Infiniti QX4 (R50). Manual — part 261
On Board Diagnosis Logic
NBEC0576
Malfunction is detected when
(Malfunction A) 120° signal is not entered to ECM for the first few
seconds during engine cranking,
(Malfunction B) 120° signal is not entered to ECM during engine
running,
(Malfunction C) 120° signal cycle excessively changes during
engine running.
FAIL-SAFE MODE
NBEC0576S01
When the ECM enters the fail-safe mode, the MIL illuminates.
Detected items
Engine operating condition in fail-safe mode
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°.
Possible Cause
NBEC0577
I
Harness or connectors
(The crankshaft position sensor (REF) circuit is open or
shorted.)
I
Crankshaft position sensor (REF)
I
Starter motor (Refer to SC section.)
I
Starting system circuit (Refer to SC section.)
I
Dead (Weak) battery
DTC Confirmation Procedure
NBEC0578
NOTE:
I
Perform “PROCEDURE FOR MALFUNCTION A” first. If 1st
trip DTC cannot be confirmed, perform “PROCEDURE
FOR MALFUNCTION B AND C”.
I
If
“DTC
Confirmation
Procedure”
has
been
previously
conducted, always turn ignition switch “OFF” and wait at least
10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is more than 10.5V at idle.
SEF013Y
PROCEDURE FOR MALFUNCTION A
NBEC0578S01
With CONSULT-II
NBEC0578S0101
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Crank engine for at least 2 seconds.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-514.
With GST
NBEC0578S0102
Follow the procedure “With CONSULT-II” above.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1335 CRANKSHAFT POSITION SENSOR (CKPS) (REF)
On Board Diagnosis Logic
EC-511
SEF058Y
PROCEDURE FOR MALFUNCTION B AND C
NBEC0578S02
With CONSULT-II
NBEC0578S0201
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Start engine and run it for at least 2 seconds at idle speed.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-514.
With GST
NBEC0578S0202
Follow the procedure “With CONSULT-II” above.
DTC P1335 CRANKSHAFT POSITION SENSOR (CKPS) (REF)
DTC Confirmation Procedure (Cont’d)
EC-512
Wiring Diagram
NBEC0579
MEC960C
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1335 CRANKSHAFT POSITION SENSOR (CKPS) (REF)
Wiring Diagram
EC-513
Diagnostic Procedure
NBEC0580
1
RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
SEF959Y
©
GO TO 2.
2
CHECK CKPS (REF) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect CKPS (REF) harness connector.
SEF011Z
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 65, 75 and CKPS (REF) terminal 2. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
3
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors E132, E135
I
Harness connectors E116, M114 and M32, F23
I
Harness for open or short between crankshaft position sensor (REF) and ECM
©
Repair open circuit or short to ground or short to power in harness or connectors.
DTC P1335 CRANKSHAFT POSITION SENSOR (CKPS) (REF)
Diagnostic Procedure
EC-514
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