Infiniti I30 (A33). Manual — part 257

SEF254P

Component Description

NHEC0191

The crankshaft position sensor (POS) is located on the oil pan
facing the gear teeth (cogs) of the signal plate (flywheel). It detects
the crankshaft position signal (1° signal).
The sensor consists of a permanent magnet, core and coil.
When engine is running, the gap between the sensor and the gear
teeth (cogs) will periodically change. Permeability near the sensor
also changes.
Due to the permeability change, the magnetic flux near the core is
changed. Therefore, the voltage signal generated in the coil is
changed.
The ECM receives the voltage signal and detects the crankshaft
position signal (1° signal).

CONSULT-II Reference Value in Data Monitor
Mode

NHEC0492

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

CKPS·RPM (POS)

I

Tachometer: Connect

I

Run engine and compare tachometer indication with the CONSULT-II
value.

Almost the same speed as the
CONSULT-II value.

On Board Diagnosis Logic

NHEC0193

Malfunction is detected when 1° signal is not entered to ECM for
the first few seconds during engine cranking, or 1° signal is not
entered to ECM during engine running.

Possible Cause

NHEC0493

I

Harness or connectors
(The crankshaft position sensor (POS) circuit is open or
shorted.)

I

Crankshaft position sensor (POS)

I

Starter motor (Refer to EL section.)

I

Starting system circuit (Refer to EL section.)

I

Dead (Weak) battery

GI

MA

EM

LC

FE

AT

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

DTC P0335 CRANKSHAFT POSITION SENSOR (CKPS) (POS)

Component Description

EC-343

SEF058Y

DTC Confirmation Procedure

NHEC0194

NOTE:
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.

WITH CONSULT-II

NHEC0194S01

1)

Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.

2)

Crank engine for at least two seconds.

3)

If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-346.

WITH GST

NHEC0194S02

Follow the procedure “With CONSULT-II” above.

DTC P0335 CRANKSHAFT POSITION SENSOR (CKPS) (POS)

DTC Confirmation Procedure

EC-344

Wiring Diagram

NHEC0195

MEC812C

GI

MA

EM

LC

FE

AT

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

DTC P0335 CRANKSHAFT POSITION SENSOR (CKPS) (POS)

Wiring Diagram

EC-345

SEF856Y

Diagnostic Procedure

NHEC0196

1

RETIGHTEN GROUND SCREWS

1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.

SEF255X

©

GO TO 2.

DTC P0335 CRANKSHAFT POSITION SENSOR (CKPS) (POS)

Wiring Diagram (Cont’d)

EC-346