Mitsubishi Lancer (4A9 engine). Manual — part 226

ETACS

CHASSIS ELECTRICAL

54A-566

Inspection Procedure 8: The rear door switch (LH) signal is not received.

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communica-
tion circuit are normal.

COMMENTS ON TROUBLE SYMPTOM
If there is an error to the rear door switch (LH) input
signal, the rear door switch (LH) signal is no longer
output to the communication line.

PROBABLE CAUSES

• Malfunction of rear door switch (LH)

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

ETACS-
ECU

REAR DOOR
SWITCH (LH)

Rear Door Switch (LH) Input Circuit

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple

AC701240

AU

Connector: C-313 <LHD>
ETACS-ECU

C-313 (BR)

AC701241

BA

Connector: C-313 <RHD>
ETACS-ECU

C-313 (BR)

AC801769 AK

Connector: D-18

ETACS

CHASSIS ELECTRICAL

54A-567

DIAGNOSIS PROCEDURE

STEP 1. Check the installation condition.
Check that the rear door switch (LH) is installed to
the body correctly.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Correct the installation condition.

STEP 2. Connector check: D-18 rear door switch
(LH) connector

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the defective connector.

STEP 3. Rear door switch (LH) check
Refer to GROUP 42A

− Door .

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Replace the rear door switch (LH).

STEP 4. Connector check: C-313 ETACS-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair the defective connector.

STEP 5. Wiring harness check between the D-18
rear door switch (LH) connector terminal No. 3
and the C-313 ETACS-ECU connector terminal
No. 7
Check the input lines for open circuit and short cir-
cuit.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the wiring harness.

STEP 6. M.U.T.-III data list
Open the rear left door.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00

− How to

use Troubleshooting/inspection Service
Points

− How to Cope with Intermittent

Malfunction ).

NO :

Replace the ETACS-ECU.

Item No.

Item name

Normal
condition

Item 259

RL door ajar switch

Open

ETACS

CHASSIS ELECTRICAL

54A-568

Inspection Procedure 9: The trunk lid latch signal is not received. <LANCER>

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communica-
tion circuit are normal.

ETACS-ECU

TRUNK LID
LATCH

Trunk Lid Latch Input Circuit

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver

AC701240

AU

Connector: C-313 <LHD>
ETACS-ECU

C-313 (BR)

AC701241

BA

Connector: C-313 <RHD>
ETACS-ECU

C-313 (BR)

ETACS

CHASSIS ELECTRICAL

54A-569

COMMENTS ON TROUBLE SYMPTOM
If there is an error to the trunk lid latch input signal,
the trunk lid latch signal is no longer output to the
communication line.

PROBABLE CAUSES

• Malfunction of trunk lid latch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: F-14 trunk lid latch
connector

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the defective connector.

STEP 2. trunk lid latch check
Refer to GROUP 42A

− Trunk lid .

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Replace the trunk lid latch.

STEP 3. Resistance measurement at the F-14
trunk lid latch connector
(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Measure the resistance between the F-14 trunk

lid latch connector terminal No. 2 and the body
earth.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 4.

STEP 4. Wiring harness check from F-14 trunk lid
latch connector terminal No. 2 to body earth
NOTE: Prior to the wiring harness inspection, check
intermediate connector F-28, and repair if necessary.
Check the earth wires for open circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00

− How to

use Troubleshooting/inspection Service
Points

− How to Cope with Intermittent

Malfunction ).

NO :

Repair the wiring harness.

STEP 5. Connector check: C-313 ETACS-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the defective connector.

STEP 6. Wiring harness check between the F-14
trunk lid latch connector terminal No. 1 and the
C-313 ETACS-ECU connector terminal No. 5
NOTE: Prior to the wiring harness inspection, check
intermediate connectors D-17 and F-28, and repair if
necessary.
Check the input lines for open circuit and short cir-
cuit.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the wiring harness.

STEP 7. M.U.T.-III data list
Open the trunk.

OK: Normal condition is displayed.

Q: Is the check result normal?

AC612723

AZ

Connector: D-17

AC701264 AE

Connectors: F-14, F-28

F-28

F-14

Item No.

Item name

Normal
conditio
n

Item 260

Trunk/gate trunk ajar
switch

Open