Nissan Maxima. Instruction — part 496
EC-468
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P2122, P2123 APP SENSOR
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK APP 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?
YES
>> GO TO 3.
NO
>> Repair open circuit, short to ground or short to power in
harness or connectors.
3.
CHECK APP SENSOR 1 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 4.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between APP sensor harness connector and ECM harness connector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.
CHECK APP SENSOR
EC-469, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Refer to
ACC-3, "Removal and Installation"
2. Refer to
EC-469, "Special Repair Requirement"
APP sensor
Ground
Voltage (V)
Connector
Terminal
E40
5
Ground
Approx. 5
PBIA9607J
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E40
4
E10
84
Existed
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E40
3
E10
81
Existed
P2122, P2123 APP SENSOR
EC-469
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
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EC
N
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>> INSPECTION END
7.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000010095177
1.
CHECK ACCELERATOR PEDAL POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check the voltage between ECM harness connector terminals
under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Refer to
ACC-3, "Removal and Installation"
.
2. Go to
EC-469, "Special Repair Requirement"
.
>> INSPECTION END
Special Repair Requirement
INFOID:0000000010095178
1.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
Refer to
EC-20, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Requirement"
.
>> GO TO 2.
2.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
>> GO TO 3.
3.
PERFORM IDLE AIR VOLUME LEARNING
EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"
>> END
ECM
Condition
Voltage (V)
Connector
+
–
Terminal
Terminal
E10
81
(APP
sensor 1
signal)
84
(Sensor
ground)
Accelerator
pedal
Fully released
0.5 - 1.0
Fully de-
pressed
4.2 - 4.8
82
(APP
sensor 2
signal)
100
(Sensor
ground)
Fully released
0.25 - 0.5
Fully de-
pressed
2.0 - 2.5
JMBIA1884ZZ
EC-470
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P2127, P2128 APP SENSOR
P2127, P2128 APP SENSOR
Description
INFOID:0000000010095179
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 potentiometer which transform the accelerator pedal
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors sends 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 sig-
nals.
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 engine opera-
tions such as fuel cut.
DTC Logic
INFOID:0000000010095180
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
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 8 V 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:0000000010095181
Regarding Wiring Diagram information, refer to
.
PBIB1741E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P2127
Accelerator pedal posi-
tion sensor 2 circuit low
input
An excessively low voltage from the APP sen-
sor 2 is sent to ECM.
• Harness or connectors
[Accelerator pedal position (APP) sensor
2 circuit is open or shorted.]
[Crankshaft position (CKP) sensor (POS)
circuit is shorted.]
(EVAP control system pressure sensor
circuit is shorted.)
(Refrigerant pressure sensor circuit is
shorted.)
• APP sensor 2
• CKP sensor (POS)
• EVAP control system pressure sensor
• Refrigerant pressure sensor
P2128
Accelerator pedal posi-
tion sensor 2 circuit high
input
An excessively high voltage from the APP sen-
sor 2 is sent to ECM.
P2127, P2128 APP SENSOR
EC-471
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
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K
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A
EC
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P
O
1.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
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?
YES
>> GO TO 6.
NO
>> GO TO 3.
3.
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 4.
NO
>> Repair open circuit.
4.
CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair short to ground or short to power in harness or connectors.
5.
CHECK COMPONENTS
Check the following.
• Crankshaft position sensor (POS) (Refer to
EC-299, "Component Inspection"
• EVAP control system pressure sensor (Refer to
EC-346, "Component Inspection"
.)
• Refrigerant pressure sensor (Refer to
.)
Is the inspection result normal?
YES
>> GO TO 10.
APP sensor
Ground
Voltage (V)
Connector
Terminal
E40
6
Ground
Approx. 5
JMBIA1609ZZ
APP sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
E40
6
E10
87
Existed
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F13
72
Refrigerant pressure sensor
E219
1
76
CKP sensor (POS)
F30
1
E10
87
APP sensor
E40
6
91
EVAP control system pressure sensor
B41
3
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