The cold start injector is mounted in the intake air stream. Controlled by the ECU, it provides additional fuel during cold engine start-up. Its function is controlled by both a timer circuit and as a function of coolant temperature. The 5S-FE and 1MZ-FE engines are not equipped with a cold start injector.
REMOVAL & INSTALLATION
See Figure 1
- With the ignition OFF , disconnect the negative battery cable. For vehicles equipped with airbag systems, wait at least 90 seconds after disconnecting the battery before commencing any other work.
- Disconnect the electrical harness from the cold start injector.
- Place a container or towel under the cold start injector.
- Slowly loosen the union bolt; contain fuel spillage. Remove the bolt and washers. Plug the fuel line immediately to prevent spillage and entry of dirt.
- Remove the bolts holding the injector; remove the injector and gasket.
- Using a new gasket, install the cold start injector. Tighten the bolts to 52-70 inch lbs. (6-8 Nm)
- Install the fuel line with new gaskets. Tighten the union bolt to 11-15 ft. lbs. (15-20 Nm).
The gaskets at the fuel fitting must be replaced every time the joint is loosened or disassembled.
- Connect the cold start injector harness.
- Reinstall the throttle body if it was removed.
- Connect the negative battery cable.
- Switch the ignition OFF .
- Disconnect the electrical wiring from the cold start injector
- Use an ohmmeter to check the resistance of the injector. Correct resistance is 2-4 ohms at 68°F (20°C). The resistance may vary slightly with the temperature of the injector. Use common sense and good judgment when testing.
- If the resistance is not within specifications, it must be replaced.
- Reconnect the wiring harness to the injector.