TOYOTA CAMRY 1999 Service Repair Manual

Q07745
Drain
Drain Line
Pressure
Q07746
± DIAGNOSTICSAUTOMATIC TRANSAXLE
DI±159
DTC P0770 Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)
SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor, air±
flow meter and crankshaft position sensor to monitor the en-
gagement condition of the lock±up clutch.
Then the ECM compares the engagement condition of the
lock±up clutch with the lock±up schedule in the ECM memory
to detect mechanical trouble of the shift solenoid valve SL,
valve body, torque converter clutch or automatic transaxle
(clutch, brake or gear etc.).
DTC No.DTC Detecting ConditionTrouble Area
P0770

Lock±up does not occur when driving in the lock±up range
(normal driving at 80 km/h [50 mph]), or lock±up remains ON
in the lock±up OFF range.
(2 trip detection logic)

When lock±up is ON, clutch or brake slips or gear is broken.
Shift solenoid valve SL is stuck open or closed

Valve body blocked up or stuck

Lock±up clutch

Automatic transaxle (clutch, brake or gear etc.)
INSPECTION PROCEDURE
1 Check solenoid valve SL operation.
PREPARATION:
(a) Remove the oil pan.
(b) Remove the shift solenoid valve SL.
CHECK:
(a) By applying 490 kPa (5 kgf/cm2, 71 psi) of compressed
air, check that the solenoid valve does not leak air.
(b) When battery positive voltage is supplied to the shift sole-
noid valve, check that the solenoid valve opens.
OK:
(a) Solenoid valve does not leak air.
(b) Solenoid valve opens.
NG Replace the solenoid valve SL.
OK
DI034±05

DI±160
± DIAGNOSTICSAUTOMATIC TRANSAXLE
2 Check valve body (See page DI±148).
NG Repair or replace the valve body.
OK
3 Check the torque converter clutch (See Pub. No. RM654U on page AX±26).
NG Replace the torque converter clutch.
OK
Repair or replace the transaxle.

D02260
1 Shift Solenoid
Valve SLECM Transaxle
E1P8
E6SL
± DIAGNOSTICSAUTOMATIC TRANSAXLE
DI±161
DTC P0773 Shift Solenoid E Electrical Malfunction
(Shift Solenoid Valve SL)
CIRCUIT DESCRIPTION
The shift solenoid valve SL is turned ON and OFF by signals from the ECM to control the hydraulic pressure
acting on the lock±up relay valve, which then controls operation of the lock±up clutch.
Fail safe function
If the ECM detects a malfunction, it turns the shift solenoid valve SL OFF.
DTC No.DTC Detecting ConditionTrouble Area
P0773
Either (a) or (b) is detected for 1 time.(2 trip detection logic)
(a) Solenoid resistance is 8 W or less short circuit when sole-
noid is energized.
(b) Solenoid resistance is 100 kW or more open circuit when
solenoid is not energized.

Open or short in shift solenoid valve SL circuit

Shift solenoid valve SL

ECM
WIRING DIAGRAM
DI035±05

D05155
SL
D05154
SL
SL
1
2
DI±162
± DIAGNOSTICSAUTOMATIC TRANSAXLE
INSPECTION PROCEDURE
1 Measure resistance between terminal SL of ECM and body ground.
PREPARATION:
Disconnect the connector from ECM.
CHECK:
Measure resistance between terminal SL of ECM and body
ground.
OK:
Resistance: 11 ± 15 W
OK Check and replace the ECM.
NG
2 Check harness and connector between ECM and automatic transaxle solenoid
connector.
PREPARATION:
Disconnect the solenoid connector from the transaxle.
CHECK:
Check the harness and connector between terminal SL of ECM
and terminal SL of solenoid connector.
OK:
There is no open or short circuit.
NG Repair or replace the harness or connector.
OK

Q07749
± DIAGNOSTICSAUTOMATIC TRANSAXLE
DI±163
3 Check shift solenoid valve SL.
PREPARATION:
(a) Jack up the vehicle.
(b) Remove the oil pan.
(c) Disconnect the shift solenoid valve SL connector.
(d) Remove the shift solenoid valve SL.
CHECK:
(a) Measure resistance between terminal SL of shift solenoid
valve and solenoid body.
(b) Connect positive
lead to terminal of solenoid connec-
tor, negative  lead to solenoid body.
OK:
(a) Resistance: 11 ± 15 W
(b) The shift solenoid valve SL makes operation
noise.
NG Replace the shift solenoid valve SL.
OK
Check and replace or repair the solenoid
wire.

