Mitsubishi Galant. Manual — part 437
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-215
STEP 14. Check harness for short circuit to ground, open
circuit or damage between A/T control relay connector A-
19X terminal 3 and PCM connector C-41 terminals 77 and
89.
Q: Is the harness wire in good condition?
YES : Go to Step 15.
NO : Repair it.
STEP 15. Check harness for damage between A/T control
relay connector A-19X terminal 1 and battery.
Q: Is the harness wire in good condition?
YES : Go to Step 16.
NO : Repair it.
STEP 16. Check harness for damage between A/T control
relay connector A-19X terminal 2 and the ground.
Q: Is the harness wire in good condition?
YES : Go to Step 17.
NO : Repair it.
AC004286 AC
A/T CONTROL
RELAY
BATTERY
CONNECTOR: A-19X
AC004197
PCM
AC
CONNECTOR: C-41
AC004286 AC
A/T CONTROL
RELAY
BATTERY
CONNECTOR: A-19X
AC004286 AC
A/T CONTROL
RELAY
BATTERY
CONNECTOR: A-19X
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-216
STEP 17. Check harness for short circuit to ground
between A/T control relay connector A-19X terminal 4 and
PCM connector C-40 terminal 50.
Q: Is the harness wire in good condition?
YES : Repair it because of harness short circuit to ground
between A/T control relay connector A-19X terminal 3
and solenoid valve assy connector B-38 terminal 9.
NO : Repair it.
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Vehicle does not Move
COMMENT
If the engine does not start when the selector lever is
in "P" or "N" position, the cause is probably a
malfunction of Park/Neutral position switch system,
transaxle control cable assembly, engine system,
torque converter or oil pump.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
•
Malfunction of the Park/Neutral position switch
•
Malfunction of the transaxle control cable
assembly
•
Malfunction of the engine system
•
Malfunction of the torque converter
•
Malfunction of the oil pump
•
Malfunction of the PCM
DIAGNOSIS
REQUIRED SPECIAL TOOL:
MB991502: Scan Tool (MUT-II)
AC004286 AC
A/T CONTROL
RELAY
BATTERY
CONNECTOR: A-19X
AC004197
PCM
AD
CONNECTOR: C-40
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-217
STEP 1. Using scan tool MB991502, read the A/T
diagnostic trouble code.
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) Turn the ignition switch to "ON" position.
(3) Read the A/T diagnostic trouble code.
(4) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is A/T diagnostic trouble code numbers "27" or "28"
displayed?
YES : Refer to
, code number 27, 28:
Park/Neutral Position Switch System.
NO : Go to Step 2.
STEP 2. Check the transaxle control cable assembly.
Move the selector lever to each position, and check if the
manual control lever position of the Park/Neutral position
switch corresponds to the selector lever position.
Q: Is the manual control lever position correct?
YES : Go to Step 3.
NO : Repair the transaxle control cable. Refer to
, Park/Neutral Position Switch and Control Cable
Adjustment. Confirm that the malfunction symptom is
correct.
STEP 3. Check the engine.
Refer to GROUP 13A <2.4L Engine>, Diagnosis
−
Trouble
Symptom Chart
−
Starting
or GROUP 13B <3.0L
Engine>, Diagnosis
−
Trouble Symptom Chart
−
Starting
Q: Is the inspection result good?
YES : Go to Step 4.
NO : Repair or replace the appropriate engine
components.
AC003081AC
MB991502
DATA LINK
CONNECTOR
AC001856
P
R
N
D
3
2
L
PARK/NEUTRAL
POSITION SWITCH
MANUAL
CONTROL
LEVER
AB
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-218
STEP 4. Check the torque converter.
(1) Remove the transaxle.
(2) Check the torque converter for installation condition
(whether installed in a slanted direction or not), its spline or
its teeth for damage. Refer to GROUP 23B, Transaxle
.
Q: Is the torque converter in good condition?
YES : Go to Step 5.
NO : Repair or replace it.
STEP 5. Replace the oil pump.
Replace the oil pump (Oil pump cannot be repaired). Refer to
GROUP 23B, Transaxle
. Confirm that the
malfunction symptom is eliminated.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Go to Step 6.
STEP 6. Replace the PCM.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Start over at Step 1.
INSPECTION PROCEDURE 2: Does not M
M
M
Move Forward
COMMENT
If the vehicle does not move forward when the
selector lever is shifted from "N" to "D", "2" or "L"
range while the engine is idling, the cause is
probably abnormal line pressure or a malfunction of
the underdrive clutch or valve body.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
•
Abnormal line pressure
•
Malfunction of the underdrive solenoid valve
•
Malfunction of the underdrive clutch
•
Malfunction of the valve body
•
Malfunction of the PCM
DIAGNOSIS
REQUIRED SPECIAL TOOL:
MB991502: Scan Tool (MUT-II)
AC001857
AC001858
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