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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA1997PREVIA DX, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION SHIFT INTERLOCK SYSTEMSCOMPONENT TESTSELECTRONIC CONTROL UNIT (ECU)

1997 Toyota Previa DX, RWD

Electronic Control Unit (Ecu)

1997 Toyota Previa DX, RWDSECTION Electronic Control Unit (Ecu)

Access ECU. See Figure. ECU is under center console, in front or back of shifter. Turn ignition on. Backprobing ECU harness connector with DVOM, check voltage between designated terminals. Voltage should be as specified. See appropriate SHIFT LOCK SYSTEM PIN VOLTAGES table. For circuit identification, see appropriate wiring diagram in WIRING DIAGRAMS .

NOTE: Ground (GND) terminal is also referred to as "E" terminal.

SHIFT LOCK SYSTEM PIN VOLTAGES (AVALON & CAMRY)

Application & Terminals

Description

Voltage

ECU

ACC - GND

Ignition Switch In ACC Position

10-14

IG - GND

Ignition Switch In ON Position

10-14

STP - GND

Depress Brake Pedal

10-14

KLS - GND

Ignition Switch In ACC, Shifter In "P" Position

KLS - GND

Ignition Switch In ACC, Shifter Not In "P" Position

7.5-11.5

KLS - GND

⁽¹⁾ Ignition Switch In ACC, Shifter Not In "P" Position

6-9

Shift Lock Solenoid

SLS+ - GND

Ignition Switch In ACC, Shifter In "P" Position

SLS+ - GND

Depress Brake Pedal

8-13.5

SLS+ - GND

Ignition Switch In ACC, Shifter Not In "P" Position

Shift Lock Control Switch

P1 - P

Ignition Switch ON, Shifter In "P" Position, Depress Brake Pedal

P1 - P

Ignition Switch In ON, Shifter Not In "P" Position

9-13.5

P2 - P

Ignition Switch In ACC, Shifter In "P" Position

9-13.5

⁽¹⁾	Voltage measurement after one second.

NOTE: Ground (GND) terminal is also referred to as "E" terminal.

SHIFT LOCK SYSTEM PIN VOLTAGES (CELICA, COROLLA, ES300, GS300 (1997), GS400, LAND CRUISER, LX450, LX470, PASEO, PRIZM, TACOMA & TERCEL)

Application & Terminals

Description

Voltage

ECU

ACC - GND

Ignition Switch In ACC Position

10-14

IG - GND

Ignition Switch In ON Position

10-14

STP - GND

Depress Brake Pedal

10-14

KLS - GND

Ignition Switch In ACC, Shifter In "P" Position

KLS - GND

Ignition Switch In ACC, Shifter Not In "P" Position

⁽²⁾ 10-14

KLS - GND

⁽¹⁾ Ignition Switch In ACC, Shifter Not In "P" Position

6-9

Shift Lock Solenoid

SLS+ - SLS-

Ignition Switch In ACC, Shifter In "P" Position

SLS+ - SLS-

Depress Brake Pedal

8-13.5

SLS+ - SLS-

Depress Brake Pedal, (After 20 Seconds)

5.5-9.5

SLS+ - SLS-

Ignition Switch In ACC, Shifter Not In "P" Position

Shift Lock Control Switch

P1 - P

Ignition Switch In ON Position, Shifter In "P" Position, Depress Brake Pedal

P1 - P

Ignition Switch In ON, Shifter Not In "P" Position

9-13.5

P2 - P

Ignition Switch In ACC, Shifter In "P" Position

9-13.5

P2 - P

Ignition Switch In ACC, Shifter Not In "P" Position

⁽¹⁾	Voltage measurement after one second.

⁽²⁾	Voltage is 7.5-11 volts on 1997-98 ES300.

NOTE: Ground (GND) terminal is also referred to as "E" terminal.

SHIFT LOCK SYSTEM PIN VOLTAGES (1998 GS300 & 1998 GS400)

Application & Terminals

Description

Voltage

ECU

ACC - GND

Ignition Switch In ACC Position

10-14

ACC - GND

Ignition Switch In ON Position

10-14

KLS - GND

Ignition Switch In ACC, Shifter In "P" Position

KLS - GND

⁽¹⁾ Ignition Switch In ACC, Shifter Not In "P" Position

6-9

SLS+ - GND

Ignition Switch In ON, Shifter In "P" Position

SLS+ - GND

Ignition Switch In ON, Depress Brake Pedal

3-6

SLS+ - GND

Ignition Switch In ON, Release Brake Pedal

SLS+ - GND

Ignition Switch In ACC, Shifter Not In "P" Position

3-6

P1 - GND

Shifter In "P" Position

P1 - GND

Shifter Not In "P" Position

10-14

⁽¹⁾	Voltage measurement after one second.

