Mitsubishi Galant (2004+). Manual — part 679
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
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-270
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Check Conditions
• Voltage of battery: 9 volts or more.
• Time after PCM turns on A/T control relay: 0.5
second or more.
Judgement Criteria
• A/T control relay output voltage: 7 volts or less.
(0.1 second)
• If DTC 54 (P1751) 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 A/T control relay
• Damaged harness or connector
AC205241
START
END
No
Malfunction
Yes
Good
No
Yes
No
Yes
No
Yes
No
Yes
Timer start
TCM turn on A/T
control relay
Timer > 0.5 sec.
Voltage of battery > 9 V
Output voltage from
control relay < 7 V
Continuous failure
for 0.1 sec.
PCM
AB
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