Infiniti QX4 (R50). Manual — part 177
ECM Terminals and Reference Value
=NBEC0651
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
91
R
Throttle position sensor
[Engine is running]
I
Warm-up condition
I
Accelerator pedal fully released
0.15 - 0.85V
[Ignition switch “ON”]
I
Accelerator pedal fully depressed
3.5 - 4.7V
111
P/B
Sensors’ power supply
[Ignition switch “ON”]
Approximately 5V
58
B/P
Sensors’ ground
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 0V
On Board Diagnosis Logic
NBEC0077
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
NBEC0077S02
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
NBEC0430
MALFUNCTION A
NBEC0430S01
I
Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I
Throttle position sensor
MALFUNCTION B
NBEC0430S02
I
Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I
Throttle position sensor
I
Fuel injector
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 THROTTLE POSITION SENSOR
ECM Terminals and Reference Value
EC-175
I
Crankshaft position sensor (REF)
I
Crankshaft position sensor (POS)
I
Mass air flow sensor
MALFUNCTION C
NBEC0430S03
I
Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I
Intake air leaks
I
Throttle position sensor
DTC Confirmation Procedure
NBEC0078
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.
PROCEDURE FOR MALFUNCTION A
NBEC0078S01
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
NBEC0078S0101
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 5 km/h (3 MPH)
Selector lever
Suitable position except “P” or “N” position
3)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-181.
With GST
NBEC0078S0102
Follow the procedure “With CONSULT-II” above.
DTC P0120 THROTTLE POSITION SENSOR
Possible Cause (Cont’d)
EC-176
SEF058Y
PROCEDURE FOR MALFUNCTION B
NBEC0078S02
With CONSULT-II
NBEC0078S0201
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-181.
With GST
NBEC0078S0202
Follow the procedure “With CONSULT-II” above.
SEF177Y
PROCEDURE FOR MALFUNCTION C
NBEC0078S03
CAUTION:
Always drive vehicle at a safe speed.
With CONSULT-II
NBEC0078S0301
1)
Start engine and warm it up to normal operating temperature.
2)
Turn ignition switch “OFF” and wait at least 10 seconds.
3)
Turn ignition switch “ON”.
4)
Select “MANU TRIG” in “DATA MONITOR” mode with CON-
SULT-II.
5)
Select “THRTL POS SEN” and “ABSOL TH·P/S” in “DATA
MONITOR” mode with CONSULT-II.
6)
Press RECORD on CONSULT-II SCREEN at the same time
accelerator pedal is depressed.
7)
Print out the recorded graph and check the following:
I
The voltage rise is linear in response to accelerator pedal
depression.
I
The voltage when accelerator pedal is fully depressed is
approximately 4V.
If NG, go to “Diagnostic Procedure”, EC-181.
If OK, go to following step.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 THROTTLE POSITION SENSOR
DTC Confirmation Procedure (Cont’d)
EC-177
SEF174Z
8)
Select “AUTO TRIG” in “DATA MONITOR” mode with CON-
SULT-II.
SEF178Y
9)
Maintain the following conditions for at least 10 consecutive
seconds.
ENG SPEED
More than 2,000 rpm
MAS A/F SE-B1
More than 3.2V
COOLAN TEMP/S
More than 70°C (158°F)
Selector lever
Suitable position
Driving location
Driving vehicle uphill (Increased engine load)
will help maintain the driving conditions
required for this test.
10) If 1st trip DTC is detected, go to “Diagnostic Procedure”,
DTC P0120 THROTTLE POSITION SENSOR
DTC Confirmation Procedure (Cont’d)
EC-178
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