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 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 : Go to step 2 

OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOM TABLE  (See PROBLEM SYMPTOMS TABLE  )

1. Disconnect the connector of pattern select switch.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   K42-3 (E) - Body ground	Always	Below 1 Ω

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 1: Identifying Terminals Of K42 Pattern Select Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to next step 

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

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   3 (E) -1 (2ND)	Press continuously Pattern select switch (SNOW)	Below 1 Ω
   	Release Pattern select switch (SNOW)	10 kΩ or higher

NG : REPLACE PATTERN SELECT SWITCH ASSEMBLY 

Fig 2: Identifying Terminals Of K42 Pattern Select Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   K68-17 (SNOW) - Body ground	Press continuously Pattern select switch (SNOW)	Below 1 Ω
   	Release Pattern select switch (SNOW)	10 kΩ or higher

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 3: Identifying Terminals Of Main Body ECU RH Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOM TABLE  (See PROBLEM SYMPTOMS TABLE  )