Mitsubishi Montero (2004+). Manual — part 939
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-331
.
CIRCUIT OPERATION
PCM (terminal 58) receives battery positive voltage
from the battery.
.
COMMENT
If shifting does not occur while driving and no diag-
nostic trouble codes are output, a malfunction of the
transmission range switch, or PCM may exist.
.
TROUBLESHOOTING HINTS (THE MOST LIKELY
CAUSES FOR THIS CASE:)
• Malfunction of transmission range switch
• Damaged harness, connector
• Malfunction of the PCM
DIAGNOSIS
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
STEP 1. Check the vehicle acceleration.
Q: Does the vehicle accelerate poorly (transmission stays
in 3rd gear) when starting from a stop with the selector
lever in "D" range?
YES : Go to Step 2.
NO : Go to Step 5.
AC204681AD
CONNECTOR: D-133
D-133 (GR)
31 32
33 34
35 36 37 38 39 40 41 42 43
44 45 46 47 48 49
50 51
52 53
54 55 56
57 58
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-332
STEP 2. Measure the backup power supply voltage at PCM
connector D-133 by backprobing.
(1) Do not disconnect connector D-133.
(2) Measure the voltage between terminal 58 and ground by
backprobing.
• The voltage should measure battery positive voltage.
Q: Is the measured voltage battery positive voltage?
YES : Go to Step 5.
NO : Go to Step 3.
AC204681AD
CONNECTOR: D-133
D-133 (GR)
31 32
33 34
35 36 37 38 39 40 41 42 43
44 45 46 47 48 49
50 51
52 53
54 55 56
57 58
AC204918 DM
D-133 HARNESS CONNECTOR :
HARNESS SIDE
50
58
43
36 37
35
44
52
45
53
32
31
42
38 39 40 41
46
55
48
54
51
47
49
56
33 34
57
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-333
STEP 3. Check intermediate connector A-03 and PCM
connector D-133 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES : Go to Step 4.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
. Then retest the system.
AC204167
CONNECTOR : A-03
AT
A-03 (B)
6
12
5
3 4
2
1
9 10
8
7
11
AC204681AD
CONNECTOR: D-133
D-133 (GR)
31 32
33 34
35 36 37 38 39 40 41 42 43
44 45 46 47 48 49
50 51
52 53
54 55 56
57 58
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-334
STEP 4. Check the harness for open circuit between PCM
connector D-133 terminal 58 and fusible link.
Q: Is the harness wire in good condition?
YES : Go to Step 5.
NO : Repair or replace the harness wire.
STEP 5. Using scan tool MB991958, check data list item 61:
Transmission Range Switch.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode.
• Item 61: Transmission Range Switch.
• Move the selector lever to "P," "R," "N," "D" and sport
mode positions and confirm that the selected trans-
mission ranges match the positions shown on scan
tool MB991958 (Sport mode is indicated as "D" on
scan tool MB991958).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES : Check for the symptom. If the symptom is not
eliminated, replace the PCM.
NO : Refer to
, DTCs 27, 28:
Transmission Range Switch System.
AC204681AD
CONNECTOR: D-133
D-133 (GR)
31 32
33 34
35 36 37 38 39 40 41 42 43
44 45 46 47 48 49
50 51
52 53
54 55 56
57 58
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
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