2004 INFINITI QX56 Factory Service Manual

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Page 1561 of 3371

INFINITI QX56 2004 Factory Service Manual EC-370Revision: August 2007
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
2004 QX56
2. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I
1. Check voltage between ECM terminal 3 and ground under

Page 1562 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
EC-371
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6. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-II
1. Disconnect ECM harness con

Page 1563 of 3371

INFINITI QX56 2004 Factory Service Manual EC-372Revision: August 2007
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
2004 QX56
10. CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Remove the intake air duct.
2. Check if foreign matter is c

Page 1564 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
EC-373
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Revision: August 20072004 QX56
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAYPFP:16119
Component DescriptionUBS00H7P
Power

DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
EC-373
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Revision: August 20072004 QX56
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAYPFP:16119
Component DescriptionUBS00H7P
Power supply for the throttle control motor is provided to the ECM via throttle control motor relay. The throttle
control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends
an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition
switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not
provided to the ECM.
CONSULT-II Reference Value in Data Monitor ModeUBS00H7Q
Specification data are reference values.
On Board Diagnosis LogicUBS00H7R
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MlL lights up.
DTC Confirmation ProcedureUBS00H7S
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.
PROCEDURE FOR DTC P1124
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8V when engine
is running.
With CONSULT-II
1. Turn ignition switch ON and wait at least 1 second.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. If DTC is detected, go to EC-376, "
Diagnostic Procedure" .
With GST
Follow the procedure “With CONSULT-II” above.
MONITOR ITEM CONDITION SPECIFICATION
THRTL RELAY
Ignition switch: ON ON
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1124
11 2 4Throttle control motor
relay circuit shortECM detect the throttle control motor
relay is stuck ON.
Harness or connectors
(Throttle control motor relay circuit is shorted)
Throttle control motor relay
P1126
11 2 6Throttle control motor
relay circuit openECM detects a voltage of power source
for throttle control motor is excessively
low.
Harness or connectors
(Throttle control motor relay circuit is open)
Throttle control motor relay
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.
SEF 0 58 Y

Page 1565 of 3371

INFINITI QX56 2004 Factory Service Manual EC-374Revision: August 2007
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
2004 QX56
PROCEDURE FOR DTC P1126
With CONSULT-II
1. Turn ignition switch ON and wait at least 2 seconds.
2. Select “DATA M

Page 1566 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
EC-375
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Revision: August 20072004 QX56
Wiring DiagramUBS00H7T
BBWA11 79 E

Page 1567 of 3371

INFINITI QX56 2004 Factory Service Manual EC-376Revision: August 2007
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
2004 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM g

Page 1568 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
EC-377
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Revision: August 20072004 QX56
4. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I
1. Check voltage between ECM

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