Infiniti I30 (A33). Manual — part 215
4
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Check resistance between engine coolant temperature sensor terminals 1 and 2 as shown in the figure.
SEF304X
OK or NG
OK
©
GO TO 5.
NG
©
Replace engine coolant temperature sensor.
5
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-144.
©
INSPECTION END
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DTC P0115 ENGINE COOLANT TEMPERATURE SENSOR (ECTS) (CIRCUIT)
Diagnostic Procedure (Cont’d)
EC-175
Description
NHEC0074
NOTE:
If DTC P0120 is displayed with DTC P0510, first perform the trouble diagnosis for DTC P0510. Refer to
EC-438.
COMPONENT DESCRIPTION
NHEC0074S01
The throttle position sensor responds to the accelerator pedal movement. This sensor is a kind of potentiom-
eter which transforms the throttle position into output voltage, and emits the voltage signal to the ECM. In
addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal
to the ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sen-
sor. This sensor controls engine operation such as fuel cut. On the other hand, the “Wide open and closed
throttle position switch”, which is built into the throttle position sensor unit, is not used for engine control.
AEC929
CONSULT-II Reference Value in Data Monitor
Mode
NHEC0075
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
THRTL POS SEN
I
Engine: After warming up, idle
the engine
Throttle valve: fully closed
0.15 - 0.85V
I
Engine: After warming up
I
Ignition switch: ON
(Engine stopped)
Throttle valve: fully opened
3.5 - 4.7V
ABSOL TH·P/S
I
Engine: After warming up, idle
the engine
Throttle valve: fully closed
0.00%
I
Engine: After warming up
I
Ignition switch: ON
(Engine stopped)
Throttle valve: fully opened
Approx. 80.0%
DTC P0120 THROTTLE POSITION SENSOR
Description
EC-176
On Board Diagnosis Logic
NHEC0077
Malfunction is detected when
(Malfunction A) an excessively low or high voltage from the sen-
sor is sent to ECM,
(Malfunction B) a high voltage from the sensor is sent to ECM
under light load driving conditions,
(Malfunction C) a low voltage from the sensor is sent to ECM
under heavy load driving conditions.
FAIL-SAFE MODE
NHEC0077S02
When the malfunction A is detected, the ECM enters fail-safe mode
and the MIL lights up.
Detected items
Engine operating condition in fail-safe mode
Throttle position sensor
circuit
Throttle position will be determined based on the injected fuel amount and the engine speed.
Therefore, acceleration will be poor.
Condition
Driving condition
When engine is idling
Normal
When accelerating
Poor acceleration
Possible Cause
NHEC0430
MALFUNCTION A
NHEC0430S01
I
Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I
Throttle position sensor
MALFUNCTION B
NHEC0430S02
I
Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I
Throttle position sensor
I
Fuel injector
I
Crankshaft position sensor (REF)
I
Crankshaft position sensor (POS)
I
Mass air flow sensor
MALFUNCTION C
NHEC0430S03
I
Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I
Intake air leaks
I
Throttle position sensor
DTC Confirmation Procedure
NHEC0078
NOTE:
I
Perform “PROCEDURE FOR MALFUNCTION A” first. If the
1st trip DTC cannot be confirmed, perform “PROCEDURE
FOR MALFUNCTION B”.
If there is no problem on “PROCEDURE FOR MALFUNC-
TION B”, perform “PROCEDURE FOR MALFUNCTION C”.
I
If
“DTC
Confirmation
Procedure”
has
been
previously
conducted, always turn ignition switch “OFF” and wait at least
10 seconds before conducting the next test.
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DTC P0120 THROTTLE POSITION SENSOR
On Board Diagnosis Logic
EC-177
PROCEDURE FOR MALFUNCTION A
NHEC0078S01
CAUTION:
Always drive vehicle at a safe speed.
TESTING CONDITION:
I
Before performing the following procedure, confirm that
battery voltage is more than 10V at idle.
I
This test may be conducted with the drive wheels lifted in
the shop or by driving the vehicle. If a road test is
expected to be easier, it is unnecessary to lift the vehicle.
SEF065Y
With CONSULT-II
NHEC0078S0101
1)
Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.
2)
Start engine and maintain the following conditions for at least
5 consecutive seconds.
Vehicle speed
More than 4 km/h (2 MPH)
Selector lever
Suitable position except “P” or “N” position
3)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-182.
With GST
NHEC0078S0102
Follow the procedure “With CONSULT-II” above.
SEF058Y
PROCEDURE FOR MALFUNCTION B
NHEC0078S02
With CONSULT-II
NHEC0078S0201
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine and let it idle for at least 10 seconds.
If idle speed is over 1,000 rpm, maintain the following condi-
tions for at least 10 seconds to keep engine speed below 1,000
rpm.
Selector lever
Suitable position except “P” or “N”
Brake pedal
Depressed
Vehicle speed
0 km/h (0 MPH)
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-182.
With GST
NHEC0078S0202
Follow the procedure “With CONSULT-II” above.
DTC P0120 THROTTLE POSITION SENSOR
DTC Confirmation Procedure (Cont’d)
EC-178
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