Infiniti I35 (A33). Manual — part 283
PBIB0098E
Component Inspection
NHEC1312
THROTTLE CONTROL MOTOR RELAY
1.
Apply 12V direct current between relay terminals 1 and 2.
2.
Check continuity between relay terminals 3 and 5.
Conditions
Continuity
12V direct current supply between ter-
minals 1 and 2
Yes
No current supply
No
3.
If NG, replace throttle control motor relay.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
Component Inspection
EC-473
Component Description
NHEC1313
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
NHEC1452
This self-diagnosis has the one trip detection logic.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition
Possible Cause
P1128
1128
Throttle control motor
circuit short
ECM detects short both circuits between ECM and
throttle control motor.
I
Harness or connectors
(Throttle control motor circuit is
shorted.)
I
Electric throttle control actuator
(Throttle control motor)
FAIL-SAFE MODE
NHEC1452S01
When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.
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.
DTC Confirmation Procedure
NHEC1453
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.
SEF058Y
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 “Diagnostic Procedure”, EC-476.
With GST
Follow the procedure “With CONSULT-II” above.
DTC P1128 THROTTLE CONTROL MOTOR
Component Description
EC-474
Wiring Diagram
NHEC1316
MEC361E
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1128 THROTTLE CONTROL MOTOR
Wiring Diagram
EC-475
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
COLOR
ITEM
CONDITION
DATA (DC Voltage)
101
Y
Throttle control motor
(Open)
[Ignition switch ON]
I
Engine stopped
I
Shift lever position is D
I
Accelerator pedal fully depressed
0 - 14V
★
SEC037D
103
BR
Throttle control motor
(Close)
[Ignition switch ON]
I
Engine stopped
I
Shift lever position is D
I
Accelerator pedal released
0 - 14V
★
SEC038D
★
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
NHEC1317
1
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two engine ground screws.
Refer to “Ground Inspection”, EC-160.
SEC047D
OK or NG
OK
©
GO TO 2.
NG
©
Repair or replace ground connections.
DTC P1128 THROTTLE CONTROL MOTOR
Wiring Diagram (Cont’d)
EC-476
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