Mitsubishi 380. Manual — part 393
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-112
STEP 20. Check A/T-ECU connector B-22 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connector and terminals in good condition?
YES : Go to Step 21.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
STEP 21. Check harness for open circuit or short circuit to
ground between A/T-ECU connector B-22 terminal 26 and
transmission inhibitor switch connector B-110 terminal 4.
Q: Is the harness wire in good condition?
YES : Go to Step 5.
NO : Repair or replace the harness wire.
16DB564A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTORS: B-19, B-22
16DB564A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTORS: B-19, B-22
AC210068
CONNECTOR: B-110
B-110 (B)
AE
TRANSMISSION
RANGE SWITCH
1
7
2
8
3
5
9
4
10
6
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-113
STEP 22. Check the transmission inhibitor switch.
Measure the resistance between the terminals for each trans-
mission range as indicated in the table below.
Q: Is the measured resistance less than 2 ohms for each
transmission range?
YES : Go to Step 23.
NO : Replace the transmission inhibitor switch. Refer to
GROUP 23B, Transmission
.
STEP 23. Check transmission inhibitor switch connector
B-110 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Are the connector and terminals in good condition?
YES : Go to Step 24.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
TRANSMISSION
RANGE
TERMINAL CONNECTION OF
TESTER
SPECIFIED CONDITION
P
3
− 8, 9 − 10
Less than 2 ohms.
R
7
− 8
N
4
− 8, 9 − 10
D
1
− 8
AC305881
AC305532
AC305679
<F4A4B>
<F4A5A>
AC
TRANSMISSION
RANGE SWITCH
TRANSMISSION
RANGE SWITCH
AC210182AC
P
R
N
D
<F4A5A>
AC210068
CONNECTOR: B-110
B-110 (B)
AE
TRANSMISSION
RANGE SWITCH
1
7
2
8
3
5
9
4
10
6
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-114
STEP 24. Measure the transmission inhibitor switch output
voltage at A/T-ECU connector B-22 by using check
harness special tool MB992045.
(1) Disconnect all the connectors from the A/T-ECU.
(2) Connect special tool MB992045 (check harness) between
the A/T-ECU and the body-side harness connector.
(3) Turn the ignition switch to the "ON" position.
(4) Move the selector lever to the "D" position.
(5) Measure the voltage between connector B-22 terminal 24
and ground.
• The voltage should equal battery voltage
(approximately12 volts).
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the voltage measure battery positive voltage?
YES : Go to Step 11.
NO : Go to Step 25.
16DB564A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTORS: B-19, B-22
10DB161A
A/T-ECU CHECK HARNESS
MB992045
A/T-ECU
A/T-ECU CHECK
HARNESS
CONNECTORS
10DB097A
B-22 HARNESS
CONNECTOR:
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-115
STEP 25. Check A/T-ECU connector B-22 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connector and terminals in good condition?
YES : Go to Step 26.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
STEP 26. Check harness for open circuit or short circuit to
ground between A/T-ECU connector B-22 terminal 24 and
transmission inhibitor switch connector B-110 terminal 1.
Q: Is the harness wire in good condition?
YES <Vehicles without sport mode> : Go to Step 5.
YES <Vehicles with sport mode> : Go to Step 27.
NO : Repair or replace the harness wire.
16DB564A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTORS: B-19, B-22
16DB564A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTORS: B-19, B-22
AC210068
CONNECTOR: B-110
B-110 (B)
AE
TRANSMISSION
RANGE SWITCH
1
7
2
8
3
5
9
4
10
6
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