Nissan Xterra. Instruction — part 330
EC-446
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P2135 TP SENSOR
2. Perform
EC-125, "Accelerator Pedal Released Position Learning"
3. Perform
EC-125, "Throttle Valve Closed Position Learning"
4. Perform
EC-125, "Idle Air Volume Learning"
.
>> INSPECTION END
7.
CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between electric throttle control actuator terminal 4 and ECM terminal 19.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK THROTTLE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 22 and electric throttle control actuator terminal 1, ECM
terminal 23 and electric throttle control actuator terminal 3.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 9.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK THROTTLE POSITION SENSOR
EC-446, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. Refer to
2. Perform
EC-125, "Throttle Valve Closed Position Learning"
3. Perform
EC-125, "Idle Air Volume Learning"
.
>> INSPECTION END
11.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000009484203
THROTTLE POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform
EC-125, "Throttle Valve Closed Position Learning"
3. Turn ignition switch ON.
4. Set selector lever to D (A/T), 1st (M/T).
Continuity should exist.
Continuity should exist.
P2135 TP SENSOR
EC-447
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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5. Check voltage between ECM terminals 22 (TP sensor 1 signal), 23 (TP sensor 2 signal) and ground under
the following conditions.
6. If NG, replace electric throttle control actuator and go to the next step.
7. Perform
EC-125, "Throttle Valve Closed Position Learning"
8. Perform
EC-125, "Idle Air Volume Learning"
.
Terminal
Accelerator pedal
Voltage
22
(Throttle position sensor 1)
Fully released
More than 0.36V
Fully depressed
Less than 4.75V
23
(Throttle position sensor 2)
Fully released
Less than 4.75V
Fully depressed
More than 0.36V
EC-448
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P2138 APP SENSOR
P2138 APP SENSOR
Component Description
INFOID:0000000009484204
The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometers which transform the accelerator pedal
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of
the accelerator pedal and feed the voltage signals to the ECM. The
ECM judges the current opening angle of the accelerator pedal from
these signals and controls the throttle control motor based on these
signals.
Idle position of the accelerator pedal is determined by the ECM
receiving the signal from the accelerator pedal position sensor. The ECM uses this signal for the engine oper-
ation such as fuel cut.
On Board Diagnosis Logic
INFOID:0000000009484205
This self-diagnosis has the one trip detection logic.
NOTE:
If DTC P2138 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MIL illuminates.
DTC Confirmation Procedure
INFOID:0000000009484206
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
1. Start engine and let it idle for 1 second.
2. Check DTC.
3. If DTC is detected, go to
.
PBIB1741E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P2138
2138
Accelerator pedal posi-
tion sensor circuit range/
performance
Rationally incorrect voltage is sent to ECM
compared with the signals from APP sensor 1
and APP sensor 2.
• Harness or connector
(The APP sensor 1 and 2 circuit is open
or shorted.)
(The TP sensor circuit is shorted.)
• Accelerator pedal position sensor
(APP sensor 1 and 2)
• Electric throttle control actuator
(TP sensor 1 and 2)
Engine operating condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10
degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal condition.
So, the acceleration will be poor.
P2138 APP SENSOR
EC-449
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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Diagnosis Procedure
INFOID:0000000009484207
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
3. Check voltage between APP sensor terminals 2 and ground with CONSULT 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 APP SENSOR 2 POWER SUPPLY CIRCUIT-I
Check voltage between APP sensor terminal 1 and ground with CONSULT or tester.
1.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 4.
4.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between APP sensor terminal 1 and ECM terminal 103.
Refer to wiring diagram.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit.
BBIA0539E
Voltage: Approximately 5V
BBIA0556E
Voltage: Approximately 5V
Continuity should exist.
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