Mitsubishi Montero (2004+). Manual — part 880
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-95
TROUBLESHOOTING HINTS (THE MOST LIKELY
CAUSES FOR THIS CODE TO BE SET:)
• Malfunction of the output shaft speed sensor
• Malfunction of the output shaft
• 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. Using scan tool MB991958, check data list item 23:
Output Shaft Speed Sensor.
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) Start the engine.
(3) Set scan tool MB991958 to the data reading mode.
• Item 23: Output Shaft Speed Sensor.
• When driving at constant speed of 50 km/h (31
mph), the display should be "1,400
− 1,700 r/min"
(Gear range: 4th gear).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
.
NO : Go to Step 2.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-96
STEP 2. Measure the power supply voltage at output shaft
speed sensor connector C-02.
(1) Disconnect connector C-02 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 3 and ground.
• The voltage should measure battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES : Go to Step 5.
NO : Go to Step 3.
AC204746
CONNECTOR : C-02
C-02 (GR)
AB
1 2 3
AC204918 AH
C-02 HARNESS CONNECTOR :
COMPONENT SIDE
1
2
3
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-97
STEP 3. Check joint connector D-01, junction block
connector D-212 and intermediate connector E-11 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
AC204170
CONNECTOR : D-01
CD
9 10
8
6 7
31 32
30
29
18 19 20 21
5
4
2
1
3
27
26
24
23
25
12 13 14 15 16 17
28
11
22
33
AC204173
CONNECTOR : D-212
AZ
3
10
9
4
11
8
7
1
5
2
6
JUNCTION BLOCK
(FRONT VIEW)
AC204176
CONNECTOR : E-11
AZ
3
10
16
9
7 8
6
1
4
2
5
11
14
1213
15
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-98
STEP 4. Check the harness for open circuit or short circuit
to ground between output shaft speed sensor connector
C-02 terminal 3 and the junction block connector D-212
terminal 9.
Q: Is the harness wire in good condition?
YES : Go to Step 5.
NO : Repair or replace the harness wire.
STEP 5. Measure the PCM to speed sensor output voltage
at the output shaft speed sensor connector C-02.
(1) Disconnect connector C-02 from the speed sensor and
measure voltage at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 2 and ground.
• The voltage should measure between 4.5 and 4.9 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?
YES : Go to Step 11.
NO : Go to Step 6.
AC204746
CONNECTOR : C-02
C-02 (GR)
AB
1 2 3
AC204173
CONNECTOR : D-212
AZ
3
10
9
4
11
8
7
1
5
2
6
JUNCTION BLOCK
(FRONT VIEW)
AC204746
CONNECTOR : C-02
C-02 (GR)
AB
1 2 3
AC204918 AG
C-02 HARNESS CONNECTOR :
COMPONENT SIDE
1
2
3
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