Nissan Titan. Instruction — part 225
P0127 IAT SENSOR
EC-201
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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• Perform the following steps before engine coolant temperature is above 90
°C (194°F).
5. Turn ignition switch ON.
6. Select “DATA MONITOR” mode with CONSULT.
7. Start engine.
8. Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds.
9. Check 1st trip DTC.
10. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000009886608
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK INTAKE AIR TEMPERATURE SENSOR
EC-201, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace mass air flow sensor (with intake air temperature sensor).
3.
CHECK INTERMITTENT INCIDENT
GI-39, "How to Check Terminal"
GI-42, "Intermittent Incident"
For wiring diagram, refer to
>> INSPECTION END
Component Inspection
INFOID:0000000009886609
INTAKE AIR TEMPERATURE SENSOR
1. Check resistance between intake air temperature sensor termi-
nals 5 and 6 under the following conditions.
2. If NG, replace mass air flow sensor (with intake air temperature
sensor).
BBIA0354E
Intake air temperature
°C (°F)]
Resistance (k
Ω)
25 (77)
1.800 - 2.200
BBIA0355E
EC-202
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0127 IAT SENSOR
SEF012P
P0128 THERMOSTAT FUNCTION
EC-203
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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P0128 THERMOSTAT FUNCTION
On Board Diagnosis Logic
INFOID:0000000009886610
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
EC-262, "DTC Confirmation Procedure"
.
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 stuck open.
DTC Confirmation Procedure
INFOID:0000000009886611
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich 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 fill with the fuel.
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.
5. Check the indication of “COOLAN TEMP/S”.
6. If it is below 52
°C (126°F), go to following step.
7. If it is above 52
°C (126°F), cool down the engine to less than 52°C (126°F). Then go to next steps.
8. Start engine and wait at idle for at least 30 minutes.
If “COOLAN TEMP/S” increases to more than 71
°C (160°F) within 30 minutes, turn ignition switch
OFF because the test result will be OK.
9. Check 1st trip DTC.
10. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000009886612
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-204, "Component Inspection"
OK or NG
OK
>> GO TO 2.
NG
>> Replace engine coolant temperature sensor.
2.
CHECK THERMOSTAT
CO-22, "Removal and Installation"
.
OK or NG
OK
>> INSPECTION END
NG
>> Replace thermostat.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0128
0128
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
EC-204
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0128 THERMOSTAT FUNCTION
Component Inspection
INFOID:0000000009886613
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
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