Infiniti QX4 (R50). Manual — part 295
8
CHECK HEADLAMP INPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect headlamp LH relay.
4. Check harness continuity between ECM terminal 52 and headlamp LH relay terminal 7 under the following conditions.
SEF031Z
5. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 10.
NG
©
GO TO 9.
9
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors E1, M1
I
Harness connectors M33, F22
I
Diode E121
I
Harness for open and short between ECM and headlamp LH relay or daytime light control unit
©
Repair open circuit or short to ground or short to power in harness or connectors.
10
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
©
INSPECTION END
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ELECTRICAL LOAD SIGNAL
Diagnostic Procedure (Cont’d)
EC-647
Wiring Diagram
NBEC0407
MEC978C
MIL & DATA LINK CONNECTORS
Wiring Diagram
EC-648
Fuel Pressure Regulator
NBEC0408
Fuel pressure at idling kPa (kg/cm
2
, psi)
Vacuum hose is connected.
Approximately 235 (2.4, 34)
Vacuum hose is disconnected.
Approximately 294 (3.0, 43)
Idle Speed and Ignition Timing
NBEC0409
Target idle speed*1
No-load*2 (in “P” or N” position)
750
±
50 rpm
Air conditioner: ON
In “P” or N” position
825 rpm or more
Ignition timing*1
In “P” or N” position
15°
±
5° BTDC
Throttle position sensor idle position
0.15 - 0.85V
*1: Throttle position sensor harness connector connected
*2: Under the following conditions:
I
Air conditioner switch: OFF
I
Electric load: OFF (Lights, heater fan & rear window defogger)
I
Steering wheel: Kept in straight-ahead position
Mass Air Flow Sensor
NBEC0411
Supply voltage
Battery voltage (11 - 14)V
Output voltage at idle
1.2 - 1.8*V
Mass air flow (Using CONSULT-II or GST)
2.0 - 6.0
g·m/sec at idle*
7.0 - 20.0
g·m/sec at 2,500 rpm*
*: Engine is warmed up to normal operating temperature and running under no-load.
Engine Coolant Temperature Sensor
NBEC0412
Temperature °C (°F)
Resistance k
Ω
20 (68)
2.1 - 2.9
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
Heated Oxygen Sensor 1 Heater (Front)
NBEC0414
Resistance [at 25°C (77°F)]
2.3 - 4.3
Ω
Fuel Pump
NBEC0415
Resistance [at 25°C (77°F)]
0.2 - 5.0
Ω
IACV-AAC Valve
NBEC0416
Resistance [at 20°C (68°F)]
Approximately 20 - 24
Ω
Injector
NBEC0417
Resistance [at 20°C (68°F)]
13.5 - 17.5
Ω
Resistor
NBEC0418
Resistance [at 25°C (77°F)]
Approximately 2.2 k
Ω
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SERVICE DATA AND SPECIFICATIONS (SDS)
Fuel Pressure Regulator
EC-649
Throttle Position Sensor
NBEC0419
Throttle valve conditions
Voltage
(at normal operating temperature,
engine off, ignition switch ON,
throttle opener disengaged)
Completely closed (a)
0.15 - 0.85V
Partially open
Between (a) and (b)
Completely open (b)
3.5 - 4.7V
Calculated Load Value
NBEC0420
Calculated load value % (Using CONSULT-II or GST)
At idle
14.0 - 33.0
At 2,500 rpm
12.0 - 25.0
Intake Air Temperature Sensor
NBEC0421
Temperature °C (°F)
Resistance k
Ω
20 (68)
2.1 - 2.9
80 (176)
0.27 - 0.38
Heated Oxygen Sensor 2 Heater (Rear)
NBEC0422
Resistance [at 25°C (77°F)]
2.3 - 4.3
Ω
Crankshaft Position Sensor (REF)
NBEC0423
Resistance [at 20°C (68°F)]
470 - 570
Ω
Fuel Tank Temperature Sensor
NBEC0424
Temperature °C (°F)
Resistance k
Ω
20 (68)
2.3 - 2.7
50 (122)
0.79 - 0.90
Camshaft Position Sensor (PHASE)
NBEC0639
Resistance [at 20°C (68°F)]
HITACHI make
1,440 - 1,760
Ω
MITSUBISHI make
2,090 - 2,550
Ω
SERVICE DATA AND SPECIFICATIONS (SDS)
Throttle Position Sensor
EC-650
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