Mitsubishi Galant (2004+). Manual — part 689
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-307
STEP 2. Check the shift points.
Q: Are the shift points early or late only when transmission
fluid is -29
°C (84°F) or less (early), or 125°C (257°F) or
more (late)?
YES : The symptom is due to characteristics of the
INVECS-II system, but is not abnormal.
NO : Go to Step 3.
STEP 3. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and the valve
body for damage. Repair or replace the faulty parts. Refer to
GROUP 23B, Valve Body
.
Replace the valve body assembly if the damages are thought
to be irreparable. Then check the symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 4.
STEP 4. Replace the PCM.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Start over at Step 1.
INSPECTION PROCEDURE 12: No Diagnostic Trouble Codes (Does not Shift)
AC001860 AB
VALVE
BODY
ASSEMBLY
POWERTRAIN
CONTROL
MODULE
RELAY
BOX
BATTERY
BATTERY
BACKUP
AC210058AC
Backup Power Supply System Circuit
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-308
.
CIRCUIT OPERATION
PCM (terminal number 42) receives battery positive
voltage from the battery.
.
COMMENT
If shifting does not occur while driving and no diag-
nostic trouble codes are output, a malfunction of the
transmission range switch, or PCM may exist.
.
TROUBLESHOOTING HINTS (The most likely
causes for this condition:)
• Malfunction of the transmission range switch
• Damaged harness, connector
• Malfunction of the PCM
DIAGNOSIS
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
STEP 1. Check the vehicle acceleration.
Q: Does the vehicle accelerate poorly (transaxle stays in
3rd gear) when starting from a stop with the selector
lever in "D" range?
YES : Go to Step 2.
NO : Go to Step 5.
AC306248AH
CONNECTOR: B-20
PCM
AIR
CLEANER
JAE
41
37
32
40
39
23
21 22
35
31
30
26
36
27
43
42
25
24
38
34
29
33
28
B-20
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-309
STEP 2. Measure the backup power supply voltage at PCM
connector B-20 by using check harness special tool
MB991923.
(1) Disconnect all the connectors from the PCM.
(2) Connect special tool MB991923 (check harness) between
the PCM and the body-side harness connector.
(3) Turn the ignition switch to the "ON" position.
AC306248AH
CONNECTOR: B-20
PCM
AIR
CLEANER
JAE
41
37
32
40
39
23
21 22
35
31
30
26
36
27
43
42
25
24
38
34
29
33
28
B-20
AC209793AK
SPECIAL TOOL 23-PIN CONNECTOR
WITHOUT RED TAPE
(PCM CONNECTOR B-20)
B-20
(GR)
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
PCM
MB991923
BODY SIDE
HARNESS
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-310
(4) Measure the voltage between terminal 42 and ground.
• The voltage should measure battery positive voltage.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES : Go to Step 5.
NO : Go to Step 3.
STEP 3. Check PCM connector B-20 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Is the connector in good condition?
YES : Go to Step 4.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
. Then retest the system.
AC210720
24
33
37
42
43
25
34
38
29
40
41
39
21
30
22
23
27
36
32
28
31
35
26
JAE
AC
B-20 HARNESS
CONNECTOR:
COMPONENT SIDE
AC306248AH
CONNECTOR: B-20
PCM
AIR
CLEANER
JAE
41
37
32
40
39
23
21 22
35
31
30
26
36
27
43
42
25
24
38
34
29
33
28
B-20
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