Turn ignition off. Disconnect cold start injector electrical connector. See Fig 1. Using a DVOM, measure resistance between cold start injector terminals. Resistance should be 2-4 ohms. If resistance is not as specified, replace cold start injector.

Fig 1: Measuring Cold Start Injector Resistance (Typical)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect negative battery cable. Remove cold start injector from engine. Place cold start injector into a container to catch fuel spray. Turn ignition on. DO NOT start engine.
Using a jumper wire, connect terminals FP and +B of check connector. Connect battery voltage to cold start injector terminals.
CAUTION: Immediately observe fuel spray after applying battery voltage to cold start injector.
Ensure an even, cone-shaped fuel spray is observed from cold start injector. If fuel spray is not satisfactory, replace cold start injector. If fuel spray is satisfactory, remove battery voltage from cold start injector.
With cold start injector still placed in container, observe cold start injector tip. If injector drips more than one drop of fuel within one minute, replace cold start injector.
Using a DVOM, measure resistance of cold start injector time switch. See COLD START INJECTOR TIME SWITCH RESISTANCE table. See Fig 2. If resistance is not as specified, replace cold start injector time switch.

COLD START INJECTOR TIME SWITCH RESISTANCE

Fig 2: Cold Start Injector Time Switch Terminal ID (Typical)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Cold Start System