Nissan Primera P11. Instruction — part 131
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 MI illuminates.
DTC No.
Detected items
Engine operating condition in fail-safe mode
CON-
SULT-II
GST
ECM*1
P0100
0100
Mass air flow sensor
circuit
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0115
0115
Engine coolant tempera-
ture 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.
The radiator fan operates.
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
0120
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
Unable to
access
ECM
Unable to
access
Diagnostic
Test Mode
II
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 MI 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 limita-
tions.
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.
*: In Diagnostic Test Mode II (Self-diagnostic results)
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
QG16
I
18DE
Fail-safe Chart
EC-81
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)
*: If so equipped
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
QG16
I
18DE
Symptom Matrix Chart
EC-82
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
Crankshaft position sensor (POS) circuit
2
2
Camshaft position sensor (PHASE) circuit
3
2
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 or ABS
actuator and electric unit (control unit) cir-
cuit
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
QG16
I
18DE
Symptom Matrix Chart (Cont’d)
EC-83
SYSTEM — ENGINE MECHANICAL & OTHER
NCEC0041S03
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 tank
5
5
FE section
Fuel piping
5
5
5
5
5
5
—
Vapor lock
Valve deposit
5
5
5
5
5
5
5
Poor fuel (Heavy weight
gasoline, Low octane)
Air
Air duct
5
5
5
5
5
5
Air cleaner
Air leakage from air duct
(Mass air flow sensor — throttle
body)
5
5
5
5
Throttle body, Throttle wire
FE section
Air leakage from intake manifold/
Collector/Gasket
—
Cranking
Battery
1
1
1
1
1
1
1
1
EL section
Alternator circuit
Starter circuit
3
Flywheel
6
EM section
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
QG16
I
18DE
Symptom Matrix Chart (Cont’d)
EC-84
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