Mitsubishi Galant. Manual — part 446
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-251
STEP 6. Check harness for short circuit to ground between
dual pressure switch connector A-34 terminal 1 and
automatic compressor controller connector C-15 terminal
4.
Q: Is the harness wire in good condition?
YES : Go to Step 7.
NO : Repair it.
STEP 7. Using scan tool MB991502, check data list item 65:
Dual Pressure Switch.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to data reading mode for item65:
Dual Pressure Switch.
•
When the A/C is in operation, the scan tool display
should be "ON."
•
When the A/C is not in operation, the scan tool display
should be "OFF."
(4) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES : This malfunction is intermittent. Refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
−
How to Cope with Intermittent Malfunction
NO : Check the air conditioning system. Refer to GROUP
55A, Troubleshooting Strategy
.
AC004375AB
CONNECTOR: A-34
AC004376
CONNECTOR: C-15
AC
AC003081AC
MB991502
DATA LINK
CONNECTOR
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-252
STEP 8. Check connectors C-15 at automatic compressor
controller and C-12 at intermediate connector for damage.
Q: Are the connectors in good condition?
YES : Repair it because of harness open circuit between
automatic compressor controller connector
C-15 terminal 4 and dual pressure switch connector
A-34 terminal 1.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
.
STEP 9. Check the switch output voltage at PCM
connector C-41 by backprobing.
(1) Do not disconnect connector C-41.
(2) Start the engine and run at idle.
(3) Operate the A/C.
(4) Measure the voltage between terminal 83 and ground by
backprobing.
•
When the A/C is in operation, the voltage should be
battery positive voltage.
•
When the A/C is not in operation, the voltage should be
0.5 volt or less.
(5) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 14.
NO : Go to Step 10.
AC004376
CONNECTOR: C-12, C-15
AB
C-12
C-15
AC004197
PCM
AC
CONNECTOR: C-41
AC002096
C-41 CONNECTOR
HARNESS SIDE VIEW
AD
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-253
STEP 10. Check connectors C-41 at PCM and C-04, C-05 at
intermediate connector for damage.
Q: Are the connectors in good condition?
YES : Go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
.
STEP 11. Check harness for short circuit to ground or
open circuit between dual pressure switch connector A-34
terminal 2 and PCM connector C-41 terminal 83.
Q: Is the harness wire in good condition?
YES : Go to Step 12.
NO : Repair it.
AC004197
PCM
AC
CONNECTOR: C-41
AC004287
CONNECTOR: C-04, C-05
AG
C-04
C-05
AC004375AB
CONNECTOR: A-34
AC004197
PCM
AC
CONNECTOR: C-41
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-254
STEP 12. Check the dual pressure switch.
Refer to GROUP 55A, Dual Pressure Switch Check
.
Q: Is the switch operating properly?
YES : Go to Step 13.
NO : Replace the dual pressure switch. Refer to GROUP
55A, Refrigerant Line
.
STEP 13. Using scan tool MB991502, check data list item
65: Dual Pressure Switch.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to data reading mode for item65:
Dual Pressure Switch.
•
When the A/C is in operation, the scan tool display
should be "ON."
•
When the A/C is not in operation, the scan tool display
should be "OFF."
(4) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES : This malfunction is intermittent. Refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
−
How to Cope with Intermittent Malfunction
NO : Replace the PCM.
STEP 14. Check connector C-41 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 13.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
.
AC003081AC
MB991502
DATA LINK
CONNECTOR
AC004197
PCM
AC
CONNECTOR: C-41
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