2003 NISSAN TEANA Power

DTC P1229 SENSOR POWER SUPPLY
EC-233
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DTC P1229 SENSOR POWER SUPPLYPFP:16119
On Board Diagnosis LogicBBS005GP
This self-diagnosis has the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MI lights up.
DTC Confirmation ProcedureBBS005GQ
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:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for 1 second.
4. If DTC is detected, go to EC-236, "
Diagnostic Procedure" .
WITHOUT CONSULT-II
1. Start engine and let it idle for 1 seconds.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3. Perform Diagnostic Test Mode II (Self-diagnostic results) with ECM.
4. If DTC is detected, go to EC-236, "
Diagnostic Procedure" .
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1229
1229Sensor power supply circuit
shortECM 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.)
(Refrigerant pressure sensor circuit is
shorted.)

Accelerator pedal position sensor
(APP sensor 1)

Power steering pressure sensor

Refrigerant 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.
SEF058Y

EC-234
[QR]
DTC P1229 SENSOR POWER SUPPLY

Wiring DiagramBBS005GR
TBWM1497E

DTC P1229 SENSOR POWER SUPPLY
EC-235
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Specification data are reference values and are measured between each terminal and ground.
CAUTION:
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-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
46 BR/WSensor power supply
(Refrigerant pressure sen-
sor)[Ignition switch: ON]Approximately 5V
65 LG/BSensor power supply
(Power steering pressure
sensor)[Ignition switch: ON]Approximately 5V
82 BSensor ground
(Accelerator pedal position
sensor 1)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
83 GSensor ground
(Accelerator pedal position
sensor 2)[Engine is running]

Warm-up condition

Idle speedApproximately 0V
90 R/WSensor power supply
(Accelerator pedal position
sensor 1)[Ignition switch: ON]Approximately 5V
91 PSensor power supply
(Accelerator pedal position
sensor 2)[Ignition switch: ON]Approximately 5V
98 LGAccelerator pedal position
sensor 2[Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully released0.2 - 0.55V
[Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully depressed1.85 - 2.4V
106 WAccelerator pedal position
sensor 1[Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully released0.4 - 1.1V
[Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully depressed3.7 - 4.8V

EC-236
[QR]
DTC P1229 SENSOR POWER SUPPLY

Diagnostic ProcedureBBS005GS
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body.
Refer to E C - 111 , "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2. 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 voltage between APP sensor terminal 2 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 3.
PBIB2160E
PBIB2467E
Voltage: Approximately 5V
PBIB2478E

DTC P1229 SENSOR POWER SUPPLY
EC-237
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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.

Refrigerant pressure sensor (Refer to AT C - 8 3 , "COMPONENT INSPECTION" ).

Power steering pressure sensor (Refer to EC-189, "Component Inspection" .)
OK or NG
OK >> GO TO 7.
NG >> Replace malfunctioning component.
5. CHECK APP SENSOR
Refer to EC-264, "
Component Inspection" .
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Perform EC-47, "
Accelerator Pedal Released Position Learning" .
3. Perform EC-47, "
Throttle Valve Closed Position Learning" .
4. Perform EC-47, "
Idle Air Volume Learning" .
>>INSPECTION END
7. CHECK INTERMITTENT INCIDENT
Refer to EC-105, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
ECM terminal Sensor terminal Reference Wiring Diagram
90 APP sensor terminal 2EC-234
46 Refrigerant pressure sensor terminal 1EC-340
65 PSP sensor terminal 3EC-186

EC-240
[QR]
DTC P1706 PNP SWITCH

Specification data are reference values and are measured between each terminal and ground.
CAUTION:
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.
Diagnostic ProcedureBBS005GY
1. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I
1. Turn ignition switch OFF.
2. Disconnect “unified meter and A/C amp.” harness connector M42.
3. Turn ignition switch ON.
4. Check voltage between “unified meter and A/C amp.” terminals
32, 33 and ground with CONSULT-II or tester under the follow-
ing conditions.
OK or NG
OK >> GO TO 8.
NG >> GO TO 2.
2. CHECK PNP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect PNP switch harness connector.
3. Turn ignition switch ON.
4. Check voltage between PNP switch terminal 3 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
102 G/W PNP switch[Ignition switch: ON]

Shift lever: P or NApproximately 0V
[Ignition switch: ON]

Except above positionBATTERY VOLTAGE
(11 - 14V)
Condition (Shift position)Voltage
Te r m i n a l 3 2 Te r m i n a l 3 3
P positionBATTERY VOLTAGE
(11 - 14V)Approximately 0 V
N position Approximately 0 VBATTERY VOLTAGE
(11 - 14V)
Except the above position Approximately 0 V Approximately 0 V
PBIB1675E
Voltage: Battery voltage
PBIB1881E

DTC P1706 PNP SWITCH
EC-241
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3. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors M55, F102

Fuse block (J/B) connector M1

10A fuse

Harness for open or short between PNP switch and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I
1. Turn ignition switch OFF.
2. Check harness continuity between PNP switch terminal 7 and “unified meter and A/C amp.” terminal 32,
PNP switch terminal 9 and “unified meter and A/C amp.” terminal 33.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors F102, M55

Harness for open or short between PNP switch and “unified meter and A/C amp.”
>> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK PNP SWITCH
Refer to AT- 1 6 6 , "
Component Inspection" .
OK or NG
OK >> GO TO 7.
NG >> Replace PNP switch.
7. CHECK INTERMITTENT INCIDENT
Refer to EC-105, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
8. CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 102 and “unified meter and A/C amp.” terminal 25.
Refer to Wiring Diagram.
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.Continuity should exist.
Continuity should exist.

EC-248
[QR]
DTC P1805 BRAKE SWITCH

Specification data are reference values and are measured between each terminal and ground.
CAUTION:
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.
Diagnostic ProcedureBBS005H9
1. CHECK STOP LAMP SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Check the stop lamp when depressing and releasing the brake pedal.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Disconnect stop lamp switch harness connector.
2. Check voltage between stop lamp switch terminal 3 and ground
with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
101 R/G Stop lamp switch[Ignition switch: OFF]

Brake pedal: Fully releasedApproximately 0V
[Ignition switch: OFF]

Brake pedal: Slightly depressedBATTERY VOLTAGE
(11 - 14V)
Brake pedal Stop lamp
Fully released Not illuminated
Slightly depressed Illuminated
PBIB3288E
Voltage: Battery voltage
PBIB2102E