Infiniti G20 (P11). Manual — part 262
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Diagnostic Procedure
NCEC0571
1
CHECK ENGINE COOLANT TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Remove engine coolant temperature sensor.
3. Check resistance between engine coolant temperature sensor terminals under the following conditions.
SEF304X
OK or NG
OK
©
INSPECTION END
NG
©
Replace engine coolant temperature sensor.
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LC
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CL
MT
AT
AX
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BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1126 THERMOSTAT FUNCTION
Diagnostic Procedure
EC-459
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On Board Diagnosis Logic
NCEC0307
★
The closed loop control has the one trip detection logic.
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P1148
I
The closed loop control function does not operate even
when vehicle is driving in the specified condition.
I
The heated oxygen sensor 1 (front) circuit is
open or shorted.
I
Heated oxygen sensor 1 (front)
I
Heated oxygen sensor 1 heater (front)
SEF682Y
DTC Confirmation Procedure
NCEC0308
CAUTION:
Always drive vehicle at a safe speed.
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.
TESTING CONDITION:
I
Never raise engine speed above 3,200 rpm during the
“DTC Confirmation Procedure”. If the engine speed limit is
exceeded, retry the procedure from step 4.
I
Before performing the following procedure, confirm that
battery voltage is more than 11V at idle.
With CONSULT-II
1)
Start engine and warm it up to normal operating temperature.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Hold engine speed at 2,000 rpm and check the following.
I
“HO2S1 (B1)” voltage should go above 0.70V at least once.
I
“HO2S1 (B1)” voltage should go below 0.21V at least once.
If the result is NG, perform “Diagnosis Procedure”, EC-461.
If the result is OK, perform the following step.
4)
Let engine idle at least 4 minutes.
5)
Maintain the following condition at least 50 consecutive sec-
onds.
B/FUEL SCHDL
More than 2.4 msec
ENG SPEED
More than 1,500 rpm
Selector lever
Suitable position
VHCL SPEED SE
More than 71 km/h (44 MPH)
During this test, P0130 DTC may be displayed on CON-
SULT-II screen.
6)
If DTC is detected, go to “Diagnostic Procedure”, EC-461.
DTC P1148 CLOSED LOOP CONTROL
On Board Diagnosis Logic
EC-460
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SEF011X
Overall Function Check
NCEC0309
Use this procedure to check the overall function of the closed loop
control. During this check, a DTC might not be confirmed.
With GST
1)
Start engine and warm it up to normal operating temperature.
2)
Set voltmeter probes between ECM terminal 62 [Heated oxy-
gen sensor 1 (front) signal] and engine ground.
3)
Check the following with engine speed held at 2,000 rpm con-
stant under no load.
I
The voltage should go above 0.70V at least once.
I
The voltage should go below 0.21V at least once.
4)
If NG, go to “Diagnostic Procedure”, EC-461.
Diagnostic Procedure
NCEC0310
Refer to “Diagnostic Procedure” for DTC P0133, EC-221.
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LC
FE
CL
MT
AT
AX
SU
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ST
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BT
HA
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EL
IDX
DTC P1148 CLOSED LOOP CONTROL
Overall Function Check
EC-461
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System Description
NCEC0433
COOLING FAN CONTROL
NCEC0433S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Vehicle speed sensor
Vehicle speed
ECM
Cooling fan relay(s)
Engine coolant temperature sensor
Engine coolant temperature
Air conditioner switch
Air conditioner “ON” signal
Ignition switch
Start signal
Refrigerant pressure sensor
Refrigerant pressure
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refriger-
ant pressure, and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].
OPERATION
NCEC0433S02
SEF932X
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0486
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
AIR COND SIG
I
Engine: After warming up, idle
the engine
Air conditioner switch: OFF
OFF
Air conditioner switch: ON
(Compressor operates)
ON
DTC P1217 ENGINE OVER TEMPERATURE (OVERHEAT)
System Description
EC-462
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