Infiniti QX4 (R50). Manual — part 162
31
PERFORM IDLE AIR VOLUME LEARNING
Refer to “Idle Air Volume Learning”, EC-57.
Which is the result CMPLT or INCMP?
CMPLT or INCMP
CMPLT
©
GO TO 32.
INCMP
©
1. Follow the construction of “Idle Air volume Learning”.
2. GO TO 31.
32
CHECK TARGET IDLE SPEED AGAIN
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “ENG SPEED” in “DATA MONITOR” mode with CONSULT-II.
3. Check idle speed.
750
±
50 rpm (in “P” or “N” position)
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.
750
±
50 rpm (in “P” or “N” position)
OK or NG
OK
©
GO TO 34.
NG
©
GO TO 33.
33
CHECK ECM FUNCTION
1. Substitute another known-good ECM to check ECM function.
(ECM may be the cause of a problem, but this is rarely the case.)
2. Perform initialization of NVIS (NATS) system and registration of NVIS (NATS) ignition key IDs. Refer to “NVIS (NISSAN
VEHICLE IMMOBILIZER SYSTEM — NATS)”, EC-74.
©
GO TO 31.
34
CHECK IGNITION TIMING AGAIN
Check ignition timing again. Refer to Test No. 30.
OK or NG
OK
©
GO TO 36.
NG
©
GO TO 35.
35
CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to EM-29, “Installation”.
OK or NG
OK
©
GO TO 33.
NG
©
1. Repair the timing chain installation.
2. GO TO 31.
36
ERASE UNNECESSARY DTC
After this inspection, unnecessary DTC No. might be displayed.
Erase the stored memory in ECM and TCM (Transmission control module).
Refer to “How to Erase Emission-Related Diagnostic Information”, EC-72 and AT-35, “HOW TO ERASE DTC”.
©
INSPECTION END
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Basic Inspection (Cont’d)
EC-115
DTC Inspection Priority Chart
NBEC0039
If some DTCs are displayed at the same time, perform inspections one by one based on the following prior-
ity chart.
Priority
Detected items (DTC)
1
I
P0100 Mass air flow sensor
I
P0110 Intake air temperature sensor
I
P0115 P0125 Engine coolant temperature sensor
I
P0120 Throttle position sensor
I
P0180 Fuel tank temperature sensor
I
P0325 Knock sensor
I
P0335 P1336 Crankshaft position sensor (POS)
I
P0340 Camshaft position sensor (PHASE)
I
P0460 P0461 P0464 P1464 Fuel level sensor
I
P0500 Vehicle speed sensor
I
P0605 ECM
I
P1320 Ignition signal
I
P1335 Crankshaft position sensor (REF)
I
P1605 A/T diagnosis communication line
I
P1706 Park/Neutral position (PNP) switch
2
I
P0105 Absolute pressure sensor
I
P0130-P0134, P0150-P0154 Heated oxygen sensor 1 (front)
I
P0135 P0155 Heated oxygen sensor 1 heater (front)
I
P0137-P0140, P0157-P0160 Heated oxygen sensor 2 (rear)
I
P0141 P0161 Heated oxygen sensor 2 (rear) heater
I
P0217 Coolant overtemperature enrichment protection
I
P0443 P1444 EVAP canister purge volume control solenoid valve
I
P0446 P1446 P1448 EVAP canister vent control valve
I
P0450 EVAP control system pressure sensor
I
P0510 Closed throttle position switch
I
P0705-P0755 P1705 P1760 A/T related sensors, solenoid valves and switches
I
P1111 Intake valve timing control solenoid valve
I
P1140 Intake valve timing control position sensor
I
P1165 Swirl control valve control vacuum check switch
I
P1441 EVAP control system (VERY SMALL LEAK)
I
P1447 EVAP control system purge flow monitoring
I
P1490 P1491 Vacuum cut valve bypass valve
3
I
P0171 P0172 P0174 P0175 Fuel injection system function
I
P0306 - P0300 Misfire
I
P0420 P0430 Three way catalyst function
I
P0440 P1440 EVAP control system (SMALL LEAK)
I
P0455 EVAP control system (GROSS LEAK)
I
P0505 IACV-AAC valve
I
P0600 A/T communication line
I
P0731-P0734 P0744 A/T function
I
P1110 Intake valve timing control
I
P1130 Swirl control valve control solenoid valve
I
P1148 P1168 Closed loop control
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
DTC Inspection Priority Chart
EC-116
Fail-safe Chart
=NBEC0040
The ECM enters fail-safe mode, if any of the following malfunctions is detected due to the open or short cir-
cuit. When the ECM enters the fail-safe mode, the MIL illuminates.
