Infiniti QX56 (JA60). Manual - part 371

EC-136

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P0128 THERMOSTAT FUNCTION

2.

CHECK THERMOSTAT

Refer to 

CO-22, "Removal and Installation"

.

OK or NG

OK

>> INSPECTION END

NG

>> Replace thermostat.

Component Inspection

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ENGINE COOLANT TEMPERATURE SENSOR

1. Check resistance between engine coolant temperature sensor

terminals 1 and 2 as shown in the figure.

2. If NG, replace engine coolant temperature sensor.

PBIB2005E

Engine coolant temperature

°C (°F)]

Resistance (k

Ω)

20 (68)

2.1 - 2.9

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

SEF012P

P0130, P0150 A/F SENSOR 1

EC-137

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P0130, P0150 A/F SENSOR 1

Component Description

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The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-

sor. The sensor element of the A/F sensor 1 is composed an elec-

trode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement   = 1, but also in the

lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide   range.

The exhaust gas components diffuse through the diffusion layer at

the sensor cell. An electrode layer is applied voltage, and this current

relative oxygen density in lean. Also this current relative hydrocar-

bon density in rich.

Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this

electrode layer of current. In addition, a heater is integrated in the

sensor to ensure the required operating temperature of about 800

°C

(1,472

°F).

On Board Diagnosis Logic

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To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1

signal fluctuates according to fuel feedback control.

DTC Confirmation Procedure

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Perform PROCEDURE FOR MALFUNCTION A first.

If the DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next step.
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 more than 11 V at idle.

PROCEDURE FOR MALFUNCTION A

1. Start engine and warm it up to normal operating temperature.

2. Let engine idle for 2 minutes.

3. Check 1st trip DTC.

4. If 1st trip DTC is detected, go to 

EC-138, "Diagnosis Procedure"

.

PBIB3353E

PBIB3354E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P0130
0130
(Bank 1)

Air fuel ratio (A/F) sensor 1 
circuit

A)

The A/F signal computed by ECM from the A/F 
sensor 1 signal is constantly in the range other 
than approx. 2.2 V.

• Harness or connectors

(The A/F sensor 1 circuit is open 
or shorted.)

• Air fuel ratio (A/F) sensor 1

P0150
0150
(Bank 2)

B)

The A/F signal computed by ECM from the A/F 
sensor 1 signal is constantly approx. 2.2 V.

EC-138

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P0130, P0150 A/F SENSOR 1

PROCEDURE FOR MALFUNCTION B

CAUTION:

Always drive vehicle at a safe speed.

 With CONSULT-III

1. Start engine and warm it up to normal operating temperature.

2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT-III.

3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.

If the indication is constantly approx. 2.2 V and does not fluctuates, go to 

EC-138, "Diagnosis Procedure"

.

If the indication fluctuates around 2.2 V, go to next step.

4. Select “A/F SEN1 (B1) P1276” (for DTC P0130) or “A/F SEN1 (B2) P1286” (for DTC P0150) of “A/F

SEN1” in “DTC WORK SUPPORT” mode with CONSULT-III.

5. Touch “START”.

6. When the following conditions are met, “TESTING” will be displayed on the CONSULT-III screen.

If “TESTING” is not displayed after 20 seconds, retry from step 2.

7. Release accelerator pedal fully.

NOTE:

Never apply brake during releasing the accelerator pedal.

8. Make sure that “TESTING” changes to “COMPLETED”.

If “TESTING” changed to “OUT OF CONDITION”, retry from step 6.

9. Make sure that “OK” is displayed after touching “SELF-DIAG RESULT”. 

If “NG” is displayed, go to 

EC-138, "Diagnosis Procedure"

.

Overall Function Check

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PROCEDURE FOR MALFUNCTION B

Use this procedure to check the overall function of the A/F sensor 1 circuit. During this check, a 1st trip DTC

might not be confirmed.

 With GST

1. Start engine and warm it up to normal operating temperature.

2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in the suitable gear position.

3. Set shift lever to D position, then release the accelerator pedal fully until the vehicle speed decreases to

50 km/h (30 MPH).

NOTE:

Never apply brake during releasing the accelerator pedal.

4. Repeat steps 2 and 3 for five times.

5. Stop the vehicle and turn ignition switch OFF.

6. Wait at least 10 seconds and restart engine.

7. Repeat steps 2 and 3 for five times.

8. Stop the vehicle and connect GST to the vehicle.

9. Make sure that no 1st trip DTC is displayed.

If the 1st trip DTC is displayed, go to 

EC-138, "Diagnosis Procedure"

.

Diagnosis Procedure

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1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body.

ENG SPEED

850 - 3,200 rpm

VHCL SPEED SE

More than 64 km/h (40 MPH)

B/FUEL SCHDL

1.0 - 8.0 msec

Shift lever

D position

P0130, P0150 A/F SENSOR 1

EC-139

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Refer to 

EC-85, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1. Disconnect A/F sensor 1 harness connector.

2. Turn ignition switch ON.

3. Check voltage between A/F sensor 1 terminal 4 and ground with

CONSULT-III or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E5, F14

• IPDM E/R harness connector E119

• 15A fuse (No. 54)

• Harness for open or short between A/F sensor 1 and fuse

>> Repair or replace harness or connectors.

4.

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between the following terminals. Refer to Wiring Diagram.

BBIA0354E

Voltage: Battery voltage

BBIA0376E

PBIB3308E

A/F sensor 1 terminal

ECM terminal

Bank1

1

35

2

56