Infiniti G37 Coupe. Manual — part 501
P0117, P0118 ECT SENSOR
EC-185
< COMPONENT DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001734014
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection M95. Refer to Ground Inspection in
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK ECT SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect engine coolant temperature (ECT) sensor harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between ECT sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F106, F107
• Harness for open or short between engine coolant temperature sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between ECT sensor harness connector and ECM harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-186, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace engine coolant temperature sensor.
6.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
.
>> INSPECTION END
ECT sensor
Ground
Voltage
Connector
Terminal
F17
1
Ground
Approx. 5V
ECT sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
F17
2
F102
84
Existed
EC-186
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P0117, P0118 ECT SENSOR
Component Inspection
INFOID:0000000001734015
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
1 and 2
Temperature
°
C (
°
F)
20 (68)
2.37 - 2.63 k
Ω
50 (122)
0.68 - 1.00 k
Ω
90 (194)
0.236 - 0.260 k
Ω
JMBIA0080ZZ
P0122, P0123, P0227, P0228 TP SENSOR
EC-187
< COMPONENT DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P0122, P0123, P0227, P0228 TP SENSOR
Description
INFOID:0000000001734016
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to
the throttle valve movement.
The throttle position sensor has two sensors. These sensors are a
kind of potentiometers which transform the throttle valve position into
output voltage, and emit the voltage signal to the ECM. In addition,
these sensors detect the opening and closing speed of the throttle
valve and feed the voltage signals to the ECM. The ECM judges the
current opening angle of the throttle valve from these signals and the
ECM controls the throttle control motor to make the throttle valve
opening angle properly in response to driving condition.
DTC Logic
INFOID:0000000001734017
DTC DETECTION LOGIC
NOTE:
If DTC P0122, P0123, P0227 or P0228 is displayed with DTC P0643, first perform the trouble diagnosis
for DTC P0643. 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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine and let it idle for 1 second.
2.
Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
PBIB0145E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0122
Throttle position sensor
2 (bank 1) circuit low in-
put
An excessively low voltage from the TP sensor
2 is sent to ECM.
• Harness or connectors
(TP sensor 2 circuit is open or shorted.)
• Electric throttle control actuator
(TP sensor 2)
P0123
Throttle position sensor
2 (bank 1) circuit high in-
put
An excessively high voltage from the TP sensor
2 is sent to ECM.
P0227
Throttle position sensor
2 (bank 2) circuit low in-
put
An excessively low voltage from the TP sensor
2 is sent to ECM.
P0228
Throttle position sensor
2 (bank 2) circuit high in-
put
An excessively high voltage from the TP sensor
2 is sent to ECM.
EC-188
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P0122, P0123, P0227, P0228 TP SENSOR
Diagnosis Procedure
INFOID:0000000001734018
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection M95. Refer to Ground Inspection in
Is the inspection result normal?
YES
>> GO TO 2.
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 harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair open circuit or 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 or 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 or short to ground or short to power in harness or connectors.
5.
CHECK THROTTLE POSITION SENSOR
EC-189, "Component Inspection"
DTC
Electric throttle control actuator
Ground
Voltage
Bank
Connector
Terminal
P0122, P0123
1
F6
6
Ground
Approx. 5V
P0227, P0228
2
F27
1
DTC
Electric throttle control actuator
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0122, P0123
1
F6
3
F101
40
Existed
P0227, P0228
2
F27
4
48
DTC
Electric throttle control actuator
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0122, P0123
1
F6
5
F101
34
Existed
P0227, P0228
2
F27
3
35
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