Mitsubishi Galant 9G. Manual — part 539
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
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-235
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. Using scan tool MB991958, check actuator test
item 06: Torque Converter Clutch Solenoid Valve.
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) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the actuator test mode.
• Item 06: Torque Converter Clutch Solenoid Valve.
• An audible clicking or buzzing should be heard when
the torque converter clutch solenoid valve is ener-
gized.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid valve operating properly?
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 Malfunctions
.
NO : Go to Step 2.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-236
STEP 2. Using scan tool MB991958, read the A/T
diagnostic trouble code.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 54 set? (DTC 54 may be set along with multiple
DTC 54: A/T Control Relay
System.
NO : Go to Step 3.
STEP 3. Using scan tool MB991958, read the A/T
diagnostic trouble code.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 31 set?
YES : Go to Step 8.
NO : Go to Step 4.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-237
STEP 4. Measure the torque converter clutch solenoid
valve resistance at A/T control solenoid valve assembly
connector B-108.
(1) Disconnect connector B-108 and measure at the solenoid
valve side.
(2) Measure the resistance between solenoid valve assembly
connector B-108 terminals 7 and 10.
Resistance value: 2.7
−3.4 Ω [at 20°C (68°F)]
Q: Is the measured resistance 2.7
−3.4 Ω [at 20°C (68°F)]?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Measure the solenoid valve resistance at the
torque converter clutch solenoid valve assembly inside
the transaxle.
(1) Disconnect connector B-108-4 and measure at the solenoid
valve side.
(2) Measure the resistance between torque converter clutch
solenoid valve terminals 1 and 2.
Resistance value: 2.7
−3.4 Ω [at 20°C (68°F)]
Q: Is the measured resistance 2.7
−3.4 Ω [at 20°C (68°F)?
YES : Replace the harness wire between A/T control
solenoid valve assembly connector B-108 and the
solenoid valves.
NO : Replace the torque converter clutch solenoid valve.
Refer to GROUP 23B, Valve Body
AC306322
CONNECTOR: B-108
B-108 (GR)
AC
TRANSMISSION
RANGE SWITCH
2
7
1
8
3
9
4
6
10
5
AC210697
2
7
1
8
3
9
4
6
10
5
AB
B-108 HARNESS CONNECTOR:
A/T CONTROL SOLENOID
VALVE ASSEMBLY SIDE
AC002219
CONNECTOR: B-108-4
CA
B-108-4
VALVE BODY
ASSEMBLY
2
1
AC201141BD
B-108-4 HARNESS CONNECTOR:
TORQUE CONVERTER CLUTCH
SOLENOID VALVE SIDE
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