Mitsubishi 380. Manual — part 378
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-52
STEP 6. Using diagnostic tool MB991958, check data list
item 7: Transmission Fluid Temperature Sensor.
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.
(3) Set diagnostic tool MB991958 to the data reading mode.
• Item 7: Transmission Fluid Temperature Sensor.
• When the engine is cool: Diagnostic tool display is
almost equal to the ambient temperature (atmo-
spheric temperature)
NOTE: Set diagnostic tool MB991958 to the Engine
MPI data list reading mode for item number 5, Intake
Air Temperature (IAT) Sensor and note the tempera-
ture measurement. When the engine is cool, the
temperature should be almost equal to the ambient
temperature (atmospheric temperature), and the IAT
sensor measurement should be approximately the
same as the Transmission Fluid Temperature Sen-
sor.
• When the engine is warm, at approximately running
temperature: 70
− 80°C.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
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 : Replace the A/T-ECU.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-53
STEP 7. Measure the sensor 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) Measure the voltage between terminal 6 and ground.
• When transmission fluid temperature is 20°C (68°F),
voltage should measure between 3.8 and 4.0 volts.
• When transmission fluid temperature is 40°C (104°F),
voltage should measure between 3.2 and 3.4 volts.
• When transmission fluid temperature is 80°C (176°F),
voltage should measure between 1.7 and 1.9 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?
YES : Go to Step 6.
NO : Go to Step 8.
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
10DB081A
B-22 CONNECTOR:
AUTOMATIC TRANSMISSION DIAGNOSIS
AUTOMATIC TRANSMISSION
23A-54
STEP 8. 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 9.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
STEP 9. Check the harness for a short circuit to ground
between A/T-ECU connector B-22 terminal 6 and A/T
control solenoid valve connector B-108 terminal 1.
Q: Is the harness wire in good condition?
YES : Go to Step 6.
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
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-55
(P0715): Input Shaft Speed Sensor System
.
10DB083A
A-13 (GR)
CONNECTOR: A-13
1
4
7
8
2 3
5
13 14
17
15
12
16
11
10
9
6
16DB564A
COVER
AIR
CLEANER
A/T
CONTROL
UNIT
CONNECTORS: B-19, B-22
AC305354
TRANSMISSION
RANGE SWITCH
B-109 (GR)
AC
CONNECTOR: B-109
1
3
2
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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