Infiniti I35 (A33). Manual — part 216
3
DETECT MALFUNCTIONING PART
Check harness for open or short between ECM and intake air temperature sensor.
©
Repair harness or connectors.
4
CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between sensor terminal 3 and ECM terminal 80.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
5
DETECT MALFUNCTIONING PART
Check harness for open between ECM and intake air temperature sensor.
©
Repair open circuit or short to power in harness or connectors.
6
CHECK INTAKE AIR TEMPERATURE SENSOR
Check resistance between intake air temperature sensor terminals 3 and 5 as shown in the figure.
MTBL1143
SEF012P
OK or NG
OK
©
GO TO 7.
NG
©
Replace intake air temperature sensor.
7
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-152.
©
INSPECTION END
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0112, P0113 IAT SENSOR
Diagnostic Procedure (Cont’d)
EC-205
SEF594K
Component Description
NHEC0857
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
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
*: This data is reference value and is measured between ECM terminal 93 (Engine
coolant temperature sensor) and 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
NHEC1431
These self-diagnoses have the one trip detection logic.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition
Possible Cause
P0117
0117
Engine coolant tem-
perature sensor cir-
cuit low input
An excessively low voltage from the sensor is sent
to ECM.
I
Harness or connectors
(The sensor circuit is open or
shorted.)
I
Engine coolant temperature sensor
P0118
0118
Engine coolant tem-
perature sensor cir-
cuit high input
An excessively high voltage from the sensor is
sent to ECM.
FAIL-SAFE MODE
NHEC1431S01
When this malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC P0117, P0118 ECT SENSOR
Component Description
EC-206
Detected items
Engine operating condition in fail-safe mode
Engine coolant tem-
perature 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
DTC Confirmation Procedure
NHEC1432
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
NHEC1432S01
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 “Diagnostic Procedure”, EC-209.
WITH GST
NHEC1432S02
Follow the procedure “WITH CONSULT-II” above.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0117, P0118 ECT SENSOR
On Board Diagnosis Logic (Cont’d)
EC-207
Wiring Diagram
NHEC0860
MEC632E
DTC P0117, P0118 ECT SENSOR
Wiring Diagram
EC-208
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст