Infiniti FX35 / FX45. Manual — part 504
DTC P0112, P0113 IAT SENSOR
EC-777
< SERVICE INFORMATION >
[VK45DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect mass air flow sensor (intake air temperature sensor
is built-into) (1) harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between mass air flow sensor terminal 5 and
ground with CONSULT-III or tester.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.
3.
CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between mass air flow sensor terminal 6 and ECM terminal 67.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK INTAKE AIR TEMPERATURE SENSOR
EC-778, "Component Inspection"
OK or NG
OK
>> GO TO 5.
NG
>> Replace mass air flow sensor (with intake air temperature sensor).
PBIB2195E
PBIB3230E
Voltage: Approximately 5V
PBIB1169E
Continuity should exist.
EC-778
< SERVICE INFORMATION >
[VK45DE]
DTC P0112, P0113 IAT SENSOR
5.
CHECK INTERMITTENT INCIDENT
>> INSPECTION END
Component Inspection
INFOID:0000000001326608
INTAKE AIR TEMPERATURE SENSOR
1.
Check resistance between intake air temperature terminals 5
and 6 under the following conditions.
2.
If NG, replace mass air flow sensor (with intake air temperature
sensor).
Removal and Installation
INFOID:0000000001326609
MASS AIR FLOW SENSOR
.
Intake air temperature
°
C (
°
F)
Resistance k
Ω
25 (77)
1.800 - 2.200
PBIB1604E
SEF012P
DTC P0117, P0118 ECT SENSOR
EC-779
< SERVICE INFORMATION >
[VK45DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
DTC P0117, P0118 ECT SENSOR
Component Description
INFOID:0000000001326610
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 terminal 73
(Engine coolant temperature sensor) and ground.
CAUTION:
Do not 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:0000000001326611
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
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
P0117
0117
Engine coolant temperature
sensor circuit low input
An excessively low voltage from the sensor
is sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted.)
• Engine coolant temperature sensor
P0118
0118
Engine coolant temperature
sensor circuit high input
An excessively high voltage from the sensor
is sent to ECM.
Detected items
Engine operating condition in fail-safe mode
Engine coolant temper-
ature sensor circuit
Engine coolant temperature will be determined by ECM based on the following conditions.
CONSULT-III displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided
(CONSULT-III display)
Just as ignition switch is turned ON or START
40
°
C (104
°
F)
Approx. 4 minutes or more after engine starting
80
°
C (176
°
F)
Except as shown above
40 - 80
°
C (104 - 176
°
F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates while
engine is running.
EC-780
< SERVICE INFORMATION >
[VK45DE]
DTC P0117, P0118 ECT SENSOR
DTC Confirmation Procedure
INFOID:0000000001326612
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
1.
Turn ignition switch ON and wait at least 5 seconds.
2.
Check DTC.
3.
If DTC is detected, go to
.
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