Mitsubishi 380. Manual — part 416
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-204
STEP 8. 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 A/T Item 10 set?
YES : Replace the torque converter. Refer to GROUP 23B,
NO : The procedure is complete.
(P0742): Damper Clutch Control is Stuck On
.
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 inhibitor 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 for 30 sec-
onds. 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 damper clutch control solenoid
valve
• Malfunction of the valve body
• Damaged harness or connector
• Malfunction of the A/T-ECU
Circuit drawings
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
• Refer to component locations GROUP-
DIAGNOSIS
Required Special Tool:
• MB991958: Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
VALVE BODY
ASSEMBLY
10DB117A
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-205
STEP 1. Using diagnostic tool MB991958, read the A/T
diagnostic trouble code.
CAUTION
To prevent damage to diagnostic tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting diagnostic tool
MB991958.
(1) Connect diagnostic 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 (P0743) set?
, (P0743): Damper Clutch Control
Solenoid Valve System.
NO : Go to Step 2.
STEP 2. Using diagnostic tool MB991958, check A/T data
list item 10: Amount of Damper Clutch Control Slippage.
CAUTION
To prevent damage to diagnostic tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting diagnostic tool
MB991958.
(1) Connect diagnostic tool MB991958 to the data link
connector.
(2) Start the engine. (Warming up engine)
(3) Set diagnostic tool MB991958 to the data reading mode.
• Item 10: Damper Clutch Control Amount of Slippage.
• Driving at a constant speed of 60 km/h, the display
should be "
−10 to 10 r/min."
• If the accelerator pedal is released, the display on
the diagnostic tool changes (50 km/h and less).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the damper clutch control 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.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-206
STEP 3. Replace the A/T-ECU.
(1) Replace the A/T-ECU.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is (P0742) 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 (P0742) set?
YES : Replace the Torque Converter. Refer to GROUP 23B,
NO : The procedure is complete.
VALVE BODY
ASSEMBLY
10DB117A
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-207
(P1751): A/T Control Relay System
.
AC306223
A-13 (GR)
AB
CONNECTOR: A-13
1
4
7
8
2 3
5
13 14
17
15
12
16
11
10
9
6
10DB098A
RELAY BOX
CONNECTOR: B-16X
2
1
3 4
FRONT OF
VEHICLE
16DB564A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTORS: B-19, B-22
10DB084A
CONNECTORS: C-214, 215
1
3 4
2
6
5
C-214
C-215
6
1
7
2
9
8
10
3
5
12
11
4
1314
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