Mitsubishi Pajero Pinin. Manual — part 176
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-14
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.
D
Malfunction of harness or connector
D
Malfunction of the engine-ECU
D
Malfunction of the A/T-ECU
MUT-
II
Self-Diag code
D
Is the diagnosis code No.61 output?
NO
YES
Check the following connectors:
<L.H. vehicles> C-19, C-25, D-34, D-04
<R.H. vehicles> C-19, C-26, D-34, D-04
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
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-15
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
Inspection procedure
No.
Reference page
Communication with the MUT-
II
is not possible
1
23-16
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
Inhibitor switch system
14
23-25
systems
Overdrive switch system
15
23-25
Stop lamp switch system
16
23-26
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-16
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.
D
Malfunction of self-diagnosis system
D
Malfunction of A/T-ECU power circuit
D
Malfunction of A/T-ECU earth circuit
D
Malfunction of A/T-ECU
D
Malfunction of harness and connector
Is communication with other systems
possible using the MUT-
II
?
No
Check and repair the self-diagnosis
system with the MUT-
II
Yes
Measure at A/T-ECU connector D-04
D
Disconnect the connector and
measure at the harness side.
D
Voltage between terminals (9) and
(24) and the earth
OK: System voltage
D
Continuity between terminal (25)
and earth
OK: Continuity
OK
Check the following connectors:
<L.H. drive vehicles> D-04, D-34, C-37,
C-70, C-35
<R.H. drive vehicles> D-04, D-34, C-39,
C-70, C-35
NG
Repair
OK
Check the trouble symptoms.
NG
Replace the A/T-ECU.
NG
Check the following connectors:
<L.H. drive vehicles> D-02, C-24, C-78,
C-74, D-34, C-68, C-72
<R.H. drive vehicles> D-02, C-26, C-78,
C-74, D-34, C-68, C-72
NG
Repair
OK
Check the trouble symptoms.
NG
D
Check and repair the harness wire
between the A/T-ECU and the
power supply.
D
Check and repair the harness wire
between the A/T-ECU and the earth.
Check the trouble symptoms
NG
Replace the A/T-ECU.
AUTOMATIC TRANSMISSION –
Troubleshooting <A/T>
23-17
INSPECTION PROCEDURE 2
Does not move forward and reverse
Probable cause
When the engine is idling, the vehicle does not move forward and reverse even
if the selector lever is shifted from N to D, 2, L or R positionj. In such cases, the
cause is probably abnormal line pressure, or a malfunction of the transmission control
cable, torque converter, oil pump, parking mechanism or the power train.
D
Malfunction of transmission control cable
D
Abnormal line pressure
D
Malfunction of power train
D
Malfunction of oil pump
D
Malfunction of valve body
D
Malfunction of parking mechanism
D
Malfunction of torque converter
D
Malfunction of A/T-ECU
L
: Refer to the Transmission Workshop Manual.
OK
Replace the torque converter.
L
NG
Check and repair or replace the oil
pump.
L
Check the trouble symptoms
Is abnormal noise generated in D
range?
Yes
Is the source of the abnormal noise
the torque converter or thetransmis-
sion?
Replace the torque converter
L
Torque
converter
No
Transmission
Check the power train.
L
D
Disassemble the transmission,
check the condition of the planetary
gear and other parts, and repair or
replace any parts as necessary.
Can the propeller shaft be turned by
hand in all ranges except P range?
No
Malfunction of parking mechanism
L
Yes
Check the line pressure.
(Refer to P. 23-45.)
NG
Repair or replace the valve body.
L
Transmission control cable assembly
check
NG
NG
OK
OK
Check the engine control system, igni-
tion system, fuel system, engine me-
chanical system.
Repair, replace
Repair, replace
Check the trouble symptoms.
NG
Replace the A/T-ECU.
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