Infiniti F50. Manual - part 471

DTC P1229 SENSOR POWER SUPPLY

EC-525

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DTC P1229 SENSOR POWER SUPPLY

PFP:16119

On Board Diagnosis Logic

EBS00MKE

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

EBS00MKF

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-527, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P1229
1229

Sensor power supply 
circuit short

ECM detects a voltage of power source for 
sensor is excessively low or high.

●

Harness or connectors
(The TP sensor 1 and 2 circuit is shorted.)
(APP sensor 1 circuit is shorted.)
(MAF sensor circuit is shorted.)
(EVAP control system pressure sensor circuit 
is shorted.)
(Power steering pressure sensor circuit is 
shorted.)
(Refrigerant pressure sensor circuit is 
shorted.)

●

Electric throttle control actuator
(TP sensor 1 and 2)

●

Accelerator pedal position sensor
(APP sensor 1)

●

MAF sensor

●

EVAP control system pressure sensor

●

Power steering pressures sensor

●

Refrigerant pressures sensor

●

ECM pin terminal

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-526

DTC P1229 SENSOR POWER SUPPLY

Wiring Diagram

EBS00MKG

TBWM0130E

DTC P1229 SENSOR POWER SUPPLY

EC-527

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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.

Diagnostic Procedure

EBS00MKH

1. 

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch “OFF”.

2.

Loosen and retighten engine ground screws.

>> GO TO 2.

2. 

CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect electric throttle control actuator harness connector.

2.

Turn ignition switch “ON”.

3.

Check voltage between electric throttle control actuator terminal
1 and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

103

L

Sensor power supply

[Ignition switch “ON”]

Approximately 5V

PBIB0011E

PBIB0015E

Voltage: Approximately 5V

PBIB0082E

EC-528

DTC P1229 SENSOR POWER SUPPLY

3. 

CHECK SENSOR POWER SUPPLY CIRCUITS

Check the following.

●

Harness for short to power and short to ground, between the following terminals.

●

ECM pin terminal.

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.

●

Accelerator pedal position sensor (Refer to 

EC-612, "Component Inspection"

 .)

●

Mass air flow sensor (Refer to 

EC-184, "Component Inspection"

 .)

●

EVAP control system pressure sensor (Refer to 

EC-357, "Component Inspection"

 .)

●

Power steering pressure sensor (Refer to 

EC-406, "Component Inspection"

 .)

OK or NG

OK

>> GO TO 7.

NG

>> Replace malfunctioning component.

5. 

CHECK THROTTLE POSITION SENSOR

Refer to 

EC-296, "Component Inspection"

 .

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace electric throttle control actuator.

2.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

 .

3.

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

4.

Perform 

EC-46, "Idle Air Volume Learning"

 .

>> INSPECTION END

7. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

ECM terminal

Sensor terminals

Reference Wiring Diagram

103

Electric throttle control actuator terminal 1

EC-526

APP sensor terminal 7

EC-609

MAF sensor terminal 2

EC-181

EVAP control system pressure sensor terminal 1

EC-354

Power steering pressure sensor terminal 1

EC-402

Refrigerant pressure sensor terminal 1

EC-673