NOTE: Ground (GND) terminal is also referred to as "E" terminal.

SHIFT LOCK SYSTEM PIN VOLTAGES (LS400)

Application & Terminals

Description

Voltage

ECU

ACC - GND

Ignition Switch In ACC Position

10-14

IG - GND

Ignition Switch In ON Position

10-14

STP - GND

Depress Brake Pedal

10-14

KLS - GND

Ignition Switch In ACC, Shifter In "P" Position

1.5 Or Less

KLS - GND

Ignition Switch In ACC, Shifter Not In "P" Position

8.5-10.5

KLS - GND

⁽¹⁾ Ignition Switch In ACC, Shifter Not In "P" Position

7-8.5

Shift Lock Solenoid

SLS+ - SLS-

Ignition Switch In ACC, Shifter In "P" Position

SLS+ - SLS-

Depress Brake Pedal

8.8-12.5

SLS+ - SLS-

Depress Brake Pedal, (After 20 Seconds)

6.5-9.2

SLS+ - SLS-

Ignition Switch In ACC, Shifter Not In "P" Position

Shift Lock Control Switch

P1 - P

Ignition Switch In ON Position, Shifter In "P" Position, Depress Brake Pedal

P1 - P

Ignition Switch In ON, Shifter Not In "P" Position

10-14

P2 - P

Ignition Switch In ACC, Shifter In "P" Position

10-14

P2 - P

Ignition Switch In ACC, Shifter Not In "P" Position

⁽¹⁾	Voltage measurement after one second.

NOTE: Ground (GND) terminal is also referred to as "E" terminal.

SHIFT LOCK SYSTEM PIN VOLTAGES (RAV4)

Application & Terminals

Description

Voltage

ECU

ACC - GND

Ignition Switch In ACC Position

10-14

IG - GND

Ignition Switch In ON Position

10-14

STP - GND

Depress Brake Pedal

10-14

KLS - GND

Ignition Switch In ACC, Shifter In "P" Position

KLS - GND

Ignition Switch In ACC, Shifter Not In "P" Position

7.5-11

KLS - GND

⁽¹⁾ Ignition Switch In ACC, Shifter Not In "P" Position

5.5-10

Shift Lock Solenoid

SLS+ - GND

Ignition Switch In ACC, Shifter In "P" Position

SLS+ - GND

Depress Brake Pedal

8-14

SLS+ - GND

Ignition Switch In ACC, Shifter Not In "P" Position

Shift Lock Control Switch

P1 - P

Ignition Switch In ON Position, Shifter In "P" Position, Depress Brake Pedal

P1 - P

Ignition Switch In ON, Shifter Not In "P" Position

10-14

P2 - P

Ignition Switch In ACC, Shifter In "P" Position

10-14

⁽¹⁾	Voltage measurement after one second.

NOTE: Ground (GND) terminal is also referred to as "E" terminal.

SHIFT LOCK SYSTEM PIN VOLTAGES (SC300, SC400, SUPRA & 4RUNNER)

Application & Terminals

Description

Voltage

ECU

ACC - GND

Ignition Switch In ACC Position

10-14

IG - GND

Ignition Switch In ON Position

10-14

STP - GND

Depress Brake Pedal

10-14

KLS - GND

Ignition Switch In ACC, Shifter In "P" Position

KLS - GND

Ignition Switch In ACC, Shifter Not In "P" Position

7.5-11

KLS - GND

⁽¹⁾ Ignition Switch In ACC, Shifter Not In "P" Position

6-9.5

Shift Lock Solenoid

SLS+ - SLS-

Ignition Switch In ACC, Shifter In "P" Position

SLS+ - SLS-

Depress Brake Pedal

8-13.5

SLS+ - SLS-

Depress Brake Pedal (After 20 Seconds)

6-8.5

SLS+ - SLS-

Ignition Switch In ACC, Shifter Not In "P" Position

Shift Lock Control Switch

P1 - P

Ignition Switch In ON Position, Shifter In "P" Position, Depress Brake Pedal

P1 - P

Ignition Switch In ON, Shifter Not In "P" Position

9-13.5

P2 - P

Ignition Switch In ACC, Shifter In "P" Position

9-13.5

P2 - P

Ignition Switch In ACC, Shifter Not In "P" Position

⁽¹⁾	Voltage measurement after one second.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.