Cold Start Injector Circuit: Procedure

WARNING: This page is about a different car, the 2009 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT COLD START INJECTOR

Disconnect the E57 cold start injector connector.

Fig 1: Identifying Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

INSPECT ECM (STJ1 VOLTAGE)

Turn the engine switch on (IG).

Fig 2: Identifying E3 And E4 ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

CHECK HARNESS AND CONNECTOR (COLD START INJECTOR - ECM)

Disconnect the E57 cold start injector connector.

Fig 3: Identifying Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the E3 ECM connector.

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)