Nissan Frontier D22. Manual — part 409
DTC P0117, P0118 ECT SENSOR
EC-739
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters in fail-safe mode and the MIL lights up.
DTC Confirmation Procedure
UBS00DGP
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Wait at least 5 seconds.
4.
If DTC is detected, go to
EC-741, "Diagnostic Procedure"
WITH GST
Follow the procedure “WITH CONSULT-II”.
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 time after turning ignition switch ON
or START.
CONSULT-II displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided
(CONSULT-II display)
Just as ignition switch is turned ON or START
40
°C (104°F)
More than approx. 4 minutes after ignition ON or
START
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.
SEF058Y
EC-740
[VG33E]
DTC P0117, P0118 ECT SENSOR
Wiring Diagram
UBS00DGQ
BBWA0472E
DTC P0117, P0118 ECT SENSOR
EC-741
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Diagnostic Procedure
UBS00DGR
1.
CHECK ECTS POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect engine coolant temperature (ECT) sensor harness
connector.
3.
Turn ignition switch ON.
4.
Check voltage between ECT sensor terminal 1 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness for open or short between ECM and engine coolant temperature sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.
CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check harness continuity between ECT sensor terminal 2 and engine ground.
Refer to Wiring Diagram.
3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness for open or short between ECM and engine coolant temperature sensor
>> Repair open circuit or short to power in harness or connectors.
AEC643A
Voltage: Approximately 5V
SEF206W
Continuity should exist.
EC-742
[VG33E]
DTC P0117, P0118 ECT SENSOR
5.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-742, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace engine coolant temperature sensor.
6.
CHECK INTERMITTENT INCIDENT
EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
Component Inspection
UBS00DGS
ENGINE COOLANT TEMPERATURE SENSOR
Check resistance as shown in the figure.
<Reference data>
Removal and Installation
UBS00DGT
ENGINE COOLANT TEMPERATURE SENSOR
EM-80, "OUTER COMPONENT PARTS"
SEF152P
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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