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).