Lexus ES300 (1997 year). Service manual — part 352
D00107
C8
C8
C8
II2
ID4
ID4
ID1
Combination Meter
ECM
Ignition Switch
Battery
Starter
Security ECU
E7
E7
E7
L
2
R
B+
NSW
14
J29
B
B
B–W
R–B
R–B
J27
J28
J27
Y
O
R–B
IG3
16
13
J29
D
D
D
1
10
15
L–W
Y
J29
E
E
E
Y
Y
4
3
8
5
6
2
Park/Neutral
Position Switch
J24
1H
1V
10
5
5
6
3
11
10
2
J8
J7
C
B
*1
*1
2J
2B
2D
2K
IG2
IF
F9
F9
F4
F6
AL
T
4
2
W
1K
1K
1B
1J
AM1
GAUGE
R–L
R–B
R–B
1
J28
1
R–L
R–L
R–L
A
A
1
S
T
Relay
1
2
1
1
G–B
FL
MAIN
*1: TMC Production
→
GR, TMM Procuction
→
B–O
B
1
2
3
11
5
9
1
2
3
5
L
R
2
6
11
8
C
A
C
R–B
O
Y
F
F
J26
II2
II2
B–W
B–W
B–W
B
B
R–B
IG3
E10
Instrument
Panel J/B
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–185
337
1997 LEXUS ES300 (RM511U)
DTC
P1780
Park/Neutral Position Switch Malfunction
CIRCUIT DESCRIPTION
The park/neutral position switch detects the shift lever position and sends signals to the ECM.
The ECM receives signals (NSW, R, 2 and L) from the park/neutral position switch. When the signal is not
sent to the ECM from the park/neutral position switch, the ECM judges that the shift lever is in D position.
DTC No.
DTC Detection Condition
Trouble Area
P1780
When driving under conditions (a) and (b) for 30 seconds or
more, the park/neutral position switch is ON (N position).
(2 trip detection logic)
(a) Vehicle speed: 70 km/h (44 mph) or more
(b) Engine speed: 1,500
∼
2,500 rpm
Short in park/neutral position switch circuit
Park/neutral position switch
ECM
WIRING DIAGRAM
DI0CZ–01
BE3840
D00052
D00042
ON
NSW
L
2
R
Position
P,N
R
D
2
L
NSW–Body
ground
R–Body
ground
2–Body
ground
L–Body
ground
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
9
∼
14 V*
9
∼
14 V
9
∼
14 V
9
∼
14 V
9
∼
14 V
9
∼
14 V
9
∼
14 V*
DI–186
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
338
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Read PNP, REVERSE, 2ND and LOW signals.
When using LEXUS hand–held tester.
PREPARATION:
(a)
Remove the DLC3 cover.
(b)
Connect a LEXUS hand–held tester to the DLC3.
(c)
Turn the ignition switch ON and LEXUS hand–held tester
main switch ON.
CHECK:
Shift lever into the P, R, N, 2 and L positions, and read the PNP,
REVERSE, 2ND and LOW signals on the LEXUS hand–held
tester.
OK:
Shift position
Signal
2
2ND OFF
→
ON
L
LOW OFF
→
ON
R
REVERSE OFF
→
ON
P,N
NSW OFF
→
ON
When not using LEXUS hand–held tester.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure voltage between terminals NSW, 2, L and R of ECM
and body ground when the shift lever is shifted to the following
positions.
OK:
HINT: The voltage will drop slightly due to lighting up of the back
up light.
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
Q07657
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–187
339
1997 LEXUS ES300 (RM511U)
2
Check park/neutral position switch.
PREPARATION:
(a)
Jack up the vehicle.
(b)
Remove the park/neutral position switch.
CHECK:
Check continuity between each terminal shown below when the
shift lever is moved to each position.
Shift Position
Terminal No. to continuity
P
2 – 7
5 – 6
R
2 – 8
–
N
2 – 9
5 – 6
D
2 – 10
–
2
2 – 3
–
L
2 – 4
–
OK:
There is continuity.
NG
Replace the park/neutral position switch.
OK
3
Check harness and connector between battery and park/neutral position switch,
park/neutral position switch and ECM (See page
).
NG
Repair or replace the harness and connector.
OK
Check and replace the ECM.
Q00758
Cruise Control ECU
14
OD
Y–B
7
B+
OD1
ECM
C15
E7
D00053
ON
OD1
(+)
(–)
DI–188
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
340
1997 LEXUS ES300 (RM511U)
O/D Cancel Signal Circuit
CIRCUIT DESCRIPTION
While driving uphill with cruise control activated, in order to minimize gear shifting and provide smooth cruis-
ing overdrive may be prohibited temporarily under some condition.
The cruise control ECU sends O/D cut signals to the ECM as necessary and the ECM cancels overdrive
shifting until these signals are discontinued.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check voltage between terminal OD1 of ECM and body ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure voltage between terminal OD1 of ECM and body
ground.
OK:
Voltage: 10
∼
14 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
DI0D0–01
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