Mitsubishi Lancer (4A9 engine). Manual — part 276

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-128

<CAN_H>

OK: 1 k

Ω or more

(3) Measure the resistance between C-301 ETACS-

ECU connector terminal No.7 and body earth.
<CAN_L>

OK: 1 k

Ω or more

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

Go to Step 2.

STEP 2. Check the wiring harness between C-122
SRS connector and C-04 joint connector (CAN1)
for short to earth (resistance measurement).

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 measure

at the wiring harness side.

(2) Measure the resistance between C-04 joint

connector (CAN1) terminal No.10 and body
earth.

OK: 1 k

Ω or more

(3) Measure the resistance between C-04 joint

connector (CAN1) terminal No.21 and body
earth.

OK: 1 k

Ω or more

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Go to Step 40.

STEP 3. 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 short
to earth (resistance measurement).

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 measure

at the wiring harness side.

(2) Measure the resistance between C-04 joint

connector (CAN1) terminal No.8 and body earth.

<CAN_H>

OK: 1 k

Ω or more

(3) Measure the resistance between C-04 joint

connector (CAN1) terminal No.19 and body
earth. <CAN_L>

OK: 1 k

Ω or more

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 41.

STEP 4. Check the wiring harness between C-01
combination meter connector and C-04 joint
connector (CAN1) for short to earth (resistance
measurement).

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 measure

at the wiring harness side.

(2) Measure the resistance between C-04 joint

connector (CAN1) terminal No.9 and body earth.
<CAN_H>

OK: 1 k

Ω or more

(3) Measure the resistance between C-04 joint

connector (CAN1) terminal No.20 and body
earth. <CAN_L>

OK: 1 k

Ω or more

Q: Is the check result normal?

YES <vehicles without KOS> :

Go to Step 5.

YES <vehicles with KOS> :

Go to Step 6.

NO (the check result is not normal.) :

Go to Step

42.

STEP 5. Check the wiring harness between C-06
WCM connector and C-04 joint connector (CAN1)
for short to earth (resistance measurement).

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 measure

at the wiring harness side.

(2) Measure the resistance between C-04 joint

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-129

connector (CAN1) terminal No.7 and body earth.
<CAN_H>

OK: 1 k

Ω or more

(3) Measure the resistance between C-04 joint

connector (CAN1) terminal No.18 and body
earth. <CAN_L>

OK: 1 k

Ω or more

Q: Is the check result normal?

YES <vehicles with radio and CD player> :

Go to

Step 7.

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

Go to Step 8.

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

Go to Step 9.

NO (the check result is not normal.) :

Go to Step

43.

STEP 6. Check the wiring harness between C-23
KOS-ECU connector and C-04 joint connector
(CAN1) for short to earth (resistance
measurement).

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 measure

at the wiring harness side.

(2) Measure the resistance between C-04 joint

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

OK: 1 k

Ω or more

(3) Measure the resistance between C-04 joint

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

OK: 1 k

Ω or more

Q: Is the check result normal?

YES <vehicles with radio and CD player> :

Go to

Step 7.

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

Go to Step 8.

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

Go to Step 9.

NO (the check result is not normal.) :

Go to Step

44.

STEP 7. Check the wiring harness between C-103
radio and CD player connector and C-04 joint
connector (CAN1) for short to earth (resistance
measurement).

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 measure

at the wiring harness side.

(2) Measure the resistance between C-04 joint

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

OK: 1 k

Ω or more

(3) Measure the resistance between C-04 joint

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

OK: 1 k

Ω or more

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Go to Step 45.

STEP 8. Check the wiring harness between C-54
CAN box unit connector and C-04 joint connector
(CAN1) for short to earth (resistance
measurement).

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 measure

at the wiring harness side.

(2) Measure the resistance between C-04 joint

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

OK: 1 k

Ω or more

(3) Measure the resistance between C-04 joint

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

OK: 1 k

Ω or more

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Go to Step 46.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-130

STEP 9. Check the wiring harness between C-103
spare connector (for audio) and C-04 joint
connector (CAN1) for short to earth (resistance
measurement).

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 measure

at the wiring harness side.

(2) Measure the resistance between C-04 joint

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

OK: 1 k

Ω or more

(3) Measure the resistance between C-04 joint

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

OK: 1 k

Ω or more

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

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

STEP 10. Check the wiring harness between C-
301 ETACS-ECU connector and C-04 joint
connector (CAN1) for short to earth (resistance
measurement).

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 ETACS-ECU connector and joint

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

(2) Measure the resistance between C-04 joint

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

OK: 1 k

Ω or more

(3) Measure the resistance between C-04 joint

connector (CAN1) terminal No.22 and body

earth. <CAN_L>

OK: 1 k

Ω or more

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 11. Checking short to power supply
(voltage measurement)
NOTE: This check determines whether there is a
short to power supply in the CAN-B bus line. If a fail-
ure is present in either the CAN_H or CAN_L line,
check the appropriate line only.

CAUTION

• 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

measure at the wiring harness side.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-301 ETACS-

ECU connector terminal No.6 and body earth.
<CAN_H>

OK: 5 V or less

(4) Measure the voltage between C-301 ETACS-

ECU connector terminal No.7 and body earth.
<CAN_L>

OK: 5 V or less

Q: Is the check result normal?

YES :

Go to Step 21.

NO :

Go to Step 12.

STEP 12. Check the wiring harness between C-
122 SRS 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.10 and body

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-131

earth. <CAN_H>

OK: 5 V or less

(4) Measure the voltage between C-04 joint

connector (CAN1) terminal No.21 and body
earth. <CAN_L>

OK: 5 V or less

Q: Is the check result normal?

YES :

Go to Step 13.

NO :

Go to Step 40.

STEP 13. 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 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.8 and body earth.
<CAN_H>

OK: 5 V or less

(4) Measure the voltage between C-04 joint

connector (CAN1) terminal No.19 and body
earth. <CAN_H>

OK: 5 V or less

Q: Is the check result normal?

YES :

Go to Step 14.

NO :

Go to Step 41.

STEP 14. Check the wiring harness between C-01
combination meter 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.9 and body earth.
<CAN_H>

OK: 5 V or less

(4) Measure the voltage between C-04 joint

connector (CAN1) terminal No.20 and body
earth. <CAN_L>

OK: 5 V or less

Q: Is the check result normal?

YES <vehicles without KOS> :

Go to Step 15.

YES <vehicles with KOS> :

Go to Step 16.

NO (the check result is not normal.) :

Go to Step

42.

STEP 15. Check the wiring harness between C-06
WCM 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.7 and body earth.
<CAN_H>

OK: 5 V or less

(4) Measure the voltage between C-04 joint

connector (CAN1) terminal No.18 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

43.