Mitsubishi 380. Manual — part 409
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-176
STEP 2. Using diagnostic tool MB991958, read the A/T
diagnostic trouble code.
(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 (P1751) set? (P1751 may be set along with multiple
(P1751): A/T Control Relay
System.
NO : Go to Step 3.
STEP 3. Using diagnostic tool MB991958, read the A/T
diagnostic trouble code.
(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: Are (P0753) and (P0743) set? (Multiple DTCs may be
set).
YES : Go to Step 8.
NO : Go to Step 4.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-177
STEP 4. Measure the reduction 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 8 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
reduction solenoid valve assembly inside the
transmission.
(1) Disconnect connector B-108-6 and measure at the solenoid
valve side.
(2) Measure the resistance between reduction 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 reduction 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
10DB100A
2
7
1
8
3
9
4
6
10
5
B-108 HARNESS CONNECTOR:
A/T CONTROL SOLENOID
VALVE ASSEMBLY SIDE
CONNECTOR: B-108-6
VALVE BODY
ASSEMBLY
B-108-6
10DB105A
2
1
10DB101A
B-108-6 HARNESS CONNECTOR:
REDUCTION SOLENOID
VALVE SIDE
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-178
STEP 6. Check A/T-ECU connector B-22 and A/T control
solenoid valve assembly connector B-108 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connectors and terminals in good condition?
YES : Go to Step 7.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
16DB564A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTORS: B-19, B-22
AC306322
CONNECTOR: B-108
B-108 (GR)
AC
TRANSMISSION
RANGE SWITCH
2
7
1
8
3
9
4
6
10
5
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-179
STEP 7. Check the harness for an open or short circuit to
ground between A/T-ECU connector B-22 terminal 15 and
A/T control solenoid valve assembly connector B-108
terminal 8.
Q: Is the harness wire in good condition?
YES : Replace the A/T-ECU.
NO : Repair or replace the harness wire.
16DB564A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTORS: B-19, B-22
AC306322
CONNECTOR: B-108
B-108 (GR)
AC
TRANSMISSION
RANGE SWITCH
2
7
1
8
3
9
4
6
10
5
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