Infiniti F50. Manual — part 471
DTC P1229 SENSOR POWER SUPPLY
EC-525
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EC
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.
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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EC
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
APP sensor terminal 7
MAF sensor terminal 2
EVAP control system pressure sensor terminal 1
Power steering pressure sensor terminal 1
Refrigerant pressure sensor terminal 1
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