Mitsubishi Montero (2002-2004). Manual — part 729
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-613
STEP 8. Using scan tool MB991502, read the diagnostic
trouble code (DTC).
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P2123 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P2126: Accelerator Pedal Position Sensor (Sub) Circuit Range/Performance Problem
.
Accelerator Pedal Position Sensor (Sub) Circuit
Range/Performance Problem Circuit
• Refer to, DTC P2127 − Accelerator Pedal Posi-
• Refer to GROUP 13A, INSPECTION PROCE-
DURE 33
− Accelerator Pedal Position Switch
Circuit
.
CIRCUIT OPERATION
• Refer to, DTC P2127 − Accelerator Pedal Posi-
• Refer to GROUP 13A, INSPECTION PROCE-
DURE 33
− Accelerator Pedal Position Switch
Circuit
.
TECHNICAL DESCRIPTION
• PCM checks the APS (sub) output signal charac-
teristics for abnormal conditions.
.
DTC SET CONDITIONS
Check Condition
• Ignition switch "ON" position.
• Accelerator pedal position switch: ON
• APS (main) failure detected.
Judgement Criteria
• APS (sub) output voltage is 2.5 volts or higher for
1 second.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• APS failed or maladjusted.
• Open or shorted APS (sub) circuit, or loose con-
nector.
• Accelerator pedal position switch failed or malad-
justed.
• Open or shorted accelerator pedal position switch
circuit, or loose connector.
• PCM failed.
ACX01539
16-PIN
MB991502
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-614
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
STEP 1. Check connector D-138 at accelerator pedal
position sensor and accelerator pedal position switch for
damage.
Q: Is the connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
STEP 2. Check the accelerator pedal position sensor.
(1) Disconnect the accelerator pedal position sensor connector
D-138.
(2) Measure resistance between terminal No. 1 and No. 2 and
between terminal No. 7 and No. 8.
Standard value: 3.5
− 6.5 kiloohms
(3) Measure resistance between terminal No. 2 and No. 3 and
between terminal No. 6 and No. 8.
(4) Move the accelerator pedal from the idle position to the full-
open position.
• Resistance value changes in accordance with the accel-
erator pedal depression smoothly.
Q: Is the resistance normal?
YES : YES: Go to Step 3.
NO : Replace the accelerator pedal position sensor.
Then go to Step 11.
AK200945
3
4
5
1
2
8
6
7
AB
CONNECTOR: D-138
HARNESS
CONNECTOR:
COMPONENT SIDE
D-138(GR)
AK200945
3
4
5
1
2
8
6
7
AB
CONNECTOR: D-138
HARNESS
CONNECTOR:
COMPONENT SIDE
D-138(GR)
6 7 8
1 2 3 4 5
AK201450
ACCELERATOR PEDAL
POSITION SENSOR
SIDE CONNECTOR
AB
6 7 8
1 2 3 4 5
AK201451
ACCELERATOR PEDAL
POSITION SENSOR
SIDE CONNECTOR
AB
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-615
STEP 3. Check the continuity at accelerator pedal position
sensor harness side connector D-138.
(1) Disconnect the connector D-138 and measure at the
harness side.
(2) Measure the continuity between terminal No. 7 and ground.
• Should be less than 2 ohms.
Q: Is the continuity normal?
YES : Go to Step 7.
NO : Go to Step 4.
STEP 4. Check connector D-135 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
AK200945
3
4
5
1
2
8
6
7
AB
CONNECTOR: D-138
HARNESS
CONNECTOR:
COMPONENT SIDE
D-138(GR)
3
4
5
1
2
8
6
7
AK201455
B-138 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
AK200947
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-616
STEP 5. Check for harness damage between accelerator
pedal position sensor connector D-138 (terminal No. 7) and
PCM connector D-135 (terminal No. 96).
Q: Is the harness wire in good condition?
YES : Go to Step 6.
NO : Repair it. Then go to Step 11.
STEP 6. Using scan tool MB991502, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P2126 set?
YES : Replace the PCM.Then go to Step 11.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points
AK200945
3
4
5
1
2
8
6
7
AB
CONNECTOR: D-138
HARNESS
CONNECTOR:
COMPONENT SIDE
D-138(GR)
AK200947
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
ACX01539
16-PIN
MB991502
AC
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