Lexus ES300 (2002 year). Manual - part 332

C96267

ECM

NSW

E9

8

To
Engine Room R/B

B-Y

1H

1K

8

8

Engine Room J/B

B-Y

G-Y

6

9

A4
Park/Neutral Position SW

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-447

600

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

DTC

P1780

PARK/NEUTRAL POSITION SWITCH
MALFUNCTION

CIRCUIT DESCRIPTION

The park/neutral position switch detects the shift lever position and sends the signals to the ECM.

DTC No.

DTC Detection Condition

Trouble Area

P1780

When driving under conditions (a) and (b) for 30 sec. or more,
the park/neutral position switch is ON (P and N position).
(2 trip detection logic)

(a) Vehicle speed: 70 km/h (44 mph) or more

(b) Engine speed: 1,500 - 2,500 rpm

Park/neutral position switch circuit

Park/neutral position switch assy

ECM

WIRING DIAGRAM

056ES-01

C53270

05-448

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

601

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

INSPECTION PROCEDURE

1

READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER

(a)

Warm up the engine.

(b)

Turn the ignition switch OFF.

(c)

Connect the OBD II scan tool or Hand-held tester to the DLC3.

(d)

Turn the ignition switch ON and push the OBD II scan tool or Hand-held tester main SW ON.

(e)

Shift the shift lever to the P and N positions, select the item ”PNP SW (NSW)” in the DATALIST and
read its value displayed on the OBD II scan tool or Hand-held tester.

NOTICE:
The values given below for ”Normal Condition” are representative values, so a vehicle may still be
normal even if its value differs from those listed here. Do not depend solely on the ”Normal Condi-
tion” here when deciding whether or not the part is faulty.

Item

Measurement Item/

Display (Position)

Normal Condition

Diagnostic Note

PNP SW [NSW]

PNP SW Status/

ON or OFF

Shift lever position is;
P or N: ON
Except P or N: OFF

The shift lever position and these

values are different, there are fail-

ures of the PNP switch or shift

cable adjustment.

OK

CHECK AND REPLACE ECM(See page 

01-31

)

NG

2

INSPECT PARK/NEUTRAL POSITION SWITCH ASSY

(a)

Disconnect the park/neutral position switch connector.

(b)

Check continuity between each terminal shown below
when the shift lever is moved to each position.

Shift Position

Terminal No. to continuity

P

1 - 3

6 - 9

N

3 - 5

6 - 9

OK:
There is continuity.

NG

REPLACE PARK/NEUTRAL POSITION SWITCH
ASSY(See page 

40-3

)

OK

C96242

E1

NSW

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-449

602

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

3

CHECK HARNESS AND CONNECTOR(PARK/NEUTRAL POSITION SWITCH -
ECM)

(a)

Connect the park/neutral position switch connector.

(b)

Turn the IG switch ON and measure the voltage between
terminals NSW of ECM and the E1 when the shift lever is
shifted to the following position.
OK:

Shift Position

Terminal

Voltage (V)

P

NSW - E1

Below 1

N

NSW - E1

Below 1

Except P

 

and N

NSW - E1

10 - 14

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR(See page 

01-31

)

OK

CHECK AND REPLACE ECM(See page 

01-31

)

05-450

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

603

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

PARK/NEUTRAL POSITION SWITCH CIRCUIT

CIRCUIT DESCRIPTION

The park/neutral position switch detects the shift lever position and sends signals to the ECM.
The ECM receives signals (R, D, 4, 3, 2 and L) from the park/neutral position switch.

056ET-01