Infiniti I35 (A33). Manual — part 196
DTC Inspection Priority Chart
NHEC0039
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
U1000, U1001 CAN communication line
I
P0101, P0102, P0103, P1102 MAF sensor
I
P0112, P0113, P0127 IAT sensor
I
P0117, P0118, P0125 ECT sensor
I
P0122, P0123, P0222, P0223, P1225, P1226, P2135 Throttle position sensor
I
P0128 Thermostat function
I
P0181, P0182, P0183 FTT sensor
I
P0327, P0328 KS
I
P0335 CKP sensor (POS)
I
P0340, P0345 CMP sensor (PHASE)
I
P0460, P0461, P0462, P0463, P1464 Fuel level sensor
I
P0500 VSS
I
P0605 ECM
I
P0705 Park/Neutral position switch
I
P1229 Sensor power supply
I
P1706 PNP switch
I
P2122, P2123, P2127, P2128, P2138 Accelerator pedal position sensor
2
I
P0031, P0032, P0051, P0052 HO2S1 heater
I
P0037, P0038, P0057, P0058 HO2S2 heater
I
P0107, P0108 Absolute pressure sensor
I
P0132-P0134, P1143, P1144 and P0152-P0154, P1163, P1164 HO2S1
I
P0138, P0139, P1146, P1147 and P0158, P0159, P1166, P1167 HO2S2
I
P0441 EVAP control system purge flow monitoring
I
P0444, P0445, P1444 EVAP canister purge volume control solenoid valve
I
P0447, P1446, P1448 EVAP canister vent control valve
I
P0452, P0453 EVAP control system pressure sensor
I
P0550 Power steering pressure sensor
I
P0650 MIL
I
P0710, P0720, P0725, P0740, P0745, P0750, P1705, P1760 A/T related sensors, solenoid valves and
switches
I
P1065 ECM power supply
I
P1122 Electric throttle control function
I
P1217 Engine overtemperature (OVERHEAT)
I
P1490, P1491 Vacuum cut valve bypass valve
I
P1800 VIAS control solenoid valve
I
P1805 Brake switch
3
I
P0011, P0021 Intake valve timing control
I
P0171, P0172 and P0174, P0175 Fuel injection system function
I
P0300-P0306 Misfire
I
P0420, P0430 Three way catalyst function
I
P0442, P0456, P1456 EVAP control system (SMALL LEAK, VERY SMALL LEAK)
I
P0455 EVAP control system (GROSS LEAK)
I
P0506, P0507 ISC system
I
P0731-P0734, P0744 A/T function
I
P1121 Electric throttle control actuator
I
P1124, P1126 Throttle control motor relay
I
P1128 Throttle control motor
I
P1148, P1168 Closed loop control
I
P1211 ABS/TCS control unit
I
P1212 ABS/TCS communication line
I
P1564 ASCD steering switch
I
P1572 ASCD brake switch
I
P1574 ASCD Vehicle speed sensor
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
DTC Inspection Priority Chart
EC-125
Fail-safe Chart
=NHEC1425
When the DTC listed below is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC No.
Detected items
Engine operating condition in fail-safe mode
P0102
P0103
P1102
Mass air flow sensor circuit
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117
P0118
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)
When the fail-safe system for engine coolant temperature sensor is activated, the
cooling fan operates while engine is running.
P0122
P0123
P0222
P0223
P2135
Throttle position sensor
The ECM controls the electric throttle control actuator in regulating the throttle
opening in order for the idle position to be within +10 degrees.
The ECM regulates an opening speed of approx. 5 seconds to an opening of 10
degrees. So, the acceleration will be poor.
P1121
Electric throttle control
actuator
(When electric throttle control actuator does not function properly due to the return
spring malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around
the idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening
to 20 degrees or less.
(When ECM detects the throttle valve is stuck open:)
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle
stops, the engine stalls.
The engine can restart in N or P position, and engine speed will not exceed 1,000
rpm or more.
P1122
Electric throttle control func-
tion
ECM stops the electric throttle control actuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by the return spring.
P1124
P1126
Throttle control relay
ECM stops the electric throttle control actuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by the return spring.
P1128
Throttle control motor
ECM stops the electric throttle control actuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by the return spring.
P1129
Sensor power supply
ECM stops the electric throttle control actuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by the return spring.
P2122
P2123
P2127
P2128
P2138
Accelerator pedal position
sensor
The ECM controls the electric throttle control actuator in regulating the throttle
opening in order for the idle position to be within +10 degrees.
The ECM regulates an opening speed of approx. 5 seconds to an opening of 10
degrees. So, the acceleration will be poor.
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Fail-safe Chart
EC-126
Symptom Matrix Chart
=NHEC0041
SYSTEM — BASIC ENGINE CONTROL SYSTEM
NHEC0041S01
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
Electric throttle control actuator
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
VDC/TCS/ABS control unit
4
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Matrix Chart
EC-127
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
Engine
control
Crankshaft position sensor (POS)
circuit
2
2
Camshaft position sensor
(PHASE) circuit
3
2
Mass air flow sensor circuit
1
1
2
2
2
2
2
2
Heated oxygen sensor 1 circuit
3
Engine coolant temperature sen-
sor circuit
1
3
3
Throttle position sensor circuit
2
2
Accelerator pedal position sensor
circuit
3
1
1
1
1
1
Vehicle speed sensor circuit
2
3
3
3
Knock sensor circuit
2
ECM
2
2
3
3
3
3
3
3
3
3
Start signal circuit
2
Park/Neutral position switch circuit
3
3
3
3
3
Power steering pressure sensor
circuit
2
Electrical load signal circuit
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Matrix Chart (Cont’d)
EC-128
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