DTC P2138 APP SENSOR
DTC P2138 APP SENSOR PFP:18002
Component Description ABS00CYL
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.
PBIB1741E
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.
CONSULT-II Reference Value in Data Monitor Mode ABS00CYM
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
Ignition switch: ON Accelerator pedal: Fully released 0.5 - 1.0V
ACCEL SEN 1
(Engine stopped) Accelerator pedal: Fully depressed 4.0 - 4.7V
Ignition switch: ON Accelerator pedal: Fully released 0.3 - 1.2V
ACCEL SEN 2*
(Engine stopped) Accelerator pedal: Fully depressed 3.9 - 4.8V
Ignition switch: ON Accelerator pedal: Fully released ON
CLSD THL POS
(Engine stopped) Accelerator pedal: Slightly depressed OFF
*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, they differs from ECM terminal voltage signal.
On Board Diagnosis Logic ABS00CYN
This self-diagnosis has the one trip detection logic.
NOTE:
If DTC P2138 is displayed with DTC P1229, first perform the trouble diagnosis for DTC P1229. Refer to
EC-499 .
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
Harness or connector
(The APP sensor 1 and 2 circuit is open
Accelerator pedal posi- or shorted.)
Rationally incorrect voltage is sent to ECM (The TP sensor circuit is shorted.)
P2138 tion sensor circuit
compared with the signals from APP sensor 1
2138 range/performance Accelerator pedal position sensor
and APP sensor 2.
problem (APP sensor 1 and 2)
Electric throttle control actuator
(TP sensor 1 and 2)
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
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.
Revision: 2005 March EC-578 2005 X-Trail
DTC P2138 APP SENSOR
DTC Confirmation Procedure ABS00CYO
A
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION: EC
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
WITH CONSULT-II
1. Turn ignition switch ON. C
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for 1 second.
D
4. If DTC is detected, go to EC-582, "Diagnostic Procedure" .
SEF058Y
WITH GST G
Follow the procedure “WITH CONSULT-II” above.
Revision: 2005 March EC-579 2005 X-Trail
DTC P2138 APP SENSOR
Wiring Diagram ABS00CYP
TBWB0089E
Revision: 2005 March EC-580 2005 X-Trail
DTC P2138 APP SENSOR
Specification data are reference values and are measured between each terminal and ground.
CAUTION: A
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMI- EC
WIRE
NAL ITEM CONDITION DATA (DC Voltage)
COLOR
NO.
Sensor power supply C
47 R (Throttle position sen- [Ignition switch: ON] Approximately 5V
sor)
Sensor ground [Engine is running]
D
82 R/Y (Accelerator pedal posi- Warm-up condition Approximately 0V
tion sensor 1) Idle speed
Sensor ground [Engine is running] E
83 L (Accelerator pedal posi- Warm-up condition Approximately 0V
tion sensor 2) Idle speed
Sensor power supply F
90 R (Accelerator pedal posi- [Ignition switch: ON] Approximately 5V
tion sensor 1)
Sensor power supply G
91 BR/Y (Accelerator pedal posi- [Ignition switch: ON] Approximately 5V
tion sensor 2)
[Ignition switch: ON]
H
Engine stopped 0.15 - 0.6V
Accelerator pedal posi- Accelerator pedal: Fully released
98 B/W
tion sensor 2 [Ignition switch: ON] I
Engine stopped 1.95 - 2.4V
Accelerator pedal: Fully depressed
[Ignition switch: ON] J
Engine stopped 0.5 - 1.0V
Accelerator pedal posi- Accelerator pedal: Fully released
106 W K
tion sensor 1 [Ignition switch: ON]
Engine stopped 3.9 - 4.7V
Accelerator pedal: Fully depressed
L
Revision: 2005 March EC-581 2005 X-Trail
DTC P2138 APP SENSOR
Diagnostic Procedure ABS00D8W
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.
Refer to EC-162, "Ground Inspection" .
PBIB2353E
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
Revision: 2005 March EC-582 2005 X-Trail
DTC P2138 APP SENSOR
2. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT A
1. Disconnect accelerator pedal position (APP) sensor harness
connector.
