Mitsubishi Montero (2004+). Manual — part 925
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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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.
• Time after lock up clutch release: 5 seconds or
more.
Judgement Criteria
• Calculated slip (engine speed - input speed): 5
r/min or less. (10 seconds)
• Calculated slip (engine speed - input speed): -5
r/min or more. (10 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 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, 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
• MB991911: MUT-III Main Harness B
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?
YES : Refer to
, DTC 36: Torque Converter
Clutch Solenoid Valve System.
NO : Go to Step 2.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 2. Using scan tool MB991958, check data list item 52:
Amount of Torque Converter Clutch Slippage.
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) Start the engine. (Warming up engine)
(3) Set scan tool MB991958 to the data reading mode.
• Item 52: Torque Converter Clutch Amount of Slippage.
• Driving at a constant speed of 80 km/h (50 mph), the
display should be "
−10 to 10 r/min."
• If the accelerator pedal is released, the display on
the scan tool changes (50 km/h (31 mph) and less).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the torque converter clutch slippage within the
specified range?
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 Malfunction
.
NO : Go to Step 3.
STEP 3. Replace the PCM.
(1) Replace the PCM.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 53 set?
YES : Go to Step 4.
NO : The procedure is complete.
STEP 4. Replace the valve body.
(1) Replace the valve body. Refer to GROUP 23B,
Transmission
.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 53 set?
YES : Replace the Torque Converter. Refer to
Transmission and Transfer Assembly .
NO : The procedure is complete.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
ACX02161AD
VALVE BODY ASSEMBLY
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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DTC 54 (P1751): A/T Control Relay System
AC205196AB
AC204167
CONNECTOR : A-03
AT
A-03 (B)
6
12
5
3 4
2
1
9 10
8
7
11
AC204750
CONNECTOR : D-13
AB
PCM
1
3 4
2
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.
CIRCUIT OPERATION
• A/T control relay (terminal 1) receives battery
positive voltage through a battery.
• The PCM (terminal 127) applies voltage to ener-
gize the A/T control relay (terminal 4). With the
A/T control relay energized, system voltage is
applied to the PCM (terminals 123 and 124).
.
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 45 (P0735): 5th 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
• DTC 35 (P0773): Reduction solenoid malfunction
Sensor (The sensor below is determined to be
normal)
• Torque converter clutch solenoid
• Low-reverse solenoid
• Underdrive solenoid
• Second solenoid
• Overdrive solenoid
• Reduction solenoid
.
AC204171
CONNECTOR : D-14
AM
4
9
8
6
5
7
1 2
3
10
AC204681AD
CONNECTOR: D-136
D-136 (GR)
121 122
123
124
125 126 127 128 129 130
131 132
133
134 135
136 137 138
139 140
141
142 143
144
145
146
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