Nissan Frontier. Instruction — part 521
P0122, P0123 TP SENSOR
EC-655
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
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5.
CHECK APP SENSOR
EC-906, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 6.
6.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly. Refer to
2. Perform
EC-590, "Accelerator Pedal Released Position Learning"
.
3. Perform
EC-591, "Throttle Valve Closed Position Learning"
4. Perform
EC-591, "Idle Air Volume Learning"
.
>> INSPECTION END
7.
CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between electric throttle control actuator terminal 4 and ECM terminal 19.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 8.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 23 and electric throttle control actuator terminal 3.
Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 9.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK THROTTLE POSITION SENSOR
EC-656, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator. Refer to
.
2. Perform
EC-591, "Throttle Valve Closed Position Learning"
3. Perform
EC-591, "Idle Air Volume Learning"
.
>> INSPECTION END
11.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Continuity should exist.
Continuity should exist.
EC-656
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
P0122, P0123 TP SENSOR
Component Inspection
INFOID:0000000009481307
THROTTLE POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform
EC-591, "Throttle Valve Closed Position Learning"
3. Turn ignition switch ON.
4. Set selector lever to D position (A/T), 1st position (M/T)
5. Check voltage between ECM terminals 22 (TP sensor 1 signal), 23 (TP sensor 2 signal) and ground under
the following conditions.
6. If NG, replace electric throttle control actuator and go to the next step.
7. Perform
EC-591, "Throttle Valve Closed Position Learning"
8. Perform
EC-591, "Idle Air Volume Learning"
.
Terminal
Accelerator pedal
Voltage
22
(Throttle position sensor 1)
Fully released
More than 0.36V
Fully depressed
Less than 4.75V
23
(Throttle position sensor 2)
Fully released
Less than 4.75V
Fully depressed
More than 0.36V
P0125 ECT SENSOR
EC-657
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
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P0125 ECT SENSOR
Component Description
INFOID:0000000009481308
The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.
<Reference data>
*: This data is reference value and is measured between ECM terminal 70 (Engine
coolant temperature sensor) and ground.
CAUTION:
Never use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis Logic
INFOID:0000000009481309
NOTE:
If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116. Refer to
NOTE:
If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or
P0118. Refer to
EC-650, "Component Description"
DTC Confirmation Procedure
INFOID:0000000009481310
CAUTION:
Never overheat engine.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing 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.
WITH CONSULT
SEF594K
Engine coolant temperature [
°C (°F)]
Voltage* (V)
Resistance (k
Ω)
-10 (14)
4.4
7.0 - 11.4
20 (68)
3.5
2.1 - 2.9
50 (122)
2.2
0.68 - 1.00
90 (194)
0.9
0.236 - 0.260
SEF012P
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0125
0125
Insufficient engine cool-
ant temperature for
closed loop fuel control
• Voltage sent to ECM from the sensor is not
practical, even when some time has passed
after starting the engine.
• Engine coolant temperature is insufficient for
closed loop fuel control.
• Harness or connectors
(High resistance in the circuit)
• Engine coolant temperature sensor
• Thermostat
EC-658
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
P0125 ECT SENSOR
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT.
3. Check that “COOLAN TEMP/S” is above –10
°C (14°F).
If the temperature is above –10
°C (14°F), the test result will be OK.
If the temperature is below –10
°C (14°F), go to following step.
4. Start engine and run it for 65 minutes at idle speed.
If “COOLAN TEMP/S” increases to more than –10
°C (14°F) within 65 minutes, stop engine because
the test result will be OK.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT” above.
Diagnosis Procedure
INFOID:0000000009481311
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-658, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace engine coolant temperature sensor. Refer to
3.
CHECK THERMOSTAT OPERATION
When the engine is cold [lower than 70
°C (158°F)] condition, grasp lower radiator hose and confirm that the
engine coolant does not flow.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace thermostat. Refer to
CO-55, "Removal and Installation"
4.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000009481312
ENGINE COOLANT TEMPERATURE SENSOR
1. Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.
JMBIA0080ZZ
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