Lexus ES300 (2002 year). Service 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
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
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
)
OK
CHECK AND REPLACE ECM(See page
)
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
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