2004 INFINITI QX56 Factory Service Manual

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Page 1569 of 3371

INFINITI QX56 2004 Factory Service Manual EC-378Revision: August 2007
DTC P1128 THROTTLE CONTROL MOTOR
2004 QX56
DTC P1128 THROTTLE CONTROL MOTORPFP:16119
Component DescriptionUBS00H7V
The throttle control motor is operated by the ECM and it

Page 1570 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1128 THROTTLE CONTROL MOTOR
EC-379
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Revision: August 20072004 QX56
Wiring DiagramUBS00H7Y
BBWA11 80 E

Page 1571 of 3371

INFINITI QX56 2004 Factory Service Manual EC-380Revision: August 2007
DTC P1128 THROTTLE CONTROL MOTOR
2004 QX56
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II

Page 1572 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1128 THROTTLE CONTROL MOTOR
EC-381
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2. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Disconnect electric throttle

Page 1573 of 3371

INFINITI QX56 2004 Factory Service Manual EC-382Revision: August 2007
DTC P1128 THROTTLE CONTROL MOTOR
2004 QX56
Removal and InstallationUBS00H81
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-15, "INTAKE MANIFOLD" .

Page 1574 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1146, P1166 HO2S2
EC-383
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DTC P1146, P1166 HO2S2PFP:226A0
Component DescriptionUBS00H82
The heated oxygen sensor 2, after three way catalys

Page 1575 of 3371

INFINITI QX56 2004 Factory Service Manual EC-384Revision: August 2007
DTC P1146, P1166 HO2S2
2004 QX56
DTC Confirmation ProcedureUBS00H85
NOTE:
If DTC confirmation Procedure has been previously conducted, always turn ignition switch OFF and w

EC-384Revision: August 2007
DTC P1146, P1166 HO2S2
2004 QX56
DTC Confirmation ProcedureUBS00H85
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
TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30 °C (32 to 86 °F).
1. Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2. Start engine and warm it up to the normal operating tempera-
ture.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and
4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Make sure that “COOLAN TEMP/S” indicates more than 70°C
(158°F).
If not, warm up engine and go to next step when “COOLAN
TEMP/S” indication reaches to 70°C (158°F).
7. Open engine hood.
8. Select “HO2S2 (B1) P1146” or “HO2S2 (B2) P1166” of “HO2S2” in “DTC WORK SUPPORT” mode with
CONSULT-II.
9. Start engine and following the instruction of CONSULT-II.
10. Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”.
If “NG” is displayed, refer to EC-389, "
Diagnostic Procedure" .
If “CAN NOT BE DIAGNOSED” is displayed, perform the following.
a. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
b. Return to step 1.
Overall Function CheckUBS00H86
Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st
trip DTC might not be confirmed.
WITH GST
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Set voltmeter probes between ECM terminal 55 [HO2S2 (B1) signal] or 74 [HO2S2 (B2) signal] and
ground.
SEF 1 74 Y
PBIB0818E

Page 1576 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1146, P1166 HO2S2
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6. Check the voltage when revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelerat

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