Infiniti G20 (P11). Manual — part 178
DTC Inspection Priority Chart
NCEC0039
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
P0340 Camshaft position sensor
I
P0403 EGR volume control valve
I
P0460, P0461, P0464, P1464 Fuel level sensor
I
P0500 Vehicle speed sensor
I
P0605 ECM
I
P1126 Thermostat function
I
P1605 A/T diagnosis communication line
I
P1706 Park/Neutral position (PNP) switch
2
I
P0105 Absolute pressure sensor
I
P0130-P0134 Heated oxygen sensor 1 (front)
I
P0135 Heated oxygen sensor 1 heater (front)
I
P0137-P0140 Heated oxygen sensor 2 (rear)
I
P0141 Heated oxygen sensor 2 heater (rear)
I
P0217 Coolant overtemperature enrichment protection
I
P0335, P1336 Crankshaft position sensor (OBD)
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-P0725, P0740-P1760 A/T related sensors, solenoid valves and switches
I
P1401 EGR temperature sensor
I
P1447 EVAP control system purge flow monitoring
I
P1490, P1491 Vacuum cut valve bypass valve
3
I
P0171, P0172 Fuel injection system function
I
P0300-P0304 Misfire
I
P0400, P1402 EGR function
I
P0420 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
P1148 Closed loop control
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
DTC Inspection Priority Chart
EC-123
Fail-safe Chart
=NCEC0040
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
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
P0403
EGR volume control valve
circuit
Engine speed will not rise more than 2,800 rpm due to the fuel cut.
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 condition 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
and IACV-AAC valve 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.
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Fail-safe Chart
EC-124
Symptom Matrix Chart
NCEC0041
SYSTEM — ENGINE CONTROL SYSTEM
NCEC0041S01
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
system
3
3
4
4
4
4
4
4
4
4
1
Incorrect idle speed adjustment
3
3
1
1
1
1
1
IACV-AAC valve circuit
1
1
2
3
3
2
2
2
2
2
2
Ignition
Incorrect ignition timing adjust-
ment
3
3
1
1
1
1
1
1
Ignition circuit
1
1
2
2
2
2
2
2
EGR
EGR volume control valve circuit
2
2
3
3
3
EGR system
2
1
2
3
3
3
2
2
3
3
Main power supply and ground circuit
2
2
3
3
3
3
3
2
3
2
Air conditioner circuit
2
2
3
3
3
3
3
3
3
3
2
HA section
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Matrix Chart
EC-125
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
Camshaft position sensor circuit
2
2
3
3
3
3
3
3
Mass air flow sensor circuit
1
1
2
2
2
2
2
2
Heated oxygen sensor 1 (front) circuit
1
2
3
2
2
2
2
Engine coolant temperature sensor circuit
1
1
2
3
2
3
2
2
3
2
Throttle position sensor circuit
1
2
2
2
2
2
2
2
Incorrect throttle position sensor adjust-
ment
3
1
1
1
1
1
1
1
Vehicle speed sensor circuit
2
3
3
3
Knock sensor circuit
2
3
ECM
2
2
3
3
3
3
3
3
3
3
3
Start signal circuit
2
PNP switch circuit
3
3
3
3
3
Power steering oil pressure switch circuit
2
3
3
Electrical load signal circuit
3
3
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Matrix Chart (Cont’d)
EC-126
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