Infiniti I30 (A33). Manual — part 201
22
CHECK IGNITION TIMING
1. Start engine and warm it up to normal operating temperature.
2. Check ignition timing at idle using a timing light.
SEF572X
Ignition timing:
15°
±
5° BTDC (in “P” or “N” position)
OK or NG
OK
©
GO TO 30.
NG
©
GO TO 23.
23
CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to EM-29, “Installation”.
OK or NG
OK
©
GO TO 21.
NG
©
1. Repair the timing chain installation.
2. GO TO 16.
24
CHECK IGNITION TIMING
1. Start engine and let it idle.
2. Check ignition timing at idle using a timing light.
SEF572X
Ignition timing:
15°
±
5° BTDC (in “P” or “N” position)
OK or NG
OK
©
GO TO 30.
NG
©
GO TO 25.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Basic Inspection (Cont’d)
EC-119
25
PERFORM IDLE AIR VOLUME LEARNING
Refer to “Idle Air Volume Learning”, EC-66.
Which is the result CMPLT or INCMP?
CMPLT or INCMP
CMPLT
©
GO TO 26.
INCMP
©
1. Follow the construction of “Idle Air volume Learning”.
2. GO TO 25.
26
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.
700
±
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.
700
±
50 rpm (in “P” or “N” position)
OK or NG
OK
©
GO TO 28.
NG
©
GO TO 27.
27
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 IVIS (NATS) system and registration of IVIS (NATS) ignition key IDs. Refer to “IVIS (INFINITI
VEHICLE IMMOBILIZER SYSTEM — NATS)”, EC-82.
©
GO TO 25.
28
CHECK IGNITION TIMING AGAIN
Check ignition timing again. Refer to Test No. 24.
OK or NG
OK
©
GO TO 30.
NG
©
GO TO 29.
29
CHECK TIMING CHAIN INSTALLATION
Check timing chain installation. Refer to EM-29, “Installation”.
OK or NG
OK
©
GO TO 27.
NG
©
1. Repair the timing chain installation.
2. GO TO 25.
30
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-80 and AT-38, “HOW TO ERASE
DTC”.
©
INSPECTION END
TROUBLE DIAGNOSIS — BASIC INSPECTION
Basic Inspection (Cont’d)
EC-120
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
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
P1126 Thermostat function
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 heater (rear)
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
P1165 Swirl control valve control vacuum check switch
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
P1130 Swirl control valve control solenoid valve
I
P1148 P1168 Closed loop control
GI
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IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
DTC Inspection Priority Chart
EC-121
Fail-safe Chart
=NHEC0040
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 cir-
cuit
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0115
Engine coolant tempera-
ture sensor circuit
Engine coolant temperature will be determined by ECM based on the time after turn-
ing 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
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 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,
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
Cooling fans
Cooling fan relay “ON” (High speed condition)
when engine is running, and “OFF” when engine
stalls.
Replace ECM, if ECM fail-safe condition is confirmed.
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Fail-safe Chart
EC-122
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