Mitsubishi Colt Ralliart. Manual — part 530

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-28

DIAGNOSIS PROCEDURE

Step 1. Connector check: A-130 A/C compressor
connector and A-08 engine-CVT-ECU

AC313811

Connector: A-08

AL

Harness side

A-08 (B)

AC313797

Connector: A-130

AB

Harness side

A-130 (B)

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the connector.

Step 2. Voltage measurement at A-130 A/C
compressor connector.

AC313797

Connector: A-130

AB

Harness side

A-130 (B)

(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Turn the ignition switch to the "ON" position.

AC313811

Connector: A-08

AL

Harness side

A-08 (B)

AC309471

AC309471

Connector A-08
(Harness side)

AL

(3) Disconnect engine-CVT-ECU connector A-08

and earth terminal 6.

AC310507

Connector A-130
(Harness side)

EY

(4) Voltage between terminal 1 and body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Go to Step 3.

Main

Index

Group

TOC

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-29

Step 3. Connector check: B-104 A/C compressor
relay connector

AC313824

Connector: B-104

AF

Junction block side

Junction block (Front view)

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the connector.

Step 4. Check the A/C compressor relay
continuity.
Refer to

P.55A-52

.

Q: Is the A/C compressor relay in good condition?

YES :

Go to Step 5.

NO :

Replace the A/C compressor relay.

Step 5. Voltage measurement at B-104 A/C
compressor relay connector.

AC313824

Connector: B-104

AF

Junction block side

Junction block (Front view)

(1) Remove the relay, and measure at the junction

block side.

(2) Turn the ignition switch to the "ON" position.

AC310507

Connector B-104
(Junction block side)

EZ

(3) Voltage between terminal 1 and body earth.

OK: System voltage

AC310507

Connector B-104
(Junction block side)

FA

(4) Voltage between terminal 3 and body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Go to Step 6.

Main

Index

Group

TOC

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-30

Step 6. Check the wiring harness between B-104
A/C compressor relay connector terminal No.1, 3
and the fusible link (6).

AC313825

Connectors: B-104, B-108

AF

Junction block side

Junction block (Front view)

B-104

B-108 (B)

B-104

Harness side

B-108

NOTE: Prior to the wiring harness inspection, check
junction block connectors C-108, and repair if neces-
sary.

• Check the A/C compressor relay power supply

line for open circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction

P.00-13

).

NO :

Repair the wiring harness.

Step 7. Check the wiring harness between B-104
A/C compressor relay connector terminal No.4
and A-130 A/C compressor connector terminal
No.1.

AC313797

Connector: A-130

AB

Harness side

A-130 (B)

AC313825

Connectors: B-104, B-112

AJ

B-112

B-112

B-104

Harness side

Junction block (Front view)

Junction block side

B-104

NOTE:

AC313811 AG

Connector: A-17

A-17 (B)

Prior to the wiring harness inspection, check interme-
diate connector A-17 and junction block connector
B-112, and repair if necessary.

• Check the A/C compressor relay power supply

line for open circuit.

Main

Index

Group

TOC

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-31

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Repair the wiring harness.

Step 8. Check the wiring harness between B-104
A/C compressor relay connector terminal No.2
and A-08 A/C compressor assembly connector
terminal No.6.

AC313811

Connector: A-08

AL

Harness side

A-08 (B)

AC313825

Connectors: B-104, B-110

AK

B-110

B-110

B-104

Harness side

Junction block (Front view)

Junction block side

B-104

NOTE: Prior to the wiring harness inspection, check
junction block connector B-110, and repair if neces-
sary.

• Check the A/C compressor power supply line for

open circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction

P.00-13

).

NO :

Repair the wiring harness.

Step 9. Check the magnetic clutch operation.
Refer to

P.55A-64

.

Q: Can the sound of the magnetic clutch (click) be

heard?
YES :

Go to Step 10.

NO :

Replace the compressor magnet clutch.

Step 10. Check the refrigerant level.
Refer to

P.55A-50

.

Q: Is the refrigerant level correct?

YES :

Go to Step 11.

NO :

Correct the refrigerant level (Refer to

P.55A-48

or

P.55A-48

).

Step 11. Replace the combination meter (meter
and A/C-ECU), and then recheck the trouble
symptom
Check that the compressor works normally.

Q: Is the check result normal?

YES :

This diagnosis is complete.

NO :

Replace the engine-CVT-ECU.

Main

Index

Group

TOC