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![INFINITI FX35 2004 Service Manual EC-428
[VQ35DE]
DTC P1128 THROTTLE CONTROL MOTOR
Revision: 2004 November 2004 FX35/FX45
DTC P1128 THROTTLE CONTROL MOTORPFP:16119
Component DescriptionABS006TR
The throttle control motor is operated b INFINITI FX35 2004 Service Manual EC-428
[VQ35DE]
DTC P1128 THROTTLE CONTROL MOTOR
Revision: 2004 November 2004 FX35/FX45
DTC P1128 THROTTLE CONTROL MOTORPFP:16119
Component DescriptionABS006TR
The throttle control motor is operated b](/manual-img/42/57021/w960_57021-1768.png)
EC-428
[VQ35DE]
DTC P1128 THROTTLE CONTROL MOTOR
Revision: 2004 November 2004 FX35/FX45
DTC P1128 THROTTLE CONTROL MOTORPFP:16119
Component DescriptionABS006TR
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 LogicABS006TS
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 ProcedureABS006TT
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-430, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1128
1128Throttle control motor
circuit shortECM 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-429
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Revision: 2004 November 2004 FX35/FX45
Wiring DiagramABS006TU
TBWM0305E
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![INFINITI FX35 2004 Service Manual EC-430
[VQ35DE]
DTC P1128 THROTTLE CONTROL MOTOR
Revision: 2004 November 2004 FX35/FX45
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measu INFINITI FX35 2004 Service Manual EC-430
[VQ35DE]
DTC P1128 THROTTLE CONTROL MOTOR
Revision: 2004 November 2004 FX35/FX45
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measu](/manual-img/42/57021/w960_57021-1770.png)
EC-430
[VQ35DE]
DTC P1128 THROTTLE CONTROL MOTOR
Revision: 2004 November 2004 FX35/FX45
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 ProcedureABS00CHN
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body. Refer to EC-141, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
4L/WThrottle control motor
(Close)[Ignition switch: ON]
Engine stopped
Shift lever: D
Accelerator pedal: Released0 - 14V
5L/BThrottle control motor
(Open)[Ignition switch: ON]
Engine stopped
Shift lever: D
Accelerator pedal: Fully depressed0 - 14V
PBIB1104E
PBIB1105E
PBIB2195E
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![INFINITI FX35 2004 Service Manual DTC P1128 THROTTLE CONTROL MOTOR
EC-431
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Revision: 2004 November 2004 FX35/FX45
2. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Disconnect INFINITI FX35 2004 Service Manual DTC P1128 THROTTLE CONTROL MOTOR
EC-431
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2. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Disconnect](/manual-img/42/57021/w960_57021-1771.png)
DTC P1128 THROTTLE CONTROL MOTOR
EC-431
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Revision: 2004 November 2004 FX35/FX45
2. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Disconnect electric throttle control actuator harness connector.
2. Disconnect ECM harness connector.
3. Check harness continuity between the following terminals.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace.
3. CHECK THROTTLE CONTROL MOTOR
Refer to EC-431, "
Component Inspection" .
OK or NG
OK >> GO TO 4.
NG >> GO TO 5.
4. CHECK INTERMITTENT INCIDENT
Refer to EC-135, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> GO TO 5.
NG >> Repair or replace harness or connectors.
5. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. Perform EC-49, "
Throttle Valve Closed Position Learning" .
3. Perform EC-49, "
Idle Air Volume Learning" .
>>INSPECTION END
Component InspectionABS006TW
THROTTLE CONTROL MOTOR
1. Disconnect electric throttle control actuator harness connector.
2. Check resistance between terminals 3 and 6.
3. If NG, replace electric throttle control actuator and go to next
step.
4. Perform EC-49, "
Throttle Valve Closed Position Learning" .
5. Perform EC-49, "
Idle Air Volume Learning" .
Electric throttle control
actuator terminalECM terminal Continuity
35 Should not exist
4 Should exist
65 Should exist
4 Should not exist
PBIB1557E
Resistance: Approximately 1 - 15 Ω [at 25 °C (77°F)]
PBIB0095E
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EC-432
[VQ35DE]
DTC P1128 THROTTLE CONTROL MOTOR
Revision: 2004 November 2004 FX35/FX45
Removal and InstallationABS006TX
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-19, "INTAKE MANIFOLD COLLECTOR" .
