Infiniti F50. Manual — part 452
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DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
EC-449
C
D
E
F
G
H
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A
EC
2.
Check continuity between relay terminals 3 and 5.
3.
If NG, replace throttle control motor relay.
Conditions
Continuity
12V direct current supply between terminals
1 and 2
Yes
No current supply
No
PBIB0098E
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EC-450
DTC P1128 THROTTLE CONTROL MOTOR
DTC P1128 THROTTLE CONTROL MOTOR
PFP:16119
Component Description
EBS00MI1
The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feed-
back to the ECM to control the throttle control motor to make the throttle valve opening angle properly in
response to driving condition.
On Board Diagnosis Logic
EBS00MI2
This self-diagnosis has the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation Procedure
EBS00MI3
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.
WITH CONSULT-II
1.
Turn ignition switch “ON” and wait at least 2 seconds.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and let it idle for 5 seconds.
4.
If DTC is detected, go to
EC-452, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1128
1128
Throttle control motor
circuit short
ECM detects short in both circuits between
ECM and throttle control motor.
●
Harness or connectors
(Throttle control motor circuit is shorted.)
●
Electric throttle control actuator
(Throttle control motor)
Engine operating 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
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DTC P1128 THROTTLE CONTROL MOTOR
EC-451
C
D
E
F
G
H
I
J
K
L
M
A
EC
Wiring Diagram
EBS00MI4
TBWM0123E
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EC-452
DTC P1128 THROTTLE CONTROL MOTOR
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
EBS00MI5
1.
RETIGHTEN GROUND SCREWS
1.
Turn ignition switch “OFF”.
2.
Loosen and retighten engine ground screws.
>> GO TO 2.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
151
L/B
Throttle control motor
(Open)
[Ignition switch “ON”]
●
Engine stopped
●
Selector lever: “D”
●
Accelerator pedal is fully depressed
0 - 14V
154
L/W
Throttle control motor
(Close)
[Ignition switch “ON”]
●
Engine stopped
●
Selector lever: “D”
●
Accelerator pedal is released
0 - 14V
PBIB0058E
PBIB0061E
PBIB0011E
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