Inspection Procedure

1. Start the engine.
2. Turn the ECT SNOW switch "OFF" (Normal drive mode).
3. Confirm vehicle response by driving from a parked position to fully depressing the accelerator pedal.
4. Turn the ECT SNOW switch "ON" and perform the same check as above.

Confirm that there is a difference between ECT SNOW switch "ON" and "OFF".

HINT:

• Driving test should be done on a paved road (a non-skid road).
• Make sure not to use the TRAC system when testing a vehicle equipped with one.

OK: 

There is a difference in acceleration between "ON" and "OFF". 

NG: Go to step   2 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOM TABLE 

1. Disconnect the connector of pattern select switch.
2. Measure the resistance according to the value(s) in PATTERN SELECT SWITCH ASSEMBLY - BODY GROUND  .

Standard resistance 

Fig 1: Checking Harness And Connector (Pattern Select Switch Assembly - Body Ground)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go To Next Step 

1. Measure the resistance according to the value(s) in PATTERN SELECT SWITCH ASSEMBLY  .

Standard resistance 

Fig 2: Inspecting Pattern Select Switch Assembly

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE PATTERN SELECT SWITCH ASSEMBLY 

OK: Go To Next Step 

1. Connect the connector of pattern select switch.
2. Disconnect the cowl side junction block (main body ECU RH) connector.
3. Measure the resistance between terminal SNOW of the cowl side junction block (main body ECU RH) and body ground.

Standard resistance 

Fig 3: Checking Harness And Connector (Pattern Select Switch Assembly - Main Body ECU)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOM TABLE