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EC-433
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Revision: 2004 November 2004 FX35/FX45
DTC P1143, P1163 HO2S1PFP:22690
Component DescriptionABS006TY
The heated oxygen sensor 1 is plac INFINITI FX35 2004 Service Manual DTC P1143, P1163 HO2S1
EC-433
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DTC P1143, P1163 HO2S1PFP:22690
Component DescriptionABS006TY
The heated oxygen sensor 1 is plac](/manual-img/42/57021/w960_57021-1773.png)
DTC P1143, P1163 HO2S1
EC-433
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Revision: 2004 November 2004 FX35/FX45
DTC P1143, P1163 HO2S1PFP:22690
Component DescriptionABS006TY
The heated oxygen sensor 1 is placed into the exhaust manifold. It
detects the amount of oxygen in the exhaust gas compared to the
outside air. The heated oxygen sensor 1 has a closed-end tube
made of ceramic zirconia. The zirconia generates voltage from
approximately 1V in richer conditions to 0V in leaner conditions. The
heated oxygen sensor 1 signal is sent to the ECM. The ECM adjusts
the injection pulse duration to achieve the ideal air-fuel ratio. The
ideal air-fuel ratio occurs near the radical change from 1 to 0V.
CONSULT-II Reference Value in Data Monitor ModeABS006TZ
Specification data are reference values.
On Board Diagnosis LogicABS006U0
To judge the malfunction, the output from the heated oxygen sensor
1 is monitored to determine whether the rich output is sufficiently
high and whether the lean output is sufficiently low. When both the
outputs are shifting to the lean side, the malfunction will be detected.
SEF463R
SEF288D
MONITOR ITEM CONDITION SPECIFICATION
HO2S1 (B1)
HO2S1 (B2)
Engine: After warming up Maintaining engine speed at 2,000 rpm0 - 0.3V ←→ Approx. 0.6 -
1.0V
HO2S1 MNTR (B1)
HO2S1 MNTR (B2)LEAN ←→ RICH
Changes more than 5 times
during 10 seconds.
SEF300U
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1143
11 4 3
(Bank 1)
Heated oxygen sensor
1 lean shift monitoringThe maximum and minimum voltage from the
sensor are not reached to the specified volt-
ages.
Heated oxygen sensor 1
Heated oxygen sensor 1 heater
Fuel pressure
Injector
Intake air leaks P1163
11 6 3
(Bank 2)
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![INFINITI FX35 2004 Service Manual EC-434
[VQ35DE]
DTC P1143, P1163 HO2S1
Revision: 2004 November 2004 FX35/FX45
DTC Confirmation ProcedureABS006U1
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has INFINITI FX35 2004 Service Manual EC-434
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DTC P1143, P1163 HO2S1
Revision: 2004 November 2004 FX35/FX45
DTC Confirmation ProcedureABS006U1
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has](/manual-img/42/57021/w960_57021-1774.png)
EC-434
[VQ35DE]
DTC P1143, P1163 HO2S1
Revision: 2004 November 2004 FX35/FX45
DTC Confirmation ProcedureABS006U1
CAUTION:
Always drive vehicle at a safe speed.
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:
Always perform at a temperature above −10°C (14°F).
Before performing following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine and wait at least 10 seconds.
3. Turn ignition switch ON and select “HO2S1 (B1) P1143” of “HO2S1” or “HO2S1 (B2) P1163” of “HO2S1”
in “DTC WORK SUPPORT” mode with CONSULT-II.
4. Touch “START”.
5. Start engine and let it idle for at least 3 minutes.
NOTE:
Never raise engine speed above 3,600 rpm after this step. If
the engine speed limit is exceeded, return to step 5.
6. When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions con-
tinuously until “TESTING” changes to “COMPLETED”. (It will
take approximately 40 seconds or more.)
If “TESTING” is not displayed after 5 minutes, retry from
step 2.
7. Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”. If “NG” is displayed, refer to EC-435, "
Diagnostic
Procedure" .
PBIB0546E
ENG SPEED 1,000 - 3,100 rpm
Vehicle speed Less than 100 km/h (62 MPH)
B/FUEL SCHDL 2.0 - 17.0 msec
Selector lever Suitable position
PBIB0547E
SEC769C
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Overall Function CheckABS006U2
Use this procedure to check the overall function of the heated ox INFINITI FX35 2004 Service Manual DTC P1143, P1163 HO2S1
EC-435
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Overall Function CheckABS006U2
Use this procedure to check the overall function of the heated ox](/manual-img/42/57021/w960_57021-1775.png)
DTC P1143, P1163 HO2S1
EC-435
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Overall Function CheckABS006U2
Use this procedure to check the overall function of the heated oxygen sensor 1 circuit. During this check, a
DTC might not be confirmed.
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 35 [HO2S1(B1) signal] or 16 [HO2S1(B2) signal] and
ground.
3. Check one of the following with engine speed held at 2,000 rpm
constant under no load.
–The maximum voltage is over 0.6V at least 1 time.
–The minimum voltage is over 0.1V at least 1 time.
4. If NG, go to EC-435, "
Diagnostic Procedure" .
Diagnostic ProcedureABS006U3
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body. Refer to EC-141, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2. RETIGHTEN HEATED OXYGEN SENSOR 1
Loosen and retighten corresponding heated oxygen sensor 1.
>> GO TO 3.
PBIB1107E
PBIB2195E
Tightening torque: 45 N·m (4.6 kg-m, 33 ft-lb)
PBIB1577E