Infiniti QX56 (Z62). Manual — part 625
EC-478
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P2138 APP SENSOR
P2138 APP SENSOR
DTC Logic
INFOID:0000000006217981
DTC DETECTION LOGIC
NOTE:
If DTC P2138 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
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 8 V or more at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine and let it idle for 1 second.
2.
Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006217982
1.
CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT
1.
Disconnect accelerator pedal position (APP) sensor harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between APP sensor harness connector and ground.
Is the inspection result normal?
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P2138
APP SENSOR
(Accelerator pedal position
sensor circuit range/perfor-
mance)
Rationally incorrect voltage is
sent to ECM compared with
the signals from APP sensor 1
and APP sensor 2.
• Harness or connectors
(APP sensor 1 or 2 circuit is open or shorted.)
[CKP sensor circuit is shorted.]
[CMP sensor (bank 1) circuit is shorted.]
(Battery current sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is shorted.)
(EVAP control system pressure sensor circuit is short-
ed.)
• Accelerator pedal position sensor (APP sensor 1 or 2)
• Crankshaft position sensor
• Camshaft position sensor (bank 1)
• Refrigerant pressure sensor
• Battery current sensor
• EVAP control system pressure sensor
APP sensor
Ground
Voltage (V)
Connector
Terminal
E110
(Without ICC)
2
Ground
Approx. 5
E67
(With ICC)
12
P2138 APP SENSOR
EC-479
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
• Loose or poor connection for each connector and harness
• Harness for open or short between ECM and APP sensor
>> Repair open circuit, short to ground or short to power in harness or connectors.
3.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch ON.
2.
Check the voltage between APP sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 4.
4.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between APP sensor harness connector and ECM harness connector.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between ECM and accelerator pedal position sensor
• Loose or poor connection for each connector and harness
>> Repair open circuit.
6.
CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
APP sensor
Ground
Voltage (V)
Connector
Terminal
E110
(Without ICC)
1
Ground
Approx. 5
E67
(With ICC)
9
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E110
(Without ICC)
1
E80
131
Existed
E67
(With ICC)
9
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F110
76
Crankshaft position sensor
F74
1
77
Camshaft position sensor (bank 1)
F84
1
EC-480
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P2138 APP SENSOR
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair short to ground or short to power in harness or connectors.
7.
CHECK COMPONENTS
Check the following.
• Crankshaft position sensor (Refer to
EC-301, "Component Inspection (Crankshaft Position Sensor)"
.)
• Camshaft position sensor (bank 1) (Refer to
EC-306, "Component Inspection (Camshaft Position Sensor)"
.)
• Refrigerant pressure sensor (Refer to
EC-520, "Component Function Check"
.)
• EVAP control system pressure sensor (Refer to
EC-335, "Component Inspection (EVAP Control System
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Replace malfunctioning component.
8.
CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between APP sensor harness connector and ECM harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 9.
9.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between ECM and accelerator pedal position sensor
• Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
10.
CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check the continuity between APP sensor harness connector and ECM harness connector.
E80
133
Battery current sensor
E63
2
Refrigerant pressure sensor
E77
1
EVAP control system pressure sen-
sor
C17
3
131
APP sensor (Without ICC)
E110
1
APP sensor (with ICC)
E67
9
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E110
(Without ICC)
4
E80
140
Existed
5
129
E67
(With ICC)
11
E80
140
Existed
8
129
P2138 APP SENSOR
EC-481
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
2.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 11.
11.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between ECM and accelerator pedal position sensor
• Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
12.
CHECK APP SENSOR
EC-481, "Component Inspection (Accelerator Pedal Position Sensor)"
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> GO TO 13.
13.
REPLACE ACCELERATOR PEDAL ASSEMBLY
Replace accelerator pedal assembly. Refer to
ACC-3, "MODELS WITHOUT DISTANCE CONTROL ASSIST
SYSTEM : Removal and Installation"
(Without distance control assist system) or
DISTANCE CONTROL ASSIST SYSTEM : Removal and Installation"
(With distance control assist system).
>> INSPECTION END
14.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection (Accelerator Pedal Position Sensor)
INFOID:0000000006217983
1.
CHECK ACCELERATOR PEDAL POSITION SENSOR
1.
Turn ignition switch OFF.
2.
Reconnect all harness connectors disconnected.
3.
Turn ignition switch ON.
4.
Check the voltage ECM harness connector terminals under the following conditions.
Is the inspection result normal?
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E110
(Without ICC)
3
E80
136
Existed
6
126
E67
(With ICC)
10
E80
136
Existed
7
126
ECM
Condition
Voltage (V)
Connector
+
–
Terminal
Terminal
E80
136 (APP sensor 1)
140
Accelerator pedal
Fully released
0.65 - 0.87
Fully depressed
4.3 - 4.8
126 (APP sensor 2)
129
Fully released
0.28 - 0.48
Fully depressed
2.0 - 2.5
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