ground INFINITI QX56 2011 Factory Service Manual

P2100, P2103 THROTTLE CONTROL MOTOR RELAY
EC-459
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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NO >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
 Harness for open or short between ECM and IPDM E/R
 Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK THROTTLE CONTROL MOTO R RELAY INPUT SIGNAL CIRCUIT
1. Check the continuity between IPDM E/R s ensor harness connector and ECM harness connector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
 Harness for open or short between ECM and IPDM E/R
 Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK FUSE
1. Disconnect 20 A fuse (No. 64) from IPDM E/R.
2. Check if 20 A fuse is blown.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace 20 A fuse.
6.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to PCS-32, "Removal and Installation".
NO >> Repair or replace harness or connectors.
IPDM E/R ECM Continuity
Connector Terminal Connector Terminal
E15 55 E80 173 Existed
Revision: 2010 May2011 QX56

EC-460
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P2101 ELECTRIC THROTTLE CONTROL FUNCTION
P2101 ELECTRIC THROTTL
E CONTROL FUNCTION
DescriptionINFOID:0000000006217962
Electric throttle control actuator consists of th rottle control motor, throttle position sensor, etc.
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. ECM controls the throttle valve openi ng angle in response to driving condition via the throttle
control motor.
DTC LogicINFOID:0000000006217963
DTC DETECTION LOGIC
NOTE:
 If DTC P2101 is displayed with DTC P2100, first pe rform the trouble diagnosis for DTC P2100. Refer
to EC-458, "
DTC Logic".
 If DTC P2101 is displayed with DTC P2119, first pe rform the trouble diagnosis for DTC P2119. Refer
to EC-466, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 2 seconds.
2. Start engine and let it idle for 5 seconds.
3. Check DTC.
Is DTC detected?
YES >> Go to EC-460, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217964
1.CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I
1. Check the voltage between ECM harness connector and ground under the following conditions.
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 2.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P2101 Electric throttle control
performance Electric throttle control function does not
operate properly.  Harness or connectors
(Throttle control motor circuit is open or shorted)
 Electric throttle control actuator
ECM Ground Condition Voltage
Connector Terminal
E80 173 Ground Ignition switch:
OFF
Approx. 0 V
Ignition switch:
ON Battery voltage
Revision: 2010 May2011 QX56

P2101 ELECTRIC THROTTLE CONTROL FUNCTIONEC-461
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2.CHECK THROTTLE CONTROL MOTO
R RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between ECM harne ss connector and IPDM E/R harness connector.
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
 Harness for open or short between ECM and IPDM E/R
 Loose or poor connection for each connector and harness
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II
1. Check the continuity between ECM harne ss connector and IPDM E/R harness connector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
 Harness for open or short between ECM and IPDM E/R
 Loose or poor connection for each connector and harness
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK FUSE
1. Disconnect 20 A fuse (No. 64) from IPDM E/R.
2. Check 20 A fuse for blown.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Replace 20 A fuse.
7.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> Replace IPDM E/R. Refer to PCS-32, "Removal and Installation".
NO >> Repair or replace harness or connectors.
8.CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Turn ignition switch OFF.
IPDM E/R ECM Continuity
Connector Terminal Connector Terminal
E15 60 E80 123 Existed
IPDM E/R ECM Continuity
Connector Terminal Connector Terminal
E15 55 E80 173 Existed
Revision: 2010 May2011 QX56

