Nissan Pathfinder. Manual — part 477
EC-214
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0128 THERMOSTAT FUNCTION
P0128 THERMOSTAT FUNCTION
DTC Logic
INFOID:0000000009178144
DTC DETECTION LOGIC
NOTE:
If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303, P0304, P0305 or P0306, first perform
the trouble diagnosis for P0300, P0301, P0302, P0303, P0304, P0305, and P0306. 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 leak in the seal or the thermostat being stuck open.
DTC CONFIRMATION PROCEDURE
NOTE:
Never refuel before and during the following procedure.
1.
PRECONDITIONING-I
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
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.
PRECONDITIONING-II
With CONSULT
1. Turn ignition switch ON.
2. Check the following conditions:
3. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
4. Check the following conditions:
Is the condition satisfied?
YES
>> GO TO 3.
NO
>> 1. Satisfy the condition.
2. GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-I
With CONSULT
1. Start engine.
2. Drive the vehicle until the following condition is satisfied.
CAUTION:
Always drive vehicle at safe speed.
-
STEP 1
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0128
THERMSTAT FNCTN
[Coolant thermostat (coolant
temperature below thermostat
regulating temperature)]
The engine coolant temperature does not
reach to specified temperature even though
the engine has run long enough.
• Thermostat
• Leakage from sealing portion of ther-
mostat
• Engine coolant temperature sensor
Ambient temperature
−10°C (14°F) or more
A/C switch
OFF
Blower fan switch
OFF
COOLANT TEMP/S
−10°C – 55°C (14 – 131°F)
P0128 THERMOSTAT FUNCTION
EC-215
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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Drive the vehicle under the conditions instructed below until the difference between “COOLANT TEMP/S”
and “FUEL T/TMP SE” becomes at least 25
°C (45°F).
*: Example
-
STEP 2
Drive the vehicle at 50 km/h (32 MPH) or more with the difference between “COOLANT TEMP/S” and “FUEL
T/TMP SE” maintained at 25
°C (45°F) or more.
NOTE:
Keep the accelerator pedal as steady as possible during cruising.
-
STEP 3
Drive the vehicle at 50 km/h (32 MPH) or more until “COOLANT TEMP/S” increases by 6
°C (43°F).
NOTE:
Keep the accelerator pedal as steady as possible during cruising.
Is the condition satisfied?
YES
>> GO TO 4.
NO
>> GO TO 1.
4.
PERFORM DTC CONFIRMATION PROCEDURE-II
With CONSULT
1. Drive the vehicle until the following condition is satisfied.
CAUTION:
Always drive vehicle at safe speed.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009178145
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Check engine coolant temperature sensor. Refer to
EC-215, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace engine coolant temperature sensor.
2.
CHECK THERMOSTAT
Check thermostat. Refer to
CO-24, "Removal and Installation"
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace thermostat. Refer to
CO-24, "Removal and Installation"
Component Inspection
INFOID:0000000009178146
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
COOLANT TEMP/S
74
°C (165°F) or less
FUEL T/TMP SE
Less than the value calculated by sub-
tracting 25
°C (45°F) from “COOLANT
TEMP/S”.*
COOLANT TEMP/S
FUEL T/TMP SE
70
°C (158°F)
45
°C (113°F) or less
65
°C (149°F)
40
°C (104°F) or less
60
°C (140°F)
35
°C (95°F) or less
COOLANT TEMP/S
71
°C (160°F) or more
EC-216
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0128 THERMOSTAT FUNCTION
1. Turn ignition switch OFF.
2. Disconnect engine coolant temperature sensor harness connector.
3. Remove engine coolant temperature sensor. Refer to
CO-26, "Removal and Installation"
.
4. Check resistance between engine coolant temperature sensor
terminals as per the following.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace engine coolant temperature sensor. Refer to
CO-26, "Removal and Installation"
ECT sensor
Condition
Resistance
(k
Ω)
+
−
Terminal
1
2
Temperature [
°C (°F)]
20 (68)
2.37 - 2.63
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
JMBIA0080ZZ
P0130, P0150 A/F SENSOR 1
EC-217
< DTC/CIRCUIT DIAGNOSIS >
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P0130, P0150 A/F SENSOR 1
DTC Logic
INFOID:0000000009178147
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
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
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.
>> 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
>> Proceed to
.
NO-1 >> With CONSULT: GO TO 3.
NO-2 >> With GST: GO TO 7.
3.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
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.
3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
Does the indication fluctuate around 2.2 V?
YES
>> GO TO 4.
NO
>> Proceed 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.
2. Touch “START”.
3. When the following conditions are met, “TESTING” will be displayed on the CONSULT screen.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0130
A/F SENSOR1 (B1)
(O2 sensor circuit bank 1
sensor 1)
A)
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly in a range other
than approx. 2.2 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. 2.2 V.
P0150
A/F SENSOR1 (B2)
(O2 sensor circuit bank 2
sensor 1)
A)
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly in a range other
than approx. 2.2 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. 2.2 V.
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