INFINITI QX56 2011 Factory Service Manual

P1805 BRAKE SWITCHEC-457
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
YES >> INSPECTION END
NO >> Replace stop lamp switch. Refer to
BR-20, "
Removal and Installation".
Revision: 2010 May2011 QX56

EC-458
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P2100, P2103 THROTTLE
CONTROL MOTOR RELAY
P2100, P2103 THROTTLE CONTROL MOTOR RELAY
DTC LogicINFOID:0000000006217960
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.
Which DTC is detected?
P2100 >> GO TO 2.
P2103 >> GO TO 3.
2.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P2100
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-458, "Diagnosis Procedure".
NO >> INSPECTION END
3.PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P2103
1. Turn ignition switch ON and wait at least 1 second.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-458, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217961
1.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 E15.
4. Check the continuity between IPDM E/ R harness connector and ECM harness connector.
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 3.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P2100 ETC MOT PWR-B1
[Throttle contro
l motor relay
circuit open (bank 1)] ECM detects that the voltage of power
source for throttle
control motor is ex-
cessively low.  Harness or connectors
(Throttle control motor relay circuit is open)
 Throttle control motor relay
P2103 ETC MOT PWR
(Throttle contro
l motor relay
circuit short) ECM detects that the throttle control
motor relay is stuck ON.  Harness or connectors
(Throttle control motor re lay circuit is shorted)
 Throttle control motor relay
IPDM E/R ECM Continuity
Connector Terminal Connector Terminal
E15 60 E80 123 Existed
Revision: 2010 May2011 QX56

P2100, P2103 THROTTLE CONTROL MOTOR RELAY
EC-459
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
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
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
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

P2101 ELECTRIC THROTTLE CONTROL FUNCTIONEC-463
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to EM-30, "
Removal and Installation".
2. Perform EC-463, "
Special Repair Requirement".
>> INSPECTION END
Special Repair RequirementINFOID:0000000006217966
1.PERFORM THROTTLE VALVE CL OSED POSITION LEARNING
Refer to EC-147, "
Work Procedure".
>> GO TO 2.
2.PERFORM IDLE AIR VOLUME LEARNING
Refer to EC-148, "
Work Procedure".
>> END
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

P2118 THROTTLE CONTROL MOTOREC-465
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
Refer to
GI-40, "Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace harness or connectors.
4.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
Replace electric throttle control actuator. Refer to EM-30, "
Removal and Installation".
>> INSPECTION END
Component Inspection (Elect ric Throttle Control Motor)INFOID:0000000006217969
1.CHECK THROTTLE CONTROL MOTOR
1. Turn ignition switch OFF.
2. Disconnect electric throttle c ontrol actuator harness connector.
3. Check resistance between electric throttle c ontrol actuator terminals as per the following.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
Replace electric throttle control actuator. Refer to EM-30, "
Removal and Installation".
>> INSPECTION END
Terminals Resistance 5 and 6 Approx. 1 - 15 Ω [at 25 °C (77 °F)]
Revision: 2010 May2011 QX56

EC-466
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P2119 ELECTRIC THROTTLE CONTROL ACTUATOR
P2119 ELECTRIC THROTTLE CONTROL ACTUATOR
DTC LogicINFOID:0000000006217970
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 PROC EDURE FOR MALFUNCTION A AND B
1. Turn ignition switch ON and wait at least 1 second.
2. Selector lever position is D and wait at least 3 seconds.
3. Selector lever position is P.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Turn ignition switch ON and wait at least 1 second.
6. Selector lever position is D and wait at least 3 seconds.
7. Selector lever position is P.
8. Turn ignition switch OFF, wait at least 10 seconds, and then turn ON.
9. Check DTC.
Is DTC detected?
YES >> Go to EC-466, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION C
1. Turn ignition switch ON and wait at least 1 second.
2. Selector lever position is D and wait at least 3 seconds.
3. Selector lever position is N or P.
4. Start engine and let it idle for 3 seconds.
5. Check DTC.
Is DTC detected?
YES >> Go to EC-466, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217971
1.CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1. Turn ignition switch OFF.
2. Remove the intake air duct.
3. Check if foreign matter is caught between the throttle valve and the housing.
Is the inspection result normal?
YES >> GO TO 2.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P2119 ETC ACTR-B1
(Electric throttle control actuator) A)
Electric throttle control actuator does not
function properly due to the return spring
malfunction.
 Electric throttle control actuator
B) Throttle valve opening angle in fail-safe
mode is not in specified range.
C) ECM detects that the throttle valve is stuck
open.
Revision: 2010 May2011 QX56