EC-462
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P2101 ELECTRIC THROTTLE CONTROL FUNCTION
2. Disconnect electric throttle control actuator harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between electric throttle
control actuator harness connector and ECM harness con-
nector.
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Repair or replace.
9.CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Remove the intake air duct.
2. Check if foreign matter is caught between the throttle valve and the housing.
Is the inspection result normal?
YES >> GO TO 10.
NO >> Remove the foreign matter and clean the electric throttle control actuator inside, then perform
throttle valve closed position learning. Refer to EC-147, "
Work Procedure".
10.CHECK THROTTLE CONTROL MOTOR
Refer to EC-462, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 11.
NO >> GO TO 12.
11 .CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 12.
NO >> Repair or replace harness or connectors.
12.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace malfunction electric throttle control actuator. Refer to EM-30, "
Removal and Installation".
2. Perform EC-463, "
Special Repair Requirement".
>> INSPECTION END
Component InspectionINFOID:0000000006217965
1.CHECK THROTTLE CONTROL MOTOR
1. Turn ignition switch OFF.
2. Disconnect electric throttle control actuator harness connector.
3. Check the resistance between electric throttle c ontrol actuator terminals as per the following.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
Electric throttle control actuator ECM Continuity
Connector Terminal Connector Terminal
F66 5
F110 57 Not existed
63 Existed
6 57 Existed
63 Not existed
Terminals Resistance
5 and 6 Approx. 1 - 15 Ω [at 25 °C (77 °F)]
Revision: 2010 May2011 QX56

EC-464
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P2118 THROTTLE CONTROL MOTOR
P2118 THROTTLE CONTROL MOTOR
DTC LogicINFOID:0000000006217967
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 2 seconds.
2. Start engine and let it idle for 5 seconds.
3. Check DTC.
Is DTC detected?
YES >> Go to EC-464, "DTC Logic".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217968
1.CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect electric throttle control actuator harness connector.
2. Disconnect ECM harness connector.
3. Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning part.
2.CHECK THROTTLE CONTROL MOTOR
Refer to EC-465, "
Component Inspection (Electric Throttle Control Motor)".
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 4.
3.CHECK INTERMITTENT INCIDENT
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P2118 ETC MOT-B1
(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)
Electric throttle control actuator ECM Continuity
Connector Terminal Connector Terminal
F66 5
F110 57 Not existed
63 Existed
6 57 Existed
63 Not existed
Revision: 2010 May2011 QX56

EC-468
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P2122, P2123 APP SENSOR
P2122, P2123 APP SENSOR
DTC LogicINFOID:0000000006217972
DTC DETECTION LOGIC
NOTE:
If DTC P2122 or P2123 is displayed with DTC P
0643, perform the trouble diagnosis for DTC P0643.
Refer to EC-381, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confi rm that battery voltage is 8 V or more at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-468, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217973
1.CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between APP sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
 Harness for open or short between ECM and APP sensor
 Loose or poor connection for each connector and harness
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P2122 APP SEN 1/CIRC
(Accelerator pedal position
sensor 1 circuit low input) An excessively low voltage from the APP
sensor 1 is sent to ECM.
 Harness or connectors
(APP sensor 1 circuit is open or shorted.)
 Accelerator pedal position sensor (APP sensor 1)
P2123 APP SEN 1/CIRC
(Accelerator pedal position
sensor 1 circuit high input) An excessively high voltage from the APP
sensor 1 is sent to ECM.
APP sensor
Ground Voltage (V)
Connector Terminal
E110
(Without ICC) 2
Ground Approx. 5
E67
(With ICC) 12
Revision: 2010 May2011 QX56

P2122, P2123 APP SENSOREC-469
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>> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between APP sens or harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
 Harness for open or short between ECM and APP sensor
 Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between APP sens or harness connector and ECM harness connector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
 Loose or poor connection for each connector and harness
 Harness for open or short between ECM and APP sensor
>> Repair open circuit, short to ground or short to power in harness or connectors.
7.CHECK APP SENSOR
Refer to EC-470, "
Component Inspection (Accelerator Pedal Position Sensor)".
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 8.
8.REPLACE ACCELERATOR PEDAL ASSEMBLY
APP sensor ECM Continuity
Connector Terminal Connector Terminal
E110
(Without ICC) 4
E80 140 Existed
E67
(With ICC) 11
APP sensor ECM
Continuity
Connector Terminal Connector Terminal
E110
(Without ICC) 3
E80 136 Existed
E67
(With ICC) 10
Revision: 2010 May2011 QX56

