Inspection Procedure

HINT

Start the engine before inspection. Check the IG1 relay or battery if the engine does not start.

1. INSPECT FUSE (ECU-IG LH) 
   1. Remove the ECU-IG LH fuse from the cowl side junction block LH
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATIONS
      
      

      Tester Item	Condition	Specified Condition
      ECU-IG LH fuse	Always	Below 1 Ω

      Fig 1: Identifying ECU-IG LH Fuse

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE FUSE (ECU-IG LH) 

   OK: Go to next step 

2. INSPECT A/C AMPLIFIER (IG+ - GND) 
   1. Remove the A/C amplifier with its connectors still connected.
   2. Turn the engine switch on (IG)
   3. Measure the voltage according to the value(s) in the table below

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATIONS
      
      

      Tester Connection	Switch Condition	Specified Condition
      J58-21 (IG+) - J58-20 (GND)	Engine switch on (IG)	11 to 14 V

   Fig 2: Identifying J58 Connector Terminals
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step 3 

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

3. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY) 
   1. Disconnect the A/C amplifier connector
   2. Measure the voltage according to the value(s) in the table below

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATIONS
      
      

      Tester Connection	Switch Condition	Specified Condition
      J58-21 (IG+) - Body ground	Engine switch off	Below 1 V
      	Engine switch on (IG)	11 to 14 V

   Fig 3: Identifying J58 Connector Terminals (IG+)
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

4. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BODY GROUND) 
   1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATIONS
      
      

      Tester Connection	Condition	Specified Condition
      J58-20 (GND) - Body ground	Always	Below 1 Ω

   Fig 4: Identifying J58 Connector Terminals (GND)
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE A/C AMPLIFIER  (See REMOVAL  )