Nissan Titan. Manual — part 266
P0643 SENSOR POWER SUPPLY
EC-365
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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P0643 SENSOR POWER SUPPLY
On Board Diagnosis Logic
INFOID:0000000009886789
This self-diagnosis has the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation Procedure
INFOID:0000000009886790
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich 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
.
Diagnosis Procedure
INFOID:0000000009886791
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.
OK or NG
OK
>> GO TO 2.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0643
0643
Sensor power supply circuit
short
ECM detects a voltage of power source
for sensor is excessively low or high.
• Harness or connectors
(APP sensor 1 circuit is shorted.)
(PSP sensor circuit is shorted.)
(Battery current sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is short-
ed.)
(EVAP control system pressure sensor circuit
is shorted.)
• Accelerator pedal position sensor
• Power steering pressure sensor
• Refrigerant pressure sensor
• EVAP control system pressure sensor
Engine operation condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return
spring.
BBIA0354E
EC-366
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0643 SENSOR POWER SUPPLY
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 terminal 7 and ground with
CONSULT or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 3.
3.
CHECK SENSOR POWER SUPPLY CIRCUITS
Check harness for short to power and short to ground, between the following terminals
OK or NG
OK
>> GO TO 4.
NG
>> Repair short to ground or short to power in harness or connectors.
4.
CHECK COMPONENTS
Check the following.
• EVAP control system pressure sensor (Refer to
EC-320, "Component Inspection"
.)
• Power steering pressure sensor (Refer to
EC-357, "Component Inspection"
• Battery current sensor (Refer to
EC-392, "Component Inspection"
.)
• Refrigerant pressure sensor.
OK or NG
OK
>> GO TO 7.
NG
>> Replace malfunctioning components.
5.
CHECK ACCELERATOR PEEDAL POSITION SENSOR
EC-451, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
BBIA0361E
Voltage: Approximately 5V
JPBIA5715ZZ
ECM terminal
Sensor terminal
Reference Wiring Diagram
48
EVAP control system pressure sensor terminal 3
49
Refrigerant pressure sensor terminal 1
Battery current sensor terminal 1
68
Power steering pressure sensor terminal 1
90
APP sensor terminal 7
P0643 SENSOR POWER SUPPLY
EC-367
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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6.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal position assembly.
2. Perform
EC-128, "Accelerator Pedal Released Position Learning"
.
3. Perform
EC-128, "Throttle Valve Closed Position Learning"
4. Perform
EC-129, "Idle Air Volume Learning"
.
>> INSPECTION END
7.
CHECK INTERMITTENT INCIDENT
GI-39, "How to Check Terminal"
GI-42, "Intermittent Incident"
>> INSPECTION END
EC-368
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0850 PNP SWITCH
P0850 PNP SWITCH
Component Description
INFOID:0000000009886792
When the gear position is P or N, transmission range switch is ON.
TCM detects the position because the continuity of the line (the ON signal) exists.
Then the TCM sends the PNP signal to the ECM via combination meter.
On Board Diagnosis Logic
INFOID:0000000009886793
DTC Confirmation Procedure
INFOID:0000000009886794
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.
WITH CONSULT
1. Turn ignition switch ON.
2. Select “P/N POSI SW” in “DATA MONITOR” mode with CONSULT. Then check the “P/N POSI SW” signal
under the following conditions.
If NG, go to
If OK, go to following step.
3. Select “DATA MONITOR” mode with CONSULT.
4. Start engine and warm it up to normal operating temperature.
5. Maintain the following conditions for at least 60 consecutive seconds.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to
Overall Function Check
INFOID:0000000009886795
Use this procedure to check the overall function of the park/neutral position (PNP) signal circuit. During this
check, a 1st trip DTC might not be confirmed.
WITH GST
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0850
0850
Park/neutral position
switch
The park/neutral position (PNP) signal is not
changed in the process of engine starting and
driving.
• Harness or connectors
[The park/neutral position (PNP) signal
circuit is open or shorted.]
• Combination meter
• TCM
Position (Selector lever)
Known-good signal
N or P position
ON
Except the above position
OFF
ENG SPEED
1,000 - 6,375 rpm
COOLAN TEMP/S
More than 70
°C (158°F)
B/FUEL SCHDL
2.0 - 31.8 msec
VHCL SPEED SE
More than 64 km/h (40 MPH)
Selector lever
Suitable position
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