Mitsubishi Colt Ralliart. Manual — part 664
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-17
Step 8. Check the wiring harness between B-116
blower relay connector terminal No.1 and the
ignition switch (IG2).
AC313824
Connector: B-116
AD
Junction block side
Junction block (Front view)
NOTE:
AC313826
Harness side
AE
Connector: B-130
Junction block (Rear view)
Prior to the wiring harness inspection, check junction
block connector B-130, and repair if necessary.
• Check the blower 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
).
NO :
Repair the wiring harness.
Step 9. Voltage measurement at B-116 blower
relay connector.
AC313824
Connector: B-116
AD
Junction block side
Junction block (Front view)
(1) Remove the relay, and measure at the junction
block side.
AC310507 FJ
Connector C-116
(Junction block side)
(2) Voltage between terminal 3 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Go to Step 10.
Step 10. Check the wiring harness between B-116
blower relay connector terminal No.3 and fusible
link (6).
AC313824
Connector: B-116
AD
Junction block side
Junction block (Front view)
NOTE: Prior to the wiring harness inspection, check
junction block connector B-116, and repair if neces-
sary.
• Check the blower 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
NO :
Repair the wiring harness.
Main
Index
Group
TOC
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-18
Step 11. Check the wiring harness between B-116
blower relay connector terminal No.4 and B-10
blower motor connector terminal No.1.
AC313822
Connector: B-10
AK
Harness side
AC313824
Connector: B-116
AD
Junction block side
Junction block (Front view)
NOTE:
AC313826
Harness side
AE
Connector: B-130
Junction block (Rear view)
Prior to the wiring harness inspection, check junction
block connector B-130, and repair if necessary.
• Check the blower relay earth wires for open cir-
cuit.
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Repair the wiring harness.
Step 12. Check the wiring harness between B-116
blower relay connector terminal No.2 and B-15
combination meter connector terminal No.12.
AC313822 AB
Connector: B-15
Harness side
B-15 (B)
AC313824
Connector: B-116
AD
Junction block side
Junction block (Front view)
NOTE:
AC313826 AF
Connector: B-131
Junction Block (Rear view)
Harness side
Prior to the wiring harness inspection, check junction
block connector B-131, and repair if necessary.
• Check the blower 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
NO :
Repair the wiring harness.
Step 13. Check the blower motor
Refer to GROUP 55A
Q: Is the check result normal?
YES :
Go to Step 14.
NO :
Replace the outside/inside air selection
damper control motor.
Main
Index
Group
TOC
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-19
Step 14. Connector check: B-05 power transistor
controller connector
AC313820AL
Connector: B-05
Harness side
B-05 (B)
Q: Is the check result normal?
YES :
Go to Step 15.
NO :
Repair the connector.
Step 15. Resistance measurement at the B-05
power transistor connector.
AC313820AL
Connector: B-05
Harness side
B-05 (B)
(1) Disconnect the connector, and measure at the
wiring harness side.
AC310506 EJ
Connector B-05
(Harness side)
(2) Continuity between terminal 5 and body earth
OK: Continuity (Less than 2
Ω)
Q: Is the check result normal?
YES :
Go to Step 17.
NO :
Go to Step 16.
Step 16. Check the wiring harness between B-05
power transistor connector terminal No.5 and
body earth.
AC313820AL
Connector: B-05
Harness side
B-05 (B)
• Check the blower linear controller earth 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
NO :
Repair the wiring harness.
Step 17. Check the wiring harness between B-10
blower motor connector terminal No.2 and B-05
power transistor controller connector terminal
No.4.
AC313820AL
Connector: B-05
Harness side
B-05 (B)
AC313822
Connector: B-10
AK
Harness side
• Check the blower linear controller power supply
line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 18.
NO :
Repair the wiring harness.
Main
Index
Group
TOC
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-20
Step 18. Check the wiring harness between B-15
combination meter connector (terminals 19 and
20) and B-05 power transistor controller
connector (terminals 1 and 3).
AC313820AL
Connector: B-05
Harness side
B-05 (B)
AC313822 AB
Connector: B-15
Harness side
B-15 (B)
• Check the blower linear controller power supply
line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 19.
NO :
Repair the wiring harness.
Step 19. Replace the power transistor and
recheck the trouble symptom
Check that the blower motor operates normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the combination meter (meter and
A/C-ECU).
Main
Index
Group
TOC
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