Mitsubishi Galant (2004+). Manual — part 670
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-231
STEP 11. Check PCM connector B-21 and A/T control
solenoid valve assembly connector B-108 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connectors and terminals in good condition?
YES : Go to Step 12.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
AC306248AC
B-21
(B)
CONNECTOR: B-21
PCM
AIR
CLEANER
73
80
54
67
60
71 72
77 78 79
64
51
59
58
65
52
66
53
75
74
76
81 82
83
63
JAE
62
68
61
55
69
56
70
57
AC306322
CONNECTOR: B-108
B-108 (GR)
AC
TRANSMISSION
RANGE SWITCH
2
7
1
8
3
9
4
6
10
5
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-232
STEP 12. Check the harness for an open or short circuit to
ground between PCM connector B-21 (terminals 65, 66 and
55) and A/T control solenoid valve assembly connector
B-108 (terminals 3, 4 and 5).
Q: Are the harness wires in good condition?
YES : Go to Step 13.
NO : Repair or replace the harness wire.
AC306248AC
B-21
(B)
CONNECTOR: B-21
PCM
AIR
CLEANER
73
80
54
67
60
71 72
77 78 79
64
51
59
58
65
52
66
53
75
74
76
81 82
83
63
JAE
62
68
61
55
69
56
70
57
AC306322
CONNECTOR: B-108
B-108 (GR)
AC
TRANSMISSION
RANGE SWITCH
2
7
1
8
3
9
4
6
10
5
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-233
STEP 13. Check the harness for an open or short circuit to
ground between A/T control solenoid valve assembly
connector B-108 (terminals 3, 4, 5, and 9) and solenoid
valve connectors B-108-1, B-108-2 and B-108-3.
Q: Is the harness wire in good condition?
YES : Replace the PCM.
NO : Replace the harness wire.
DTC 36 (P0743): Torque Converter Clutch Solenoid Valve System
.
Solenoid Valve System Circuit
Refer to
.
CIRCUIT OPERATION
Refer to
.
DESCRIPTIONS OF MONITOR METHODS
• If lock-up is not engaged, and solenoid terminal
voltage is below specified value, PCM judges that
torque converter clutch solenoid valve has a fail-
ure.
.
MONITOR EXECUTION
• Continuous
.
MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• DTC 41 (P0731): 1st gear incorrect ratio
• DTC 42 (P0732): 2nd gear incorrect ratio
• DTC 43 (P0733): 3rd gear incorrect ratio
• DTC 44 (P0734): 4th gear incorrect ratio
• DTC 46 (P0736): Reverse gear incorrect ratio
• DTC 31 (P0753): Low-reverse solenoid malfunc-
tion
• DTC 32 (P0758): Underdrive solenoid malfunc-
tion
• DTC 33 (P0763): Second solenoid malfunction
• DTC 34 (P0768): Overdrive solenoid malfunction
• DTC 54 (P1751): A/T control relay malfunction
Sensor (The sensor below is determined to be
normal)
• Low-reverse solenoid
• Underdrive solenoid
• Second solenoid
• Overdrive solenoid
• A/T control relay
.
AC306322
CONNECTOR: B-108
B-108 (GR)
AC
TRANSMISSION
RANGE SWITCH
2
7
1
8
3
9
4
6
10
5
AC002219
CONNECTORS: B-108-1, B-108-2, B-108-3
CD
B-108-1
B-108-2
B-108-3
VALVE BODY
ASSEMBLY
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-234
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Check Conditions
• Solenoid status: either solid ON or OFF.
• Voltage of battery: 10 volts or more.
Judgement Criteria
• Solenoid voltage: 3 volts or less. (0.3 second)
• If DTC 36 (P0743) is set consecutively four times,
the transaxle is locked into 3rd gear as a fail-safe
measure, and the "N" range light flashes once
per second.
.
OBD-II DRIVE CYCLE PATTERN
Start the engine, and keep the vehicle stopped in "P"
range for 5 seconds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Malfunction of the torque converter clutch sole-
noid valve
• Damaged harness or connector
• Malfunction of the PCM
AC205240
START
END
TCC solenoid is in ON
or OFF steady state
Voltage of battery > 10 V
Solenoid circuit
voltage < 3 V
Continuous failure
for 0.3 sec.
Good
Malfunction
Yes
No
Yes
No
Yes
No
Yes
No
TCC solenoid valve is in
ON or OFF steady state
AC
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