TOYOTA CAMRY 1999 Service Repair Manual

Q07648D00839D01911
Except California, w/ Engine Immobilizer
and / or TRAC:
California, w/ Engine Immobilizer
and / or TRAC:SL
SL
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±469
704 Author: Date:
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: 8 ~ 100,000 W
OK Check and replace the ECM.
NG

Q07938D00840D01912
SL
SL
SL
SL Except California, w/ Engine Immobilizer
and / or TRAC:
California, w/ Engine Immobilizer
and / or TRAC:
DI±470
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
705 Author: Date:
2 Check harness and connector between ECM and automatic transaxle solenoid
connector (See page IN±31).
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

D00049
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±471
706 Author: Date:
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±472
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
707 Author: Date:
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 operated, this switch sends a signals 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±363.
INSPECTION PROCEDURE
See page DI±363.
DI02O±02

Q04869
NC2 Revolution Sensor
D01094
Direct Clutch
Speed Sensor 2V3
1
V3
G R
E99
E94ECM
NC2
+
NC2±4 ~ 6 V
*1: Except California, w/ Engine Immobilizer and / or TRAC
*2: California, w/ Engine Immobilizer and / or TRAC*2 *1
E1114
26 *2 *1
E11
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±473
708 Author: Date:
DTC P1705 NC2 Revolution Sensor Circuit Malfunction
(Direct Clutch Speed Sensor)
CIRCUIT DESCRIPTION
This sensor detects the rotation speed of the direct clutch drum.
By comparing the direct clutch speed signal and the vehicle
speed sensor signal, the ECM detects the shift timing of the
gears and appropriately controls the engine torque and hydrau-
lic pressure in response to various conditions, thus performing
smooth gear shifting.
DTC No.DTC Detecting ConditionTrouble Area
P1705
The ECM detects conditions (a), (b), (c), (d), (e) and (f) conti-
nuity for 4 sec or more.
(2 trip detection logic)
(a) Vehicle speed : 32 km/h (20 mph) or more
(b) 3rd or 4th gear
(c) NC2 < 300 rpm
(d) Park/neutral position switch: OFF
(e) Solenoid valves and vehicle speed sensor are normal
(f) L position: OFF

Open or short in direct clutch speed sensor circuit

Direct clutch speed sensor

ECM
WIRING DIAGRAM
DI02P±02

Q07936D00834D01913
NC2+NC2±
NC2+
NC2±
Except California, w/ Engine Immobilizer
and / or TRAC:
California, w/ Engine Immobilizer
and / or TRAC:
DI±474
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
709 Author: Date:
INSPECTION PROCEDURE
1 Check resistance between terminals NC2+ and NC2± of ECM.
PREPARATION:
Disconnect the connector from ECM.
CHECK:
Check resistance between terminals NC2+ and NC2± of ECM.
OK:
Resistance: 560 ~ 680 W
OK Check and replace the ECM.
NG

Q08218
Magnet
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±475
710 Author: Date:
2 Check No.2 vehicle speed sensor.
PREPARATION:
Remove the Direct clutch speed sensor from transaxle.
CHECK:
(a) Measure resistance between terminals 1 and 2 of speed
sensor.
(b) Check voltage between terminals 1 and 2 of the speed
sensor when a magnet is put close to the front end of the
speed sensor then taken away quickly.
OK:
(a) Resistance: 560 ~ 680 W
(b) Voltage is generated intermittently.
HINT:
The voltage generated is extremely low.
NG Replace the Direct clutch speed sensor.
OK
Check and repair the harness and connector
between ECM and Direct clutch speed sen-
sor (See page IN±31).

AT5608
0
1
Electric Current (A)
High
Accumulator Control Pressure
D00060
(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B is the period of non±continuity, then
D000621 msec./div.5 V/div.
GND Reference
Waveform between terminals SLN
+
and SLN± when engine is idling.Waveform between terminals SLN
+
and SLN± when during shift change.
1 msec./div.5 V/div.
GND DI±476
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
711 Author: Date:
DTC P1765Linear Solenoid for Accumulator Pressure Control
Circuit Malfunction (Shift Solenoid Valve SLN)
CIRCUIT DESCRIPTION
The shift solenoid valve SLN controls the hydraulic pressure
acting on the accumulator control valve when gears are shifted
and performs smooth gear shifting.
The ECM determines optimum operating pressure according to
the signals from the throttle position sensor, vehicle speed sen-
sor and direct clutch speed sensor and controls the volume of
current flow to the solenoid valve.
The amount of current to the solenoid is controlled by the (*)
duty ratio of ECM output signals, causing a momentary change
to the hydraulic pressure acting on the clutches during gear
shifting.
When the duty ratio is high, the hydraulic pressure acting on the
clutches is low.
DTC No.DTC Detecting ConditionTrouble Area
P1765
After the engine is warmed up, the current flow to the shift
solenoid valve SLN for 1 sec or more under condition (a) or
(b):
(a) Engine speed: 500 rpm or more
(b) Park/neutral position switch: ON (P or N position)

Open or short in shift solenoid valve SLN circuit

Shift solenoid valve SLN

ECM
DI02Q±02

D01095
Shift Solenoid
Valve SLN 1
4
B±YW±L3
2
SLN
±
SLN+
ECM
*1: Except California, w/ Engine Immobilizer and / or TRAC
*2: California, w/ Engine Immobilizer and / or TRAC*2 *1
E11
E3E10
E9 E3*2 *1
1920
R
L
E11
D00050
2
1
21
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±477
712 Author: Date:
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check shift solenoid valve SLN.
PREPARATION:
Disconnect the shift solenoid valve SLN connector.
CHECK:
(a) Measure resistance between terminals 1 and 2 of sole-
noid connector.
(b) Connect positive
lead with an 8 ~10 W bulb to terminal
1 of solenoid connector and negative lead to terminal
2, then check the movement of the valve.
OK:
(a) Resistance: 5.1 ~ 5.5 W
(b)
When battery positive voltage is applied.Valve move in direction in illustration.
(on the left)
When battery positive voltage is cut off.Valve move in direction in illustration.
(on the right)

D00051
(+)
(±)12
DI±478
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
713 Author: Date:
Reference
PREPARATION:
Connect positive
lead of the variable power supply to termi-
nal 1 of solenoid connector and negative lead to terminal 2.
CHECK:
(a) Check the movement of the valve when the voltage is
gradually increased.
(A current greater than 1A should not be supplied.)
(b) Check the movement of the valve when the voltage is cut
off.
OK:
(a) As the voltage is increased, the valve should move
slowly in the
direction.
(b) The valve should return in the
direction.
NG Replace the shift solenoid valve SLN.
OK
2 Check harness and connector between battery and shift solenoid valve SLN,
shift solenoid valve SLN and ECM (See page IN±31).
NG Repair or replace the harness or connector.
OK
Check and replace the ECM.