Infiniti I30 (A33). Manual — part 218
Description
NHEC0081
NOTE:
If DTC P0125 is displayed with P0115, first perform the trouble
diagnosis for DTC P0115. Refer to EC-171.
SEF594K
COMPONENT DESCRIPTION
NHEC0081S01
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 thermistor decreases as temperature increases.
SEF012P
<Reference data>
Engine coolant
temperature
°C (°F)
Voltage*
V
Resistance
k
Ω
−10 (14)
4.4
9.2
20 (68)
3.5
2.1 - 2.9
50 (122)
2.2
0.68 - 1.00
90 (194)
0.9
0.236 - 0.260
*: These data are reference values and are measured between ECM terminal 70
(Engine coolant temperature sensor) and body ground.
CAUTION:
Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM’s
transistor. Use a ground other than ECM terminals, such as
the ground.
On Board Diagnosis Logic
NHEC0082
Malfunction is detected when voltage sent to ECM from the sen-
sor is not practical, even when some time has passed after start-
ing the engine, or engine coolant temperature is insufficient for
closed loop fuel control.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0125 ENGINE COOLANT TEMPERATURE SENSOR (ECTS)
Description
EC-187
Possible Cause
NHEC0431
I
Harness or connectors
(High resistance in the circuit)
I
Engine coolant temperature sensor
I
Thermostat
SEF174Y
DTC Confirmation Procedure
NHEC0083
CAUTION:
Be careful not to overheat engine.
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.
WITH CONSULT-II
NHEC0083S01
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Check that “COOLAN TEMP/S” is above 10°C (50°F).
If it is above 10°C (50°F), the test result will be OK.
If it is below 10°C (50°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 (50°F)
within 65 minutes, stop engine because the test result will
be OK.
5)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-190.
WITH GST
NHEC0083S02
Follow the procedure “WITH CONSULT-II” above.
DTC P0125 ENGINE COOLANT TEMPERATURE SENSOR (ECTS)
Possible Cause
EC-188
Wiring Diagram
NHEC0084
MEC802C
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0125 ENGINE COOLANT TEMPERATURE SENSOR (ECTS)
Wiring Diagram
EC-189
Diagnostic Procedure
NHEC0085
1
CHECK ECTS POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect engine coolant temperature sensor harness connector.
SEC005C
3. Turn ignition switch “ON”.
4. Check voltage between ECTS terminal 1 and ground with CONSULT-II or tester.
SEF303X
OK or NG
OK
©
GO TO 2.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
2
CHECK ECTS GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between ECTS terminal 2 and engine ground.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
3
DETECT MALFUNCTIONING PART
Check the following.
I
Harness for open or short between ECM and engine coolant temperature sensor
I
Harness for open or short between TCM (Transmission Control Module) and engine coolant temperature sensor
©
Repair open circuit or short to power in harness or connectors.
DTC P0125 ENGINE COOLANT TEMPERATURE SENSOR (ECTS)
Diagnostic Procedure
EC-190
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст