TOYOTA CAMRY 1999 Service Repair Manual

± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±479
714 Author: Date:
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 ConditionTrouble 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
DI1KC±01

D01897
Combination Meter
Ignition Switch Except California, w/ Engine Immobilizer and / or TRAC:
R
2
L8
11
6 C8
13
165
R±B
L±W YIJ1
IG310
1H
1VECM
1
E7
B+ 4
II2 P1
II3D J/C J2910 C8
C8O
Y
R±BY
R 2L
E7
E7
E10 II2 P1
P1
P1D D
J/C J29 E
15
14
B±W A
GR3
6CL±W (*1, *3)
O (*2, *4) LL
2L
RL R±L
J27J28
J/C
10FE E Y
Y
L±W L±W6 5
8
R±BR±BR±B
5
P1 P12
AJ/C
J24
R±LA J27
C
B±W
B
BB
J/C J26
B±W
II2II22
R±L
J28J/C J28
F
J2811
II2
B±WBBJ/C J29NSW
R±L
B±W 1
1
GAUGE
1K 1J I16 I16
I16 I16
1J 1K3
4 Starter B±Y
R 4
8 2
7IG1
AM1
ST2
AM2 1B
2L 2AW
W±R 2
1K AM1
2 1 1
1B 1K5 5
GR (*4)
B±O (*5)
W±R
41
AM2
B
B B±R
B±R
B±R
1
2 F9
F9
ALT
11F4
F6
B±G
BatteryB
C
J8J7GR (*4)
B±O (*5)3
1
2535
2B
2D
2J
2K 11
12
ST
Relay
B±R
Starter
W±BAJ/C J11
IG
Left Kick
Panel Park/Neutral Position Switch
9
J/C CInstrument Panel J/B
Fusible
Link BlockEngine Room J/B No.2
MAIN 3
FL
Main
*1: w/ Engine Immobilizer System
*2: w/o Engine Immobilizer System
*3: TMC Made Ex. USA w/ TRAC
*4: TMMK Made, TMC Made USA w/ TRAC DI±480
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
715 Author: Date:
WIRING DIAGRAM

D01898
Combination Meter
Ignition Switch California, w/ Engine Immobilizer and / or TRAC:
R
2
L8
11
6 C8
13
165
R±B
L±W YIJ1
IG310
1H 1VECM
12
B+ 4
II2 P1
II3D J/C J29 C8
C8O
Y
R±BY
R 2 L
II2
P1
P1
P1D D
J/C J29 E
20
B±W A
GR3
6L±W (*1, *3)
O (*2, *4) LL
2L
RL R±L
J27J28
J/C
10FE E
Y Y
L±W L±W65
8
R±B
R±BR±B
5
P1P12
AJ/C
J24
R±LJ27
B±W
BB
II2II22
R±L
J28J/C J28
F
J28J/C J29NSW
R±L
B±W 1 1
GAUGE
1K1J
I16I16
I16 I16 1J1K3 4
Starter B±Y
R 4
8 2
7IG1
AM1
ST2
AM2 1B
2L 2AW
W±R 2
1K AM1
2 1 1
1B1K5 5
GR (*4)
B±O (*5)
W±R
41
AM2
B
B B±R
B±R
B±R
12
F9 F9
ALT
11
F4F6
B±G
FL
Main
BatteryF
J8
J7GR (*4)
B±O (*5)3
12535
2B
2D
2J2K 11
12
ST
Relay
B±R
Starter
W±BAJ/C J11
IG
Left Kick
Panel *1: w/ Engine Immobilizer System
*2: w/o Engine Immobilizer System
*3: TMC Made Ex. USA w/ TRAC
*4: TMMK Made, TMC Made USA w/ TRAC Park/Neutral Position SwitchE8
3
2
B±W B B
J/C J26II2 11
B±W
B
C9
J/C C
E8
E8E8
3C
CA
Engine Room J/B No.2
MAINInstrument Panel J/B
Instrument Panel J/B
Fusible
Link Block
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±481
716 Author: Date:

BE3840D00052D00836D01914
Except California, w/ Engine Immobilizer
and / or TRAC:
California, w/ Engine Immobilizer
and / or TRAC:ON
L
NSW
2
R
2R
L
NSW
Position
P, N
R
D
2
LNSW±Body
groundR±Body
ground2±Body
groundL±Body
ground
0 V
0 V0 V0 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 V9 ~ 14 V
9 ~ 14 V 9 ~ 14 V* DI±482
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
717 Author: Date:
INSPECTION PROCEDURE
1 Read PNP, REVERSE, 2ND and LOW signals.
When using TOYOTA hand±held tester.
PREPARATION:
(a) Remove the DLC3 cover.
(b) Connect a TOYOTA hand±held tester to the DLC3.
(c) Turn the ignition switch ON and TOYOTA hand±held tes-
ter 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 TOYOTA hand±held
tester.
OK:
Shift positionSignal
22ND OFF " ON
LLOW OFF " ON
RREVERSE OFF " ON
P, NNSW OFF " ON
When not using TOYOTA 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.

Q07657
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±483
718 Author: Date:
OK Proceed to next circuit inspection shown on
matrix chart (See page DI±453).
NG
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 PositionTerminal No. to continuity
P2 ± 75 ± 6
R2 ± 8±
N2 ± 95 ± 6
D2 ± 10±
22 ± 3±
L2 ± 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 IN±31).
NG Repair or replace the harness and connector.
OK
Check and replace the ECM.

D01899
Cruise Control ECU
14
ODY±B7B+
OD1ECM
C15
E10E7
*1: Except California, w/ Engine Immobilizer and / or TRAC
*2: California, w/ Engine Immobilizer and / or TRAC*2
*1
24 DI±484
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
719 Author: Date:
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
DI02S±02

BE3840Q07659
D00053
D00835D01915
Except California, w/ Engine Immobilizer
and / or TRAC:
California, w/ Engine Immobilizer
and / or TRAC:OD1
OD1 ON
(+) (±) (±)
(+)
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±485
720 Author: Date:
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 DI±453).
NG

AB0119
N19917
I00742
ON
O/D
(±)
(+)
DI±486
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
721 Author: Date:
2 Check voltage between terminal OD of cruise control ECU harness side connec-
tor and body ground.
PREPARATION:
(a) Disconnect the cruise control ECU connector.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal OD of cruise control ECU
harness side connector and body ground.
OK:
Voltage: 10 ~ 14 V
OK Check and replace the cruise control ECU.
NG
3 Check harness and connector between cruise control ECU and ECM.
NG Repair or replace the harness or connector.
OK
Check and replace the ECM.

D01900
ECM
4E7OD2B+
G±O
IG1 C
CC
O2 O/D Main
Switch O/D Indicator
Light
C8 712
R±L
D
Ignition Switch
11K2
1DGAUGE J/C J4
G±OG±O
IG3
J/C J6
G±O
O2
B±Y
AM11B 1K
C10
AM1
F9 D
R±L
I16 W 21
24
I16 2
12
B±R
B±R
B±R1
2
F9Fusible Link Block
FL Main
Battery 1
F4B±GW±B
A
J/C J5
IF A
W±B
Left Kick Panel
*1: Except California, w/ Engine Immobilizer and / or TRAC
*2: California, w/ Engine Immobilizer and / or TRACInstrument Panel J/B
Instrument Panel J/B11106 *2*1
ALTE8
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±487
722 Author: Date:
O/D Main Switch & O/D OFF Indictor Light Circuit
CIRCUIT DESCRIPTION
The O/D main switch contacts go open when the switch is pushed in and go closed when it is pushed out.
In O/D main switch at OFF position, the O/D OFF indicator light lights up, and the ECM prohibits shifting over-
drive.
WIRING DIAGRAM
DI1KD±01

Q07595
2
4
DI±488
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
723 Author: Date:
INSPECTION PROCEDURE
O/D OFF indicator light does not light up
1 Check O/D main switch.
PREPARATION:
Disconnect the O/D main switch connector.
CHECK:
Check continuity between terminals 2 and 4 of O/D main switch
connector.
OK:
O/D main switchResistance
ON8 W (open)
OFF0 W (continuity)
NG Replace the O/D main switch.
OK
2 Check and replace the combination meter (See page BE±2).
NG Replace the combination meter.
OK
3 Check OVRDRIVE CUT SW2 signal.
When using TOYOTA hand±held tester
PREPARATION:
(a) Connect a TOYOTA hand±held tester to the DLC3.
(b) Turn the ignition switch ON and TOYOTA hand±held tes-
ter main switch ON.
CHECK:
Read the OVRDRIVE CUT SW2 signal on the TOYOTA hand±
held tester.
OK:
O/D main switch conditionOVRDRIVE CUT SW2 signal
Pushed inOFF
Pushed outON