Pattern Select Switch Snow Mode Circuit: 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 nonskid 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 → See 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 the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Specified Condition
   3 - Body ground	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Switch Condition	Tester Connection	Specified Condition
   Press continuously Pattern select switch (SNOW)	1 - 3	Below 1 Ω
   Release Pattern select switch (SNOW)	↑	10 kΩ or higher

NG → REPLACE PATTERN SELECT SWITCH ASSEMBLY 

OK: Go to next step 

1. Connect the connector of pattern select switch.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Switch Condition	Tester Connection	Specified Condition
   Press continuously Pattern select switch (SNOW)	J75-17 (SNOW) - Body ground	Below 1 Ω
   Release Pattern select switch (SNOW)	↑	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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