Infiniti QX56 (Z62). Manual — part 562
EC-226
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0128 THERMOSTAT FUNCTION
P0128 THERMOSTAT FUNCTION
DTC Logic
INFOID:0000000006288286
DTC DETECTION LOGIC
NOTE:
If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308,
first perform the trouble diagnosis for DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307,
P0308. Refer to
Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long
enough.
This is due to a leakage in the seal or the thermostat being stuck open.
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:
• For best results, perform at ambient temperature of –10
°
C (14
°
F) or higher.
• For best results, perform at engine coolant temperature of –10
°
C (14
°
F) to 52
°
C (126
°
F).
• Before performing the following procedure, do not add fuel.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
WITH CONSULT-III
1.
Turn A/C switch OFF.
2.
Turn blower fan switch OFF.
3.
Turn ignition switch ON.
4.
Select “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT-III.
5.
Check the indication of “COOLAN TEMP/S”.
If it is below 52
°
C (126
°
F), go to next step.
If it is above 52
°
C (126
°
F), cool engine down to less than 52
°
C (126
°
F). Then go to next step.
6.
Start engine and drive vehicle for 10 consecutive minutes under the following conditions.
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “COOLAN TEMP/S” increases to more than 71
°
C (160
°
F) within 10 minutes, turn ignition switch
OFF because the test result will be OK.
7.
Check 1st trip DTC.
WITH GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0128
THERMSTAT FNCTN
(Thermostat function)
The engine coolant temperature does not
reach to specified temperature even
though the engine has run long enough.
• Thermostat
• Leakage from sealing portion of thermostat
• Engine coolant temperature sensor
Vehicle speed
More than 56 km/h (35 MPH)
P0128 THERMOSTAT FUNCTION
EC-227
< DTC/CIRCUIT DIAGNOSIS >
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Diagnosis Procedure
INFOID:0000000006288287
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-227, "Component Inspection (Engine Coolant Temperature Sensor)"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace engine coolant temperature sensor.
2.
CHECK THERMOSTAT
Remove and Check the thermostat. Refer to
CO-20, "Removal and Installation"
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace thermostat.
Component Inspection (Engine Coolant Temperature Sensor)
INFOID:0000000006288288
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.
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
EC-228
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0130, P0150 A/F SENSOR 1
P0130, P0150 A/F SENSOR 1
DTC Logic
INFOID:0000000006217804
DTC DETECTION LOGIC
To judge malfunctions, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 sig-
nal fluctuates according to fuel feedback control.
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 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.
Is 1st trip DTC detected?
YES
>> Go to
NO-1
>> With CONSULT-III: GO TO 3.
NO-2
>> With GST: GO TO 7.
3.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
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.
Does the indication fluctuate around 1.5 V?
YES
>> GO TO 4.
NO
>> Go to
4.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-I
1.
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.
2.
Touch “START”.
3.
When the following conditions are met, “TESTING” will be displayed on the CONSULT-III screen.
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible Cause
P0130
A/F SENSOR1 (B1)
[Air fuel ratio (A/F) sensor 1
(bank 1) circuit]
A)
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly in a range other
than approx. 1.5 V.
• Harness or connectors
(The A/F sensor 1 circuit is open
or shorted.)
• A/F sensor 1
B)
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly approx. 1.5 V.
P0150
A/F SENSOR1 (B2)
[Air fuel ratio (A/F) sensor 1
(bank 2) circuit]
A)
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly in a range other
than approx. 1.5 V.
B)
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly approx. 1.5 V.
P0130, P0150 A/F SENSOR 1
EC-229
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If “TESTING” is not displayed after 20 seconds, retry from step 2.
CAUTION:
Always drive vehicle at a safe speed.
Is “TESTING” displayed on CONSULT-III screen?
YES
>> GO TO 5.
NO
>> Check A/F sensor 1 function again. GO TO 3.
5.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-II
Release accelerator pedal fully.
NOTE:
Never apply brake when releasing the accelerator pedal.
Which does “TESTING” change to?
COMPLETED>>GO TO 6.
OUT OF CONDITION>>Retry DTC CONFIRMATION PROCEDURE. GO TO 4.
6.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-III
Touch “SELF-DIAG RESULT”.
Which is displayed on CONSULT-III screen?
YES
>> INSPECTION END
NO
>> Go to
7.
PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B
WITH GST
Perform component function check. Refer to
EC-229, "Component Function Check"
.
NOTE:
Use component function check to check the overall function of the A/F sensor 1 circuit. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Component Function Check
INFOID:0000000006217805
1.
PERFORM COMPONENT FUNCTION CHECK
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.
Shift the selector lever position to D, then release the accelerator pedal fully until the vehicle speed
decreases to 50 km/h (31 MPH).
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
Never apply brake when releasing the accelerator pedal.
4.
Repeat steps 2 and 3 for 5 times.
5.
Stop the vehicle and turn ignition switch OFF.
6.
Wait at least 10 seconds and turn ignition switch ON.
7.
Turn ignition switch OFF and wait at least 10 seconds.
8.
Restart engine.
9.
Repeat steps 2 and 3 for 5 times.
10. Stop the vehicle.
11. Check 1st trip DTC.
ENG SPEED
1,750 - 3,200 rpm
VHCL SPEED SE
More than 64 km/h (40 mph)
B/FUEL SCHDL
1.0 - 8.0 msec
Selector lever
D position
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