Mitsubishi Montero Sport (2004+). Manual — part 693
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-337
.
CIRCUIT OPERATION
If a fail-safe is triggered while driving forward, the
PCM flashes the "N" range light once per second
(triggered fail-safe). The PCM does this by switching
battery positive voltage to terminal 121.
.
DTC SET CONDITIONS
If the PCM detects a fail-safe condition, it will attempt
to illuminate the "N" range light. The PCM sends a 12
volts pulse for 60
− 180 ms. If it does not detect a
voltage drop during the pulse, it waits about 60 sec-
onds and pulses 12 volts again for 60
− 180 ms. If
the PCM does no detect the voltage drop before the
ignition switch is turned the "LOCK" (OFF), the PCM
will consider it as an short circuit of the "N" range
light circuit and DTC 56 is set.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Defective "N" range light bulb
• Damaged harness, connector
• Malfunction of the PCM
AC202317
PCM
120
107
119
106
129 130
118
105
117
114115116
126127128
104
111
103
112
108
101102
109110
121122123
124
113
125
CONNECTOR: C-92
C-92 (GR)
AB
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-338
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 "N" range light bulb.
(1) Turn the ignition switch to the "ON" position.
(2) Move the selector lever to "N" position.
• The "N" range light in the combination meter illuminates.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the "N" range light illuminate?
YES : Go to Step 6.
NO : Go to Step 2.
STEP 2. Check the "N" range light bulb.
(1) Remove the combination meter. Refer to GROUP 54A,
Chassis Electrical
− Combination Meters Assembly and
Vehicle Speed Sensor
(2) Check the "N" range light bulb.
Q: Is the bulb in good condition?
YES : Go to Step 3.
NO : Replace the "N" range light bulb.
STEP 3. Check combination meter connectors C-03 and
C-04 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
AC203173
49
48
50
46
45
44
41 42 43
47
31 32
30
29
27
28
26
25
23
22
24
21
CONNECTORS: C-03, C-04
C-03
C-04
C-03
C-04
AB
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-339
STEP 4. Measure the resistance at combination meter
connector C-04.
(1) Disconnect connector C-04 and measure at the harness
side.
(2) Measure the resistance between terminal 31 and ground.
• The measured resistance should be less than 2 ohms.
Q: Is the measured resistance less than 2 ohms?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Check the harness for open circuit or damage
between combination meter connector C-04 terminal 31
and body ground.
Q: Is the harness wire in good condition?
YES : Go to Step 8.
NO : Repair or replace the harness wire.
AC202498
31 32
30
29
27
28
26
25
23
22
24
21
CONNECTOR: C-04
AB
C-04
AC103776AC
C-04 HARNESS
CONNECTOR:
COMPONENT SIDE
AC202498
31 32
30
29
27
28
26
25
23
22
24
21
CONNECTOR: C-04
AB
C-04
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-340
STEP 6. Check combination meter connector C-03,
intermediate connectors C-30, C-96 and PCM connector
C-92 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 7.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
AC202392
4
3
10 11
9
8
5
12
1
6
2
7
22
9 10
20
19
6 7 8
21
17
1516
5
14
12 13
3
2
4
18
11
1
49
48
50
46
45
44
41 42 43
47
CONNECTORS: C-03, C-30, C-96
C-96
C-30
C-03
C-96
C-30
C-03
AB
AC202317
PCM
120
107
119
106
129 130
118
105
117
114115116
126127128
104
111
103
112
108
101102
109110
121122123
124
113
125
CONNECTOR: C-92
C-92 (GR)
AB
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