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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

Harness side

A-08 (B)

AC313797

Connector: A-130

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

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

Harness side

A-08 (B)

AC309471

Connector A-08
(Harness side)

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

and earth terminal 6.

AC310507

Connector A-130
(Harness side)

(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

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

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)

(3) Voltage between terminal 1 and body earth.

OK: System voltage

AC310507

Connector B-104
(Junction block side)

(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

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

Harness side

A-130 (B)

AC313825

Connectors: B-104, 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

Harness side

A-08 (B)

AC313825

Connectors: B-104, 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

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

Content .. 528 529 530 531 ..