Cold Start Injector Circuit: Wiring Diagram

1. Disconnect the E57 cold start injector connector.
2. Measure the resistance according to the value(s) in the table below.

Standard resistance 

NG : REPLACE COLD START INJECTOR 

Fig 2: Identifying E57 Cold Start Injector Connector

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OK : Go To Next Step 

1. Turn the engine switch on (IG).
2. Measure the voltage according to the value(s) in the table below.

Fig 3: Identifying E3 And E4 ECM Connector

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Standard voltage 

OK : REPLACE ECM 

NG : Go To Next Step 

1. Disconnect the E57 cold start injector connector.
2. Disconnect the E3 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard (Check for open) 

   STANDARD (CHECK FOR OPEN)
   
   

   Tester Connection	Specified Condition
   E57-1 - STJ1 (E3-7)	Below 1 Ω

   Standard (Check for short) 

   STANDARD (CHECK FOR SHORT)
   
   

   Tester Connection	Specified Condition
   E57-1 or STJ1 (E3-7) - Body ground	10 kΩ or higher

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 4: Identifying E3 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : CHECK AND REPLACE HARNESS AND CONNECTOR (COLD START INJECTOR - BATTERY POSITIVE TERMINAL)