2001 NISSAN X-TRAIL check engine

DTC P2122, P2123 APP SENSOR
EC-359
[QR25(WITH EURO-OBD)]
C
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MA
EC
4.CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between APP sensor terminal 3 and engine ground.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M61, F41
●Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 75 and APP sensor terminal 5.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M61, F41
●Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.CHECK APP SENSOR
Refer to EC-360, "
Component Inspection" .
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.
9.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Perform EC-39, "
Accelerator Pedal Released Position Learning" .
>>INSPECTION END Continuity should exist.
Continuity should exist.

EC-360
[QR25(WITH EURO-OBD)]
DTC P2122, P2123 APP SENSOR
10. CHECK INTERMITTENT INCIDENT
Refer to EC-115, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS00MQO
ACCELERATOR PEDAL POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform EC-39, "
Accelerator Pedal Released Position Learning" .
3. Turn ignition switch “ON”.
4. Check voltage between ECM terminals 75 (APP sensor 1 sig-
nal), 76 (APP sensor 2 signal) and engine ground under the fol-
lowing conditions.
5. If NG, replace accelerator pedal assembly and go to next step.
6. Perform EC-39, "
Accelerator Pedal Released Position Learning" .
7. Perform EC-39, "
Throttle Valve Closed Position Learning" .
8. Perform EC-39, "
Idle Air Volume Learning" .
Remove and InstallationEBS00MQP
ACCELERATOR PEDAL
Refer to ACC-2, "ACCELERATOR CONTROL SYSTEM" .
Terminal Accelerator pedal Voltage
75
(Accelerator pedal position
sensor 1)Fully released 0.41 - 0.72V
Fully depressed More than 3.2V
76
(Accelerator pedal position
sensor 2)Fully released 0.15 - 0.48V
Fully depressed More than 1.49V
PBIB0561E

EC-364
[QR25(WITH EURO-OBD)]
DTC P2127, P2128 APP SENSOR
Diagnostic Procedure
EBS00MQW
1. RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
>> GO TO 2.
2. CHECK APP SENSOR POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness
connector.
2. Turn ignition switch “ON”.
3. Check voltage between APP sensor terminal 4 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M61, F41
●Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0925E
PBIB0498E
Voltage: Approximately 2.5V
PBIB0915E

DTC P2127, P2128 APP SENSOR
EC-365
[QR25(WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
MA
EC
4.CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between APP sensor terminal 1 and engine ground.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M61, F41
●Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 76 and APP sensor terminal 2.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M61, F41
●Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.CHECK APP SENSOR
Refer to EC-366, "
Component Inspection" .
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.
9.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Perform EC-39, "
Accelerator Pedal Released Position Learning" .
>>INSPECTION END Continuity should exist.
Continuity should exist.

EC-366
[QR25(WITH EURO-OBD)]
DTC P2127, P2128 APP SENSOR
10. CHECK INTERMITTENT INCIDENT
Refer to EC-115, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS00MQX
ACCELERATOR PEDAL POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform EC-39, "
Accelerator Pedal Released Position Learning" .
3. Turn ignition switch “ON”.
4. Check voltage between ECM terminals 75 (APP sensor 1 sig-
nal), 76 (APP sensor 2 signal) and engine ground under the fol-
lowing conditions.
5. If NG, replace accelerator pedal assembly and go to next step.
6. Perform EC-39, "
Accelerator Pedal Released Position Learning" .
7. Perform EC-39, "
Throttle Valve Closed Position Learning" .
8. Perform EC-39, "
Idle Air Volume Learning" .
Remove and InstallationEBS00MQY
ACCELERATOR PEDAL
Refer to ACC-2, "ACCELERATOR CONTROL SYSTEM" .
Terminal Accelerator pedal Voltage
75
(Accelerator pedal position
sensor 1)Fully released 0.41 - 0.72V
Fully depressed More than 3.2V
76
(Accelerator pedal position
sensor 2)Fully released 0.15 - 0.48V
Fully depressed More than 1.49V
PBIB0561E

EC-370
[QR25(WITH EURO-OBD)]
DTC P2135 TP SENSOR
Diagnostic Procedure
EBS00MR5
1. RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
>> GO TO 2.
2. CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT
1. Disconnect electric throttle control actuator harness connector.
2. Turn ignition switch “ON”.
3. Check voltage between electric throttle control actuator terminal
1 and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
3. CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between electric throttle control actuator terminal 5 and engine ground.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0925E
PBIB0497E
Voltage: Approximately 5V
PBIB0082E
Continuity should exist.

EC-372
[QR25(WITH EURO-OBD)]
DTC P2135 TP SENSOR
Component Inspection
EBS00MR6
THROTTLE POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform EC-39, "
Throttle Valve Closed Position Learning" .
3. Turn ignition switch “ON”.
4. Set selector lever to “D” position (A/T models) or “1st” position (M/T models).
5. Check voltage between ECM terminals 73 (TP sensor 1), 74 (TP
sensor 2) and engine ground under the following conditions.
6. If NG, replace electric throttle control actuator and go to the next
step.
7. Perform EC-39, "
Throttle Valve Closed Position Learning" .
8. Perform EC-39, "
Idle Air Volume Learning" .
Remove and InstallationEBS00MR7
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-16, "INTAKE MANIFOLD" .
Terminal Accelerator pedal Voltage
73
(Throttle position sensor 1)Fully released More than 0.36V
Fully depressed Less than 4.75V
74
(Throttle position sensor 2)Fully released Less than 4.75V
Fully depressed More than 0.36V
PBIB0559E

EC-376
[QR25(WITH EURO-OBD)]
DTC P2138 APP SENSOR
Diagnostic Procedure
EBS00MRE
1. RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
>> GO TO 2.
2. CHECK APP SENSOR POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness
connector.
2. Turn ignition switch “ON”.
3. Check voltage between APP sensor terminals 4, 6 and ground
with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M61, F41
●Harness for open or short between ECM and accelerator pedal position sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0925E
PBIB0498E
APP sensor terminal Voltage (V)
4 Approximately 2.5
6 Approximately 5
PBIB0560E