Nissan Maxima. Manual — part 431
EC-208
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0122, P0123 TP SENSOR
NO
>> Repair or replace ground connection.
2.
CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT
1. Disconnect electric throttle control actuator harness connector.
2. Turn ignition switch ON.
3. Check the voltage between electric throttle control actuator har-
ness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair open circuit, short to ground or short to power in
harness or connectors.
3.
CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.
CHECK THROTTLE POSITION SENSOR
EC-209, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to
EM-25, "Removal and Installation"
2. Refer to
EC-209, "Special Repair Requirement"
>> INSPECTION END
Electric throttle control actuator
Ground
Voltage
Connector
Terminal
F57
1
Ground
Approx. 5 V
PBIB3484E
Electric throttle control actuator
ECM
Continuity
Connector
Terminal
Connector
Terminal
F57
4
F13
36
Existed
Electric throttle control actuator
ECM
Continuity
Connector
Terminal
Connector
Terminal
F57
3
F13
38
Existed
P0122, P0123 TP SENSOR
EC-209
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
7.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000010094916
1.
CHECK THROTTLE POSITION SENSOR
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Perform
EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
.
4. Turn ignition switch ON.
5. Set selector lever to D position.
6. Check the voltage between ECM harness connector terminals
under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace electric throttle control actuator. Refer to
EM-25, "Removal and Installation"
.
2. Go to
EC-209, "Special Repair Requirement"
.
>> INSPECTION END
Special Repair Requirement
INFOID:0000000010094917
1.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
EC-21, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
>> GO TO 2.
2.
PERFORM IDLE AIR VOLUME LEARNING
EC-21, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"
>> END
ECM
Condition
Voltage
Con-
nector
+
–
Terminal
Terminal
F13
37
(TP sensor
1 signal)
36
(Sensor
ground)
Accelera-
tor pedal
Fully released
More than 0.36 V
Fully depressed
Less than 4.75 V
38
(TP sensor
2 signal)
Fully released
Less than 4.75 V
Fully depressed More than 0.36 V
JMBIA1864ZZ
EC-210
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0125 ECT SENSOR
P0125 ECT SENSOR
Description
INFOID:0000000010094918
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>
*: These data are reference values and are measured between ECM terminals 46
(Engine coolant temperature sensor) and 52 (Sensor ground).
DTC Logic
INFOID:0000000010094919
DTC DETECTION LOGIC
NOTE:
• If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116. Refer to
.
• If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117,
P0118. Refer to
.
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.
>> GO TO 2.
2.
CHECK ENGINE COOLANT TEMPERATURE SENSOR FUNCTION
With CONSULT
1. Turn ignition switch ON.
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
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
P0125 ECT SENSOR
EC-211
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
2. Select “DATA MONITOR” mode with CONSULT.
3. Check that “COOLAN TEMP/S” is above 10
°C (50°F).
With GST
Follow the procedure “With CONSULT” above.
Is the temperature above 10
°C (50°F)?
YES
>> INSPECTION END
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Start engine and run it for 65 minutes at idle speed.
If “COOLAN TEMP/S” increases to more than 10
°C (50°F) within 65 minutes, stop engine because
the test result will be OK.
CAUTION:
Never overheat engine.
2. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES
>>
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010094920
1.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-211, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace engine coolant temperature sensor. Refer to
CO-24, "Removal and Installation"
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.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace thermostat. Refer to
CO-22, "Removal and Installation"
4.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000010094921
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. Refer to
CO-24, "Removal and Installation"
.
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