Mitsubishi Pajero Pinin. Manual — part 189
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-6
Code No. 31, 32 Input shaft speed sensor system, output
shaft speed sensor system
Probable cause
If no output pulse is detected from the input shaft speed sensor for 120 seconds
or more while driving in 3rd gear at a speed of 60 km/h or more, there is judged
to be an open circuit in the input shaft speed sensor and diagnosis code No. 31
is output. If not output pulse is detected from the output shaft speed sensor for
120 seconds or more while driving in 3rd gear at a speed of 60 km/h or more,
there is judged to be an open circuit in the output shaft speed sensor and diagnosis
code No. 32 is output.
Malfunction of the input shaft speed sensor
Malfunction of the output shaft speed sensor
Malfunction of harness or connector
Malfunction of the sensor rotor
Malfunction of A/T-ECU
Electrical noise
*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).
: Refer to the Transmission Workshop Manual
NG
OK
NG
Repair
Eliminate a source of electrical noise.
Input shaft speed sensor check (Refer to P.23-41).*
Output shaft speed sensor check (Refer to P.23-42).*
OK
NG
Repair
OK
NG
Check the trouble symptoms.
Check the sensor rotor.
Check the trouble symptoms.
Replace the input shaft speed sensor and output shaft speed sensor.
Replace the A/T-ECU.
NG
Repair
OK
Check the following connectors: B-03, D-46
NG
Repair
OK
Harness check
Between the input shaft speed sensor and the A/T-ECU
Between the output shaft speed sensor and the A/T-ECU
NG
Check the trouble symptoms.
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-7
Code No. 38 Vehicle speed sensor system
Probable cause
If no output pulse is detected from the vehicle speed sensor for 120 seconds or
more continuously while driving at a speed of 60 km/h or more, there is judged
to be an open circuit in the vehicle speed sensor and diagnosis code No. 38 is
output.
Malfunction of the vehicle speed sensor
Malfunction of harness or connector
Malfunction of the A/T
-
ECU
Malfunction of the ignition switch
*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).
(2) NG
(3) NG
Check the ignition switch. (Refer to GROUP 54 - Ignition switch.)*
Replace the A/T-ECU.
Replace the A/T-ECU.
Harness check
Between the vehicle speed sensor and the earth, and
repair if necessary.
OK
OK
(1) NG
Vehicle speed sensor check
(Refer to GROUP 54 – Combination meter.)*
NG
Replace
OK
NG
Repair
NG
NG
OK
NG
Repair
OK
NG
Repair
OK
NG
Repair
OK
NG
Repair
NG
Check trouble symptom.
Check the following connectors: D-02, D-46
Measure at the vehicle speed sensor connector B-08.
Disconnect the connector, and measure at the harness side.
(1) Voltage between 1 and earth (Ignition switch: ON)
OK: System voltage
(2) Voltage between 3 and earth (Ignition switch: ON)
OK: 4.8 - 5.2 V
(3) Continuity between 2 and earth
OK: Continuity
Check the following connectors: B-08, D-02, D-46
Harness check
Between the A/T-ECU and the vehicle speed sensor.
Check trouble symptom.
Harness check
Between the vehicle speed sensor and ignition switch
connector.
Check trouble symptom.
Check the following connectors:
<L.H. drive vehicles> D-02, C-38, C-02, C-76, C-74
<R.H. drive vehicles> D-02, C-41, C-76, C-74
NG
Repair
OK
Harness check
Between the A/T-ECU and the vehicle speed sensor.
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-8
Code No. 41, 42 Solenoid valve No.1 system
Probable cause
If the resistance value for a solenoid valve No.1 is too large, it is judged that there
is an open circuit in the solenoid valve No.1 and the diagnosis code No.41 is output.
If the resistance value for a solenoid valve No.1 is too small, it is judged that there
is a short-circuit in the solenoid valve No.1 and the diagnosis code No.42 is output.
Malfunction of solenoid valve No.1
Malfunction of harness or connector
Malfunction of the A/T-ECU
*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).