P2127, P2128 APP SENSOREC-471
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P2127, P2128 APP SENSOR
DTC LogicINFOID:0000000006217975
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confi rm that battery voltage is 8 V or more at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-471, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217976
1.CHECK ACCELERATOR PEDAL POSITION SENSOR 2 POWER SUPPLY CIRCUIT-I
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between APP sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 2.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P2127 APP SEN 2/CIRC
(Accelerator pedal position
sensor 2 circuit low input) An excessively low voltage from
the APP sensor 2 is sent to ECM.  Harness or connectors
(Accelerator pedal position sensor 2 circuit is open or
shorted.)
(Battery current sensor circuit is shorted.)
[Camshaft position sensor (bank 1) circuit is shorted.]
(Crankshaft position sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is shorted.)
(EVAP control system pres sure sensor circuit is
shorted.)
 Accelerator pedal position sensor (APP sensor 2)
 Battery current sensor
 Camshaft position sensor (bank 1)
 Crankshaft position sensor
 Refrigerant pressure sensor
 EVAP control system pressure sensor
P2128
APP SEN 2/CIRC
(Accelerator pedal position
sensor 2 circuit high input) An excessively high voltage from
the APP sensor 2 is sent to ECM.
APP sensor
Ground Voltage (V)
Connector Terminal
E110
(Without ICC) 1
Ground Approx. 5
E67
(With ICC) 9
Revision: 2010 May2011 QX56

EC-472
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P2127, P2128 APP SENSOR
2.CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between APP sens or harness connector and ECM harness connector.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
 Loose or poor connection for each connector and harness
 Harness for open or short between ECM and APP sensor
>> Repair open circuit.
4.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair short to ground or short to power in harness or connectors.
5.CHECK COMPONENTS
Check the following.
 Crankshaft position sensor (Refer to EC-301, "
Component Inspection (Crankshaft Position Sensor)".)
 Camshaft position sensor (bank 1) (Refer to EC-306, "
Component Inspection (Camshaft Position Sensor)".)
 Refrigerant pressure sensor (Refer to EC-520, "
Component Function Check".)
 EVAP control system pressure sensor (Refer to EC-335, "
Component Inspection (EVAP Control System
Pressure Sensor)".)
Is the inspection result normal?
YES >> GO TO 12.
NO >> Replace malfunctioning component.
6.CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between APP sens or harness connector and ECM harness connector.
APP sensor ECM
Continuity
Connector Terminal Connector Terminal
E110
(Without ICC) 1
E80 131 Existed
E67
(With ICC) 9
ECM Sensor
Connector Terminal Name Connector Terminal
F110 76 Crankshaft position sensor F74 1
77 Camshaft position sensor (bank 1) F84 1
E80 133Battery current sensor E63 2
Refrigerant pressure sensor E77 1
EVAP control system pressure sensor C17 3
131 APP sensor (Without ICC) E110 1
APP sensor (with ICC) E67 9
Revision: 2010 May2011 QX56

P2127, P2128 APP SENSOREC-473
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4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
 Loose or poor connection for each connector and harness
 Harness for open or short between ECM and APP sensor
>> Repair open circuit, short to ground or short to power in harness or connectors.
8.CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between APP sens or harness connector and ECM harness connector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 9.
9.DETECT MALFUNCTIONING PART
Check the following.
 Harness for open or short between ECM and APP sensor
 Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
10.CHECK APP SENSOR
Refer to EC-474, "
Component Inspection (Accelerator Pedal Position Sensor)".
Is the inspection result normal?
YES >> GO TO 12.
NO >> GO TO 11.
11 .REPLACE ACCELERATOR PEDAL ASSEMBLY
Replace accelerator pedal assembly. Refer to ACC-3, "
MODELS WITHOUT DISTANCE CONTROL ASSIST
SYSTEM : Removal and Installation" (Without distance control assist system) or ACC-4, "MODELS WITH
DISTANCE CONTROL ASSIST SYSTEM : Removal and Installation" (With distance control assist system).
>> INSPECTION END
12.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
APP sensor ECM
Continuity
Connector Terminal Connector Terminal
E110
(Without ICC) 5
E80 129 Existed
E67
(With ICC) 8
APP sensor ECM
Continuity
Connector Terminal Connector Terminal
E110
(Without ICC) 6
E80 126 Existed
E67
(With ICC) 7
Revision: 2010 May2011 QX56