Infiniti QX56 (Z62). Manual - part 559

EC-214

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0112, P0113 IAT SENSOR

YES

>> GO TO 3.

NO

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

3.

CHECK INTAKE AIR TEMPERATURE SENSOR

Refer to 

EC-214, "Component Inspection (Intake Air Temperature Sensor)"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace mass air flow sensor (with intake air temperature sensor).

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (Intake Air Temperature Sensor)

INFOID:0000000006217797

1.

CHECK INTAKE AIR TEMPERATURE SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect mass air flow sensor harness connector.

3.

Check resistance between mass air flow sensor terminals as per the following.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace mass air flow sensor (with intake air temperature sensor). Refer to 

EM-27, "Removal and

Installation"

.

Terminals

Condition

Resistance (k

Ω

)

1 and 2

Temperature [

°

C (

°

F)]

25 (77)

1.94 - 2.06

P0116 ECT SENSOR

EC-215

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0116 ECT SENSOR

DTC Logic

INFOID:0000000006288277

DTC DETECTION LOGIC

NOTE:
If DTC P0116 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117,
P0118. Refer to 

EC-217, "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.

TEST CONDITION:
Before performing the following procedure, do not add fuel.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and warm it up to normal operating temperature.

2.

Rev engine up to 2,000 rpm for more than 10 minutes.

3.

Move the vehicle to a cool place, then stop engine.

4.

Check resistance between “fuel level sensor unit and fuel pump” terminals 4 and 5.

5.

Soak the vehicle until the resistance between “fuel level sensor unit and fuel pump” terminals 4 and 5
becomes 0.5 k

Ω

 higher than the value measured before soaking.

CAUTION:

Never turn ignition switch ON during soaking.
NOTE:
Soak time changes depending on ambient air temperature. It may take several hours.

6.

Start engine and let it idle for 20 minutes.

7.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-215, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006288278

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-216, "Component Inspection (Engine Coolant Temperature Sensor)"

.

Is the inspection result normal?

OK

>> GO TO 2.

NG

>> Replace engine coolant temperature sensor. Refer to 

EM-86, "Exploded View"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0116

ECT SEN/CIRC
(Engine coolant tempera-
ture sensor circuit range/
performance)

Engine coolant temperature signal from engine 
coolant temperature sensor does not fluctuate, 
even when some time has passed after starting 
the engine with pre-warming up condition.

• Harness or connectors

(High or low resistance in the circuit)

• Engine coolant temperature sensor

EC-216

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0116 ECT SENSOR

Component Inspection (Engine Coolant Temperature Sensor)

INFOID:0000000006288609

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

P0117, P0118 ECT SENSOR

EC-217

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0117, P0118 ECT SENSOR

DTC Logic

INFOID:0000000006217798

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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 5 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-217, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006217799

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect engine coolant temperature (ECT) sensor harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between ECT sensor 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 ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between ECT sensor harness connector and ECM harness connector.

4.

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

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0117

ECT SEN/CIRC
(Engine coolant tempera-
ture sensor circuit low input)

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

• Harness or connectors

(The engine coolant temperature sensor 
circuit is open or shorted.)

• Engine coolant temperature sensor 

P0118

ECT SEN/CIRC
(Engine coolant tempera-
ture sensor circuit high in-
put)

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

ECT sensor

Ground

Voltage (V)

Connector

Terminal

F21

1

Ground

Approx. 5

ECT sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

F21

2

F111

40

Existed