Mitsubishi Galant 9G. Manual — part 547
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-266
STEP 2. Using scan tool MB991958, check data list item 52:
Amount of Torque Converter Clutch Slippage.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine. (Warming up engine)
(3) Set scan tool MB991958 to the data reading mode.
• Item 52: Torque Converter Clutch Amount of Slippage.
• Driving at a constant speed of 60 km/h (37 mph), the
display should be "
−10 to 10 r/min."
• If the accelerator pedal is released, the display on
the scan tool changes (50 km/h (31 mph) and less).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the torque converter clutch slippage within the
specified range?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
NO : Go to Step 3.
STEP 3. Replace the PCM.
(1) Replace the PCM.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 53 set?
YES : Go to Step 4.
NO : The procedure is complete.
STEP 4. Replace the valve body.
(1) Replace the valve body. Refer to GROUP 23B, Transaxle
.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 53 set?
YES : Replace the Torque Converter. Refer to GROUP 23B,
.
NO : The procedure is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC001860 AB
VALVE
BODY
ASSEMBLY
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-267
DTC 54 (P1751): A/T Control Relay System
RELAY
BOX
JUNCTION
BLOCK
JOINT
CONNECTOR
(1)
IGNITION
SWITCH (IG1)
BATTERY
A/T CONTROL
RELAY
SOLENOID
VALVE POWER
SUPPLY
RELAY
BOX
POWERTRAIN
CONTROL
MODULE
AC209761AC
A/T Control Relay System Circuit
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-268
AC306223
A-13 (GR)
AB
CONNECTOR: A-13
1
4
7
8
2 3
5
13
14
17
15
12
16
11
10
9
6
AC306354
RELAY BOX
AB
CONNECTOR: B-16X
2
1
3
4
FRONT OF
VEHICLE
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
AC305231
CONNECTOR: C-01
AS
33
22
11
28
17
16
15
14
13
12
25
2324
2627
3
1 2
4 5
21
20
19
18
29 30
32
31
7
6
8
10
9
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-269
.
CIRCUIT OPERATION
• A/T control relay (terminal 1) receives the battery
positive voltage through a dedicated 20 amp
fuse.
• When the ignition switch is turned to the "ON"
position, the PCM (terminal 82) receives battery
voltage from the ignition switch. The PCM (termi-
nal 82) applies voltage to energize the A/T control
relay (terminal 3). With the A/T control relay ener-
gized, system voltage is applied to the PCM (ter-
minals 70 and 57).
.
DESCRIPTIONS OF MONITOR METHODS
• If relay output voltage is below specified value,
PCM judges that A/T control relay has a failure.
.
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 36 (P0743): Torque converter clutch sole-
noid malfunction
• 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
Sensor (The sensor below is determined to be
normal)
• Torque converter clutch solenoid
• Low-reverse solenoid
• Underdrive solenoid
• Second solenoid
• Overdrive solenoid
.
AC207134
C-214
C-215
CONNECTORS: C-214, 215
AO
1
3 4
2
6
5
C-214
C-215
6
1
7
2
9
8
10
3
5
12
11
4
1314
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