Infiniti QX56 (Z62). Manual - part 560

EC-218

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0117, P0118 ECT SENSOR

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair open circuit, short to ground or short to power in harness or connectors.

3.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-218, "Component Inspection (Engine Coolant Temperature Sensor)"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace engine coolant temperature sensor.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (Engine Coolant Temperature Sensor)

INFOID:0000000006217800

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect engine coolant temperature sensor harness connector.

3.

Remove engine coolant temperature sensor.

4.

Check resistance between engine coolant temperature sensor
terminals by heating with hot water as shown in the figure.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace engine coolant temperature sensor. Refer to

EM-86, "Exploded View"

.

Terminals

Condition

Resistance (k

Ω

)

1 and 2

Temperature [

°

C (

°

F)]

20 (68)

2.35 - 2.73

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

JMBIA0080ZZ

P0122, P0123 TP SENSOR

EC-219

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0122, P0123 TP SENSOR

DTC Logic

INFOID:0000000006217801

DTC DETECTION LOGIC

NOTE:
If DTC P0122 or P0123 is displayed with DTC P0643, perform the trouble diagnosis for DTC P0643.
Refer to 

EC-381, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

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:
Before performing the following procedure, confirm 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-219, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006217802

1.

CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT

1.

Disconnect electric throttle control actuator harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between electric throttle control actuator harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair open circuit, short to ground or short to power in harness or connectors.

2.

CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0122

TP SEN 2/CIRC-B1
(Throttle position sensor 2 
circuit low input)

An excessively low voltage from the TP 
sensor 2 is sent to ECM.

• Harness or connectors

(TP sensor 2 circuit is open or shorted.)

• Electric throttle control actuator

(TP sensor 2)

P0123

TP SEN 2/CIRC-B1
(Throttle position sensor 2 
circuit high input)

An excessively high voltage from the TP 
sensor 2 is sent to ECM.

Electric throttle control actuator

Ground

Voltage

Connector

Terminal

F66

2

Ground

Approx. 5 V

EC-220

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0122, P0123 TP SENSOR

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair open circuit, short to ground or short to power in harness or connectors.

3.

CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.

2.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair open circuit, short to ground or short to power in harness or connectors.

4.

CHECK THROTTLE POSITION SENSOR

Refer to 

EC-220, "Component Inspection (Throttle Position Sensor)"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

Replace electric throttle control actuator. Refer to 

EM-30, "Removal and Installation"

.

>> INSPECTION END

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (Throttle Position Sensor)

INFOID:0000000006217803

1.

CHECK THROTTLE POSITION SENSOR

1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

3.

Perform 

EC-147, "Work Procedure"

.

4.

Turn ignition switch ON.

5.

Set selector lever position to D.

6.

Check the voltage between ECM harness connector terminals under the following conditions.

Electric throttle control actuator

ECM

Continuity

Connector

Terminal

Connector

Terminal

F66

4

F110

97

Existed

Electric throttle control actuator

ECM

Continuity

Connector

Terminal

Connector

Terminal

F66

3

F110

79

Existed

P0122, P0123 TP SENSOR

EC-221

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

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EC

N

P

O

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

ECM

Condition

Voltage (V)

Connector

+

–

Terminal

Terminal

F110

91

(TP sensor 1 signal)

97

(Sensor ground)

Accelerator pedal

Fully released

More than 0.36

Fully depressed

Less than 4.75

79

(TP sensor 2 signal)

Fully released

Less than 4.75

Fully depressed

More than 0.36