Mitsubishi Pajero Pinin. Manual — part 190
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-10
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE 1
Communication with the MUT-
II
is not possible
Probable cause
If communication with the MUT-
II
is not possible, the cause is probably a malfunction
in the self-diagnosis system or the A/T-ECU is not functioning.
Malfunction of self-diagnosis system
Malfunction of A/T-ECU power circuit
Malfunction of A/T-ECU earth circuit
Malfunction of A/T-ECU
Malfunction of harness and connector
NO
Check and repair the self-diagnosis
system with the MUT-
II
YES
Measure at A/T-ECU connector D-45
Disconnect the connector and measure at the harness side.
Voltage between terminals 5 and 14 and the earth
(ignition switch: ON)
OK: System voltage
Continuity between terminal 19 and earth
OK: Continuity
OK
Replace the A/T-ECU.
NG
OK
Check the trouble symptoms.
NG
Replace the A/T-ECU.
Is communication with other systems possible using the MUT-
II
?
NG
Repair
OK
Check the following connectors:
<L.H. drive vehicles> D-46, D-34, C-37, C-70, C-35
<R.H. drive vehicles> D-46, D-34, C-39, C-70, C-35
Check the trouble symptoms.
NG
Repair
OK
Check the following connectors:
<L.H. drive vehicles> D-45, C-24, C-78, C-74, D-34, C-68, C-72
<R.H. drive vehicles> D-45, C-26, C-78, C-74, D-34, C-68, C-72
Check the trouble symptoms
NG
Repair
OK
Check and repair the harness wire between the A/T-ECU
and the power supply.
Check and repair the harness wire between the A/T-ECU
and the earth.
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-11
INSPECTION PROCEDURE 14
Overdrive switch system
Probable cause
If downshifting does not occur when overdrive switch is turned off while driving
in 4th gear, or if shifting to 4th gear is not possible, the cause is probably a problem
in the overdrive switch system.
Malfunction of overdrive switch
Malfunction of harness or connector
Malfunction of A/T-ECU
Malfunction of ignition switch
*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).
OK
Completed
NG
OK
Check the trouble symptoms.
Check the ignition switch. (Refer to GROUP 54 – Ignition Switch.)*
Replace the A/T-ECU.
NG
Repair
OK
MUT-
II
SERVICE DATA
35 – Overdrive switch
OK: MUT-
II
display and overdrive switch OD/OD-OFF posi-
tion should match.
NG
Repair
OK
Check the overdrive switch. (Refer to P.23-51.)*
NG
Measure at overdrive switch connector D-35.
Disconnect the connector and measure at the harness side
Voltage between terminal 3 and earth
(Ignition switch: ON)
OK: System voltage
Check the following connectors: D-35, D-34, D-46
NG
Repair
OK
Check the harness wire between the overdrive switch and the
A/T-ECU.
INSPECTION PROCEDURE 15
Stop lamp switch system
Probable cause
If large shocks occur during squat control, the cause is probably a problem with
the stop lamp switch.
Malfunction of stop lamp switch
Malfunction of harness or connector
Malfunction of A/T-ECU
*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).
OK
Check the stop lamp switch
(Refer to GROUP 35 – Brake Pedal)*
NG
NG
Repair
OK
OK
Check the trouble symptoms.
Replace the A/T-ECU.
MUT-
II
SERVICE DATA
28 – Stop lamp switch
OK: ON when the brake pedal is depressed and OFF when
the brake pedal is released
Check the following connectors:
<L.H. drive vehicles> C-04, C-02, C-29, C-24, D-02, D-45
<R.H. drive vehicles> C-04, C-02, C-41, D-02, D-45
OK
NG
Repair
Check the harness wire between the stop lamp switch and the
A/T-ECU.
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-12
SERVICE DATA REFERENCE TABLE
Item No. 37 has been changed since the A/T-ECU has been changed. The other SERVICE DATA are
the same as before.
Item
No.
Inspection item
Inspection conditions
Normal value
37
Inhibitor switch
Ignition switch: ON
Engine: Stopped
Selector lever position: P
P
Engine: Stopped
Selector lever position: R
R
Selector lever position: N
N
Selector lever position: D
D
Selector lever position: 2
2
Selector lever position: L
L
A/T-ECU TERMINAL VOLTAGE REFERENCE CHART
Terminal
No.
Inspection item
Inspection conditions
Standard value
1
Solenoid valve No. 1
When in 1st or 2nd gear
System voltage
When in 3rd or 4th gear
0 V
2
Solenoid valve No. 2
When in 2nd or 3rd gear
System voltage
When in 1st or 4th gear
0 V
3
Free-wheeling engage
switch
Transfer lever position: Other than 4WD
System voltage
switch
Transfer lever position: 4WD
0 V
5
Back-up power supply
Ignition switch: OFF
System voltage
6
Solenoid valve No. 3
When lockup clutch is operating
System voltage
When lockup clutch is not operating
0 V
11
Communication with input
signals from engine-ECU
Engine: Idling
Selector lever position: D
Other than 0 V
13
A/T fluid temperature
sensor
ATF temperature: 120
C
Approx. 0.3 V
sensor
ATF temperature: 150
C
Approx. 0.15 V
14
Power supply
Ignition switch: OFF
0 V
Ignition switch: ON
System voltage
17
Communication with output
signals to engine-ECU
Engine: Idling
Selector lever position: D
Other than 0 V
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-13
Terminal
No.
Standard value
Inspection conditions
Inspection item
18
Stop lamp switch
Brake pedal: Depressed
System voltage
Brake pedal: Released
0 V
19
Earth
Engine: Idling
0 V
20
A/T fluid temperature
sensor earth
–
–
21
Diagnostic output terminal
–
–
23
Input shaft speed sensor
Ignition switch: OFF
0 V
Ignition switch: ON
2.5 V
24
Output shaft speed sensor
Vehicle: Stopped
Approx. 2.5 V
Vehicle: Driving
Other than 2.5 V
25
Overdrive switch
Overdrive switch: ON
System voltage
Overdrive switch: OFF
0 V
26
Inhibitor switch P
Selector lever position: P
System voltage
Selector lever position: Other than P
0 V
27
Inhibitor switch R
Selector lever position: R
System voltage
Selector lever position: Other than R
0 V
30
Input shaft speed sensor
earth
–
–
31
Output shaft speed sensor
earth
–
–
33
Wide open throttle switch
Accelerator pedal: Released
4.5 – 5.5 V
Accelerator pedal: Depressed
Less than 0.4 V
34
Dual-pressure switch
A/C switch: OFF
0 V
A/C switch: ON
System voltage
37
N range lamp
Ignition switch: ON
System voltage
Ignition switch: OFF
0 V
38
Inhibitor switch N
Selector lever position: N
System voltage
Selector lever position: Other than N
0 V
39
Inhibitor switch D
Selector lever position: D
System voltage
Selector lever position: Other than D
0 V
41
Diagnosis control terminal
–
–
42
Accelerator pedal position
sensor (power supply
Ignition switch: ON
Approx. 5 V
sensor (power supply
voltage)
Ignition switch: OFF
0 V
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