Mitsubishi Galant 9G. Manual — part 546
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-262
STEP 4. Using scan tool MB991958, read the A/T
diagnostic trouble code.
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) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 52 set?
YES : Replace the PCM.
NO : The procedure is complete.
STEP 5. Check the hydraulic pressure (for torque
converter).
Measure the hydraulic pressure for torque converter. Check if
the hydraulic pressure is within the standard value. Refer to
, Hydraulic Pressure Test.
Q: Is the hydraulic pressure within the standard value?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Adjust line pressure.
Adjust line pressure. Refer to
, Line Pressure Adjust-
ment. Then check the symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 8.
STEP 7. Replace the PCM.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 8.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
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STEP 8. 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 52 set?
YES : Replace the torque converter. Refer to GROUP 23B,
.
NO : The procedure is complete.
DTC 53 (P0742): Torque Converter Clutch is Stuck On
.
DESCRIPTIONS OF MONITOR METHODS
• With PCM signal for no lock-up engagement, if
vehicle speed equals or exceeds specified value,
accelerator is ON, and torque converter slip
amount is below specified value, PCM judges
that torque converter clutch is stuck ON.
.
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 21 (P0335): Crankshaft position sensor mal-
function
• DTC 22 (P0715): Input shaft speed sensor mal-
function
• DTC 23 (P0720): Output shaft speed sensor mal-
function
• DTC 52 (P0741): Torque converter clutch system
malfunction (Stuck OFF)
• DTC 36 (P0743): Torque converter clutch sole-
noid malfunction
• P0122: Throttle position sensor (main) malfunc-
tion (Low input)
• P0123: Throttle position sensor (main) malfunc-
tion (High input)
• P0222: Throttle position sensor (sub) malfunction
(Low input)
• P0223: Throttle position sensor (sub) malfunction
(High input)
• P2135: Throttle position sensor (main and sub)
range/performance problem
• P0638: Throttle actuator control motor circuit
range/performance problem
• P0642: Throttle position sensor power supply
• P1601: Communication malfunction (Between
PCM and throttle actuator control module)
• P0606: PCM main processor malfunction
• P2108: Throttle actuator control module proces-
sor malfunction
• P2100: Throttle actuator control motor circuit
(Open)
• P2101: Throttle actuator control motor magneto
malfunction
• P2102: Throttle actuator control motor circuit
(Shorted low)
• P2103: Throttle actuator control motor circuit
(Shorted high)
• P2122: Accelerator pedal position sensor (main)
circuit low input
• P2123: Accelerator pedal position sensor (main)
circuit high input
• P2127: Accelerator pedal position sensor (sub)
circuit low input
• P2128: Accelerator pedal position sensor (sub)
circuit high input
• P2138: Accelerator pedal position sensor (main
and sub) range/performance problem
Sensor (The sensor below is determined to be
normal)
• Input shaft speed sensor
• Output shaft speed sensor
• Crankshaft position sensor
• Torque converter clutch solenoid
• Throttle position sensor
• Accelerator pedal position sensor
.
AC001860 AB
VALVE
BODY
ASSEMBLY
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
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LOGIC FLOW CHARTS (Monitor Sequence)
.
AC205239
START
END
Transmission range
switch position is in
D, 3, 2 or L range
TCC solenoid is in
OFF steady state
TCC in disengagement area
Timer start
TCC in disengagement area
Timer > 5 secs.
V
THROTTLE
> 1.5 V
N
OPG-B
> 1,000 r/min
N
E
- 5 < N
IPG-A
< N
E
+ 5
Continuous failure
for 10 secs.
Good
Malfunction
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
N
E
:
Engine speed
N
OPG-B
: Output speed
(output shaft speed sensor)
N
IPG-A
: Input speed
(input shaft speed sensor)
V
THROTTLE
: Throttle position sensor
output voltage
AD
5 secs.
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
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DTC SET CONDITIONS
Check Conditions
• Throttle position sensor voltage: 1.5 volts or
more.
• Output speed: 1,000 r/min or more.
• Solenoid status: OFF.
• Transmission range switch position: D, 3, 2 or L.
• Time after lock up clutch release: 5 seconds or
more.
Judgement Criteria
• Calculated slip (engine speed - input speed): 5
r/min or more. (5 seconds)
• Calculated slip (engine speed - input speed): -5
r/min or less. (5 seconds)
.
OBD-II DRIVE CYCLE PATTERN
Start the engine, and drive at 30 km/h (19 mph) for
30 seconds. Then stop the vehicle, and turn "LOCK"
(OFF) the ignition switch. After that, restart the
engine, and drive again at 30 km/h (19 mph) for 30
seconds.
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CODE TO BE
SET ARE:)
• Malfunction of the torque converter clutch sole-
noid valve
• Malfunction of the valve body
• Damaged harness or 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. Using scan tool MB991958, read the A/T
diagnostic trouble code.
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) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 36 set?
, DTC 36: Torque Converter
Clutch Solenoid Valve System.
NO : Go to Step 2.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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