Cold Start Injector Circuit: Procedure

1. Disconnect the E57 cold start injector connector.
   Fig 1: Identifying Connector Terminals

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   1 - 2	20°C (68°F)	11.6 to 12.6 Ω

NG → REPLACE COLD START INJECTOR 

OK: Go to next step 

1. Turn the engine switch on (IG).
   Fig 2: Identifying E3 And E4 ECM Connector

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2. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Specified condition
   STJ1 (E3-7) - E1 (E4-7)	9 to 14 V

OK → REPLACE ECM 

NG: Go to next step 

1. Disconnect the E57 cold start injector connector.
   Fig 3: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E3 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard (Check for open)

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

   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 

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