DTC No.
Detected items
Engine operating condition in fail-safe mode
P0100
Mass air flow sensor circuit
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0115
Engine coolant temperature
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)
P0120
Throttle position sensor cir-
cuit
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
P1335
Crankshaft position sensor
(REF) circuit
Compression TDC signal (120° signal) is controlled by camshaft position sensor
(PHASE) signal and crankshaft position sensor (POS) signal. Ignition timing will be
delayed 0° to 2°.
Unable to
access ECM
ECM
ECM fail-safe activating condition
The computing function of the ECM was judged to be malfunctioning.
When the fail-safe system activates (i.e., if the ECM detects a malfunction condi-
tion in the CPU of ECM), the MIL on the instrument panel lights to warn the driver.
However it is not possible to access ECM and DTC cannot be confirmed.
Engine control with fail-safe
When ECM fail-safe is operating, fuel injection, ignition timing, fuel pump operation,
IACV-AAC valve operation and cooling fan operation are controlled under certain
limitations.
ECM fail-safe operation
Engine speed
Engine speed will not rise more than 3,000
rpm
Fuel injection
Simultaneous multiport fuel injection system
Ignition timing
Ignition timing is fixed at the preset valve
Fuel pump
Fuel pump relay is “ON” when engine is running
and “OFF” when engine stalls
IACV-AAC valve
Full open
Replace ECM, if ECM fail-safe condition is confirmed.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Fail-safe Chart
EC-117
Symptom Matrix Chart
NBEC0041
SYSTEM — BASIC ENGINE CONTROL SYSTEM
NBEC0041S01
SYMPTOM
Reference
page
HARD/NO
ST
AR
T/REST
AR
T
(EXCP
.
HA)
ENGINE
ST
ALL
HESIT
A
TION/SURGING/FLA
T
SPOT
SP
ARK
KNOCK/DET
ONA
TION
LACK
OF
POWER/POOR
ACCELERA
TION
HIGH
IDLE/LOW
IDLE
ROUGH
IDLE/HUNTING
IDLING
VIBRA
TION
SLOW/NO
RETURN
T
O
IDLE
OVERHEA
TS/W
A
TER
TEMPERA
TURE
HIGH
EXCESSIVE
FUEL
CONSUMPTION
EXCESSIVE
OIL
CONSUMPTION
BA
TTER
Y
DEAD
(UNDER
CHARGE)
Warranty symptom code
AA AB AC AD AE AF AG
AH
AJ
AK AL AM HA
Fuel
Fuel pump circuit
1
1
2
3
2
2
2
3
2
Fuel pressure regulator system
3
3
4
4
4
4
4
4
4
4
Injector circuit
1
1
2
3
2
2
2
2
Evaporative emission system
3
3
4
4
4
4
4
4
4
4
Air
Positive crankcase ventilation sys-
tem
1
Incorrect idle speed adjustment
1
1
1
1
1
IACV-AAC valve circuit
1
1
2
3
3
2
2
2
2
2
2
Ignition
Incorrect ignition timing adjustment
3
3
1
1
1
1
1
1
Ignition circuit
1
1
2
2
2
2
2
2
Main power supply and ground circuit
2
2
3
3
3
3
3
2
3
Air conditioner circuit
3
3
2
HA section
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Matrix Chart
EC-118
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