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