity

Q: Is the check result normal?

YES  : 

Go to Step 30.

NO  : 

Repair the wiring harness between C-103 
spare connector (for audio) and C-04 joint 
connector (CAN1).

STEP 30. Check the wiring harness between C-
301 ETACS-ECU connector and C-04 joint 
connector (CAN1) for line-to-line short.

CAUTION

• Disconnect the negative battery terminal. For 

details refer to .

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

• Strictly observe the specified wiring harness 

repair procedure. For details refer to .

(1) Disconnect joint connector (CAN1), and check 

that there is continuity at the harness side.

(2) Check that there is continuity between C-04 joint 

connector terminal Nos. 11 and 22.

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 47.

NO : 

Repair the wiring harness between C-301 
ETACS-ECU connector and C-04 joint 
connector (CAN1).

STEP 31. Check the wiring harness between C-
122 SRS-ECU connector and C-04 joint 
connector (CAN1) for open circuit.
Disconnect SRS-ECU connector and joint connector 
(CAN1), and check the following wiring harness.
(1) The wiring harness between C-122 SRS-ECU 

connector terminal No.15 and C-04 joint 
connector (CAN1) terminal No.10.

OK: Continuity exists (2 

Ω or less)

(2) The wiring harness between C-122 SRS-ECU 

connector terminal No.16 and C-04 joint 
connector (CAN1) terminal No.21.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 32.

NO : 

Repair the wiring harness between C-122 
SRS-ECU connector and C-04 joint 
connector (CAN1).