2. Turn ignition switch ON. EC
D
PBIB2342E
3. Check voltage between APP sensor terminal 6 and ground with E
CONSULT-II or tester.
Voltage: Approximately 5V
F
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors. G
PBIB0914E H
3. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
Check voltage between APP sensor terminal 4 and ground with I
CONSULT-II or tester.
Voltage: Approximately 5V
J
OK or NG
OK >> GO TO 8.
NG >> GO TO 4. K
L
PBIB0915E
4. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
M
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between APP sensor terminal 4 and ECM terminal 91.
Refer to Wiring Diagram.
Continuity should exist.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace open circuit.
Revision: 2005 March EC-583 2005 X-Trail
DTC P2138 APP SENSOR
5. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals.
ECM terminal Sensor terminal Reference Wiring Diagram
47 Electric throttle control actuator terminal 1 EC-572
91 APP sensor terminal 4 EC-564
OK or NG
OK >> GO TO 6.
NG >> Repair short to ground or short to power in harness or connectors.
6. CHECK THROTTLE POSITION SENSOR
Refer to EC-577, "Component Inspection" .
OK or NG
OK >> GO TO 12.
NG >> GO TO 7.
7. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. Perform EC-88, "Throttle Valve Closed Position Learning" .
3. Perform EC-88, "Idle Air Volume Learning" .
>> INSPECTION END
8. CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between the following;
APP sensor terminal 3 and ECM terminal 82,
APP sensor terminal 1 and ECM terminal 83.
Refer to Wiring Diagram.
Continuity should exist.
4. 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 APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between the following;
APP sensor terminal 5 and ECM terminal 106,
APP sensor terminal 2 and ECM terminal 98.
Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 10.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
Revision: 2005 March EC-584 2005 X-Trail
DTC P2138 APP SENSOR
10. CHECK APP SENSOR
A
Refer to EC-585, "Component Inspection" .
OK or NG
OK >> GO TO 12. EC
NG >> GO TO 11.
11. REPLACE ACCELERATOR PEDAL ASSEMBLY C
1. Replace the accelerator pedal assembly.
2. Perform EC-88, "Accelerator Pedal Released Position Learning" .
D
3. Perform EC-88, "Throttle Valve Closed Position Learning" .
4. Perform EC-88, "Idle Air Volume Learning" .
E
>> INSPECTION END
12. CHECK INTERMITTENT INCIDENT F
Refer to EC-154, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
G
>> INSPECTION END
Component Inspection ABS00CYR
ACCELERATOR PEDAL POSITION SENSOR H
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check voltage between ECM terminals 106 (APP sensor 1 sig- I
nal), 98 (APP sensor 2 signal) and ground under the following
conditions.
Terminal Accelerator pedal Voltage
J
106 Fully released 0.5 - 1.0V
(Accelerator pedal position
sensor 1) Fully depressed 3.9 - 4.7V K
98 Fully released 0.15 - 0.6V
(Accelerator pedal position
sensor 2) Fully depressed 1.95 - 2.4V L
MBIB0023E
4. If NG, replace accelerator pedal assembly and go to the next
step.
5. Perform EC-88, "Accelerator Pedal Released Position Learning" . M
6. Perform EC-88, "Throttle Valve Closed Position Learning" .
7. Perform EC-88, "Idle Air Volume Learning" .
Remove and Installation ABS00CYS
ACCELERATOR PEDAL
Refer to ACC-3, "ACCELERATOR CONTROL SYSTEM" .
Revision: 2005 March EC-585 2005 X-Trail
IGNITION SIGNAL
IGNITION SIGNAL PFP:22448
Component Description ABS00CYT
IGNITION COIL & POWER TRANSISTOR
The ignition signal from the ECM is sent to and amplified by the
power transistor. The power transistor turns ON and OFF the ignition
coil primary circuit. This ON/OFF operation induces the proper high
voltage in the coil secondary circuit.
PBIB2337E
Revision: 2005 March EC-586 2005 X-Trail