Solenoid valve No.1 check (Refer to P.23-42.)*
NG
Replace
OK
Check the following connectors: B-03, D-45
NG
Repair
OK
Check the harness wire between A/T-ECU and solenoid valve No.1.
NG
Repair
Check the trouble symptoms.
NG
Replace the A/T-ECU.
OK
Code No. 43, 44 Solenoid valve No.2 system
Probable cause
If the resistance value for a solenoid valve No.2 is too large, it is judged that there
is an open circuit in the solenoid valve No.2 and the diagnosis code No.43 is output.
If the resistance value for a solenoid valve No.2 is too small, it is judged that there
is a short-circuit in the solenoid valve No.2 and the diagnosis code No.44 is output.
Malfunction of solenoid valve No.2
Malfunction of harness or connector
Malfunction of the A/T-ECU
*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).
Solenoid valve No.2 check (Refer to P.23-42.)*
NG
Replace
OK
Check the following connectors: B-03, D-45
NG
Repair
OK
Check the harness wire between A/T-ECU and solenoid valve No.2.
NG
Repair
Check the trouble symptoms.
NG
Replace the A/T-ECU.
OK
Code No. 47, 48 Solenoid valve No.3 system
Probable cause
If the resistance value for a solenoid valve No.3 is too large, it is judged that there
is an open circuit in the solenoid valve No.3 and the diagnosis code No.47 is output.
If the resistance value for a solenoid valve No.3 is too small, it is judged that there
is a short-circuit in the solenoid valve No.3 and the diagnosis code No.48 is output.
Malfunction of solenoid valve No.3
Malfunction of harness or connector
Malfunction of the A/T-ECU
*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).
Solenoid valve No.3 check (Refer to P.23-42.)*
NG
Replace
OK
Check the following connectors: B-03, D-45
NG
Repair
OK
Check the harness wire between A/T-ECU and solenoid valve No.3.
NG
Repair
Check the trouble symptoms.
NG
Replace the A/T-ECU.
OK
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-9
Code No. 55 Abnormal communication with engine-ECU
Probable cause
If normal communication is not possible for a continuous period of 1 second or
more when the ignition switch is at the ON position and the battery voltage is 10
V or more, diagnosis code No. 55 is output. Diagnosis code No. 55 is also output
if the data being received is abnormal for a continuous period of 1 second under
the same conditions.
Malfunction of harness or connector
Malfunction of the engine-ECU
Malfunction of the A/T-ECU
MUT-
II
Self-Diag code
Is the diagnosis code No.61 output?
NO
YES
Check the following connectors:
<L.H. vehicles> C-19, C-25, D-34, D-45
<R.H. vehicles> C-19, C-26, D-34, D-45
NG
Repair
OK
Check the harness wire between engine-ECU and A/T-ECU.
NG
Repair
OK
Replace the engine-ECU.
Check the trouble symptoms.
NG
Replace the A/T-ECU.
Replace the A/T-ECU.
Check the trouble symptoms.
NG
INSPECTION CHART FOR TROUBLE SYMPTOMS
*: Refer to ’00 PAJERO PININ Workshop Manual (Pub. No. CKRE00E1).
Trouble symptom
Inspection procedure
No.
Reference page
Communication with the MUT-
II
is not possible
1
23-10
Does not move
Does not move forward and reverse
2
23-17*
Does not move forward only
3
23-18*
Does not reverse only
4
23-18*
Malfunction when
shifting
Upshifting does not occur
5
23-19*
shifting
Downshifting does not occur
6
23-20*
Shifting point abnormality
7
23-20*
Upshifting occurs spontaneously
8
23-21*
Incorrect drive gear position
9
23-21*
Large shocks
10
23-22*
Slippage (vibration)
11
23-23*
Lockup malfunction
12
23-24*
Abnormal engine braking
13
23-24*
Electronic circuit
systems
Overdrive switch system
14
23-11
systems
Stop lamp switch system
15
23-11
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