Lexus ES300 (1997 year). Manual — part 322

FI6510

FI6607

A00113

KNK signal waveforms

0.5V

/Division

5 m sec./Division

100

µ

sec./Division

0V

200 mV

/Division

0V

–

DIAGNOSTICS

ENGINE

DI–65

217

1997 LEXUS ES300 (RM511U)

Reference INSPECTION USING OSCILLOSCOPE

With the engine racing (4,000 rpm) measure between ter-
minals KNKR, KNKL of ECM and body ground.

HINT: The correct waveform is as shown.

Spread the time on the horizontal axis, and confirm that
period of the wave is 141

µ

sec.

(Normal mode vibration frequency of knock sensor:
7.1 kHz)

HINT: If normal mode vibration frequency is not 7.1 kHz, the
sensor is malfunctioning.

P25474

Camshaft Position Sensor

Crankshaft Position Sensor

1

2

1

2

B–W

B–R

L

BR

E9

E9

E9

L

5

6

17

ECM

G22+

NE+

NE–

E2

DI–66

–

DIAGNOSTICS

ENGINE

218

1997 LEXUS ES300 (RM511U)

DTC

P0335

Crankshaft Position Sensor ”A” Circuit
Malfunction

CIRCUIT DESCRIPTION

Crankshaft position sensor (NE signal) consists of a signal plate and pickup coil.
The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34
signals for every engine revolution. The ECM detects the standard crankshaft angle based on the G22 sig-
nals, and the actual crankshaft angle and the engine speed by the NE signals.

DTC No.

DTC Detecting Condition

Trouble Area

P0335

No crankshaft position sensor signal to ECM during cranking

(2 trip detection logic)

Open or short in crankshaft position sensor circuit

Crankshaft position sensor

P0335

No crankshaft position sensor signal to ECM with engine

speed 600 rpm or more (2 trip detection logic)

Crankshaft osition sensor

Starter

ECM

WIRING DIAGRAM

DI09Q–01

FI7059

FI7060

A00069

G22, NE signal waveforms

G22

G22

NE

NE

5V

/Division

5V

/Division

20 m sec./Division (Idling)

10 m sec./Division (Idling)

–

DIAGNOSTICS

ENGINE

DI–67

219

1997 LEXUS ES300 (RM511U)

INSPECTION PROCEDURE

HINT:Perform troubleshooting of DTC P0335 first. If no trouble is found, troubleshoot the following mechani-
cal systems.

1

Check resistance of crankshaft position sensor (See page

IG–12

).

Reference INSPECTION USING OSCILLOSCOPE

During cranking or idling, check between terminals G22+ and
NE–, NE and NE– of ECM.
HINT:The correct waveforms are as shown.

NG

Replace crankshaft position sensor.

OK

2

Check for open and short in harness and connector between ECM and
crankshaft position sensor (See page

IN–27

).

NG

Repair or replace harness or connector.

OK

DI–68

–

DIAGNOSTICS

ENGINE

220

1997 LEXUS ES300 (RM511U)

3

Inspect sensor installation and teeth of crankshaft timing pulley.

NG

Tighten the sensor.
Replace crankshaft timing pulley.

OK

Check and replace ECM (See page

IN–27

).