DI±164
± DIAGNOSTICSAUTOMATIC TRANSAXLE
DTC P1520 Stop Light Switch Signal Malfunction
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling, while driving in lock±up condition, when
brakes are suddenly applied.
When the brake pedal is depressed, this switch sends a signal to ECM. Then the ECM cancels operation
of the lock±up clutch while braking is in progress.
DTC No.DTC Detecting ConditionTrouble Area
P1520No stop light switch signal to ECM during driving.
(2 trip detection logic)
Open or short in stop light switch circuit

Stop light switch

ECM
WIRING DIAGRAM
See page DI±108.
INSPECTION PROCEDURE
See page DI±108.
DI036±05

± DIAGNOSTICSAUTOMATIC TRANSAXLE
DI±165
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: 80 km/h (50 mph) or more
(b) Engine speed: 2,000 ± 5,000 rpm

Short in park/neutral position switch circuit

Park/neutral position switch

ECM
DI037±05

D06504
Combination
Meter
R
C10
2
L8
11
6 C10
C10R±B
13
O
Y16IF1
IF1L±W
YInstrument
Panel J/BECM
1H
1V10
5
19
18
17
6 E4
E4
E4
E7R2 L
B
+
NSW Y
L±W
R±B A
J23J27
J24 CC R±B Park/Neutral
Position Switch
P1
8 3 4
P1
P1Y5
6
5
P1L±W
R±BJ22
Junction
Connector
EEE
J22 Junction
ConnectorD
D D
R±B 3
IG3
B±W
B±W B±W
B±W Junction
Connector
B
BB
J22
Junction
Connector 11
IG2 P12
P16
N RB
P RL2L LL
GR J19
Junction
Connector
D
DR±L
R±L 2R±L
IG2
F
F
J24 Junction
ConnectorR±L
1
1
1K 1JGAUGE
B±Y 24
I10 Ignition Switch
I10
I10 I107
8
R43
1K
1J STARTER Instrument Panel J/B
Instrument Panel J/B W
W±R AM1
1B
2L12
55 1B
1K 1K
2A 41
AM2 W±R
Instrument Panel J/B Instrument Panel J/B
Engine Room J/B No.2 12 F14 F14
ALT
11F9 F11B±RB±R
B±G
FL
MAIN
BatteryB
J7 J8 Junction Connector
10
GRCB
IG2J7 J6GR B
ST Relay
2B3
115
9
2J2D
2K 53
12 Engine Room J/B No.2
J9 Junction ConnectorStarter
A
IF MAIN IG2 IG2 DI±166
± DIAGNOSTICSAUTOMATIC TRANSAXLE
WIRING DIAGRAM

D06387
(+)NSW
(±)2R
L
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 V 9 ± 14 V*
9 ± 14 V
9 ± 14 V
± DIAGNOSTICSAUTOMATIC TRANSAXLE
DI±167
INSPECTION PROCEDURE
1 Read PNP, REVERSE, 2ND and LOW signals.
When using hand±held tester:
PREPARATION:
(a) Remove the DLC3 cover.
(b) Connect a hand±held tester to the DLC3.
(c) Turn the ignition switch to ON and hand±held tester main
switch ON.
CHECK:
Shift the shift lever into the P, R, N, 2 and L positions, and read
the PNP, REVERSE, 2ND and LOW signals on the hand±held
tester.
OK:
Shift positionSignal
22ND OFF " ON
LLOW OFF " ON
RREVERSE OFF " ON
P, NPNP OFF " ON
When not using hand±held tester:
PREPARATION:
Turn the ignition switch to ON.
CHECK:
Measure voltage between terminals NSW, 2, L and R of ECM
and body ground when the shift lever is shifted in 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 DI±148).
NG

Q07657
DI±168
± DIAGNOSTICSAUTOMATIC TRANSAXLE
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 continuityTerminal No. to continuity
P4 ± 75 ± 6
R4 ± 8±
N4 ± 105 ± 6
D4 ± 9±
22 ± 4±
L2 ± 3±
OK:
Continuity exists.
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±29).
NG Repair or replace the harness and connector.
OK
Check and replace the ECM.