On-Vehicle Inspection

HINT:

The IG1 NO. 1 relay is built in the engine room junction block. Since the relay is constructed with a relay block that is in the junction block as a unit, it is impossible to disconnecting the wire harness connecting with the relay block.

If the relay has a malfunction, replace it with the junction block assembly wire harness together.

1. CHECK ENGINE ROOM JUNCTION BLOCK (IG1 NO. 1) 
   1. Disconnect the engine room relay block from the vehicle body.
      Fig 1: Identifying Engine Room Relay Block

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   2. Check the continuity of the relay.

      OK 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Always	Tester Connection	Specified Condition
      Constant	1B-50 - 1B-40	Continuity
      Apply B+ between terminals 1B-50 - 1B-40	1C-2 - 1B-47	Continuity

      If the continuity is not as specified, replace the engine room junction block.

   3. Install the engine room relay block to the vehicle body.
2. CHECK IG1 NO. 2 RELAY (Marking: IG1 NO. 2) 
   1. Remove the relay from the cowl side junction block LH.
      Fig 2: Identifying Cowl Side Junction Block LH

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   2. Measure the resistance of the relay.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      3 - 5	10 kΩ or higher
      3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

      If the result is not as specified, replace the relay.

   3. Install the relay.
   Fig 3: Relay Circuit Diagram

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3. CHECK IG1 NO. 3 RELAY (Marking: IG1 NO. 3) 
   1. Remove the relay from the cowl side junction block RH.
   2. Measure the resistance of the relay.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      3 - 5	10 kΩ or higher
      3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

      If the result is not as specified, replace the relay.

   3. Install the relay.
   Fig 4: IG1 No. 3 Relay Circuit Diagram

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002