TOYOTA CAMRY 1999 Service Repair Manual

± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±459
694 Author: Date:
5 Check ECM (See page IN±31).
NG Replace ECM.
OK
Check and repair the transaxle (clutch, brake
or gear etc.).

Q07781
DI±460
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
695 Author: Date:
DTC P0750, P0755 Shift Solenoid A/B Malfunction
(Shift Solenoid Valve No.1/No.2)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor and direct clutch speed sensor to detect the actual
gear position (1st, 2nd, 3rd or O/D gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
trouble of the shift solenoid valves, valve body or automatic transaxle (clutch, brake or gear etc.)
DTC No.DTC Detecting ConditionTrouble Area
P0750
P0755During normal driving, the gear required by the ECM does not
match the actual gear
(2 trip detection logic)
Shift solenoid valve No.1/No.2 is stuck open or closed

Valve body is blocked up or stuck

Automatic transaxle (clutch, brake or gear etc.)
Check the shift solenoid valve No.1 when DTC P0750 is output and check the shift solenoid valve No.2 when
DTC P0755 is output.
INSPECTION PROCEDURE
1 Check shift solenoid valve No.1 or No.2 operation.
PREPARATION:
(a) Remove the oil pan.
(b) Remove the shift solenoid valve No.1 or No.2.
CHECK:
(a) 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 valve opens.
NG Replace the shift solenoid valve No.1 or No.2.
OK
DI02K±02

± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±461
696 Author: Date:
Check the valve body (See page DI±453).
NG Repair or replace the valve body.
OK
Repair the transaxle.

Position
NORMALSHIFT SOLENOID NO.1
MALFUNCTIONING
Solenoid valveNo.1 No.2GearSHIFT SOLENOID NO.2
MALFUNCTIONINGBOTH SOLENOIDS MAL-
FUNCTIONINGSolenoid valve
No.1 No.2GearSolenoid valve
No.1 No.2GearGear when shift selector is
manually operated
D
2
LON
ONOFF
ON
ON OFF
OFF OFF
ON
ONOFF
ON
ON OFF
ON
ON ONOFF1st
2nd
3rd
O/D
1st
2nd
3rd
1st
2ndX
X
X
X
X
X
X
X
XON
ON
OFF
OFFON
ON
ON3rd 3rd
O/D
3rd
3rd
1st
2ndX
X
X
X
X
X
X
X
X OFF
OFFON
ON OFF OFF
OFF
ON
ON1st
O/D
O/D1st O/D O/D
O/D
1st
1stO/D O/D O/D
O/D
O/D O/D
O/D
1st
1st
X: MalfunctionsON
ON3rd
3rd
DI±462
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
697 Author: Date:
DTC P0753, P0758 Shift Solenoid A/B Electrical Malfunc-
tion (Shift Solenoid Valve No.1/No.2)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valves No.1 and
No.2 controlled by ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM con-
trols the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (Fail safe func-
tion).
Fail Safe Function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid
ON and OFF to shift to the gear positions shown in the table below. The ECM also turns the shift solenoid
valve SL OFF at the same time. If both solenoids are malfunction, hydraulic control cannot be performed
electronically and must be done manually.
Manual shifting as shown in the following table must be done (In the case of a short circuit, the ECM stops
sending current to the short circuited solenoid).
Check the shift solenoid valve No.1 when DTC P0753 is output and check the shift solenoid valve No.2 when
DTC P0758 is output.
DTC No.DTC Detecting ConditionTrouble Area
P0753
P0758
The ECM checks for an open or short circuit in the shift sole-
noid valves No.1 and No.2 circuit when it changes.
The ECM records DTC P0753 or P0758 if condition (a) or (b) is
detected once, but it does not light up MIL.
After ECM detects condition (a) or (b) continuously 8 times or
more in a trip and the MIL light up.
(a) When the solenoid is energized, the solenoid resistance
is 8 W or less and is counted.
(b) When the solenoid is not energized, the solenoid resistance
is 100 kW or more and is counted.

Open or short in shift solenoid valve No.1/No.2 circuit

Shift solenoid valve No.1/No.2

ECM
DI02L±02

D01092
Transaxle
*1: Except California, w/ Engine Immobilizer and / or TRAC
*2: California, w/ Engine Immobilizer and / or TRACShift Solenoid
Valve No.1
W3
6 E3
L±B BV
J/C J26
A*2 *1
Shift Solenoid
Valve No.2
E3A
AL±BE11
E10 7
11
817
E10
E11 *2 *1ECM
B+
S1
S2B+
Cruise Control ECU
Q07642D00833D01909
California, w/ Engine Immobilizer
and / or TRAC:S1
S2
S1
S2
Except California, w/ Engine Immobilizer
and / or TRAC:
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±463
698 Author: Date:
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Measure resistance between terminal S1 or S2 of ECM and body ground.
PREPARATION:
Disconnect the connector from ECM.
CHECK:
Measure resistance between terminal S1 or S2 of ECM and
body ground.
OK:
Resistance: 11 ~ 15 W

D00832Q02283
Q07935
D01910
S1 S2
S1 S2S1
S2 S1 S2 California, w/ Engine Immobilizer
and / or TRAC: Except California, w/ Engine Immobilizer
and / or TRAC:
DI±464
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
699 Author: Date:
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 automatic trans-
axle.
CHECK:
Check the harness and connector between terminal S1 or S2
of ECM and terminal S1 or S2 of solenoid connector.
OK:
There is no open and no short circuit.
NG Repair or replace the harness or connector.
OK

D00048
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±465
700 Author: Date:
3 Check shift solenoid valve No.1 or No.2.
PREPARATION:
(a) Jack up the vehicle.
(b) Remove the oil pan.
(c) Disconnect the solenoid connector.
(d) Remove the shift solenoid valve No.1 or No.2.
CHECK:
(a) Measure resistance between solenoid connector and
body ground.
(b) Connect the positive
lead to terminal of solenoid con-
nector, negative  lead to solenoid body.
OK:
(a) Resistance: 11 ~ 15 W
(b) The solenoid makes an operating noise.
NG Replace the solenoid valve.
OK
Repair or replace the solenoid wire.

Q04874
Controlled
Pressure Line
Pressure
Drain Controlled
Pressure
Q08040
DI±466
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
701 Author: Date:
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) 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.
NG Replace the solenoid valve SL.
OK
DI02M±02

± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
DI±467
702 Author: Date:
2 Check valve body (See page DI±453).
NG Repair or replace the valve body.
OK
Check the torque converter clutch (See page AX±21).
NG Replace the torque converter clutch.
OK
Repair the transaxle.

D01093
Transaxle
Shift Solenoid
Valve SL
2
E3P±L
E10B+
SLECM
*1: Except California, w/ Engine Immobilizer and / or TRAC
*2: California, w/ Engine Immobilizer and / or TRACE11 *2*1
27
9
Y DI±468
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
703 Author: Date:
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) are 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
DI02N±02