Toyota Corolla 1988-1997 Repair Guide

Cold Start Injector Time Switch

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OPERATION



The start injector time switch controls the length of time the injector will stay on depending on engine temperature.

TESTING



See Figures 1, 2 and 3



Click image to see an enlarged view

Fig. Fig. 1: Schematic of the start injector time switch circuit

  1. Using an ohmmeter, measure the resistance between each of the terminals. They should be as follows:
  2.  



Click image to see an enlarged view

Fig. Fig. 2: Measure the resistance between the terminals of the time switch

  1. If the resistance is not as specified, replace the switch.
  2.  



Click image to see an enlarged view

Fig. Fig. 3: The time switch should exhibit the values shown

REMOVAL & INSTALLATION



Perform this procedure only on a cold engine.

  1. Drain the cooling system as necessary.
  2.  
  3. With the ignition OFF , unplug the electrical connector to the switch.
  4.  
  5. Using the proper sized wrench, carefully unscrew the switch from the engine.
  6.  

To install:
  1. Coat the threads of the switch with a sealant and install it.
  2.  
  3. Plug the electrical connector into the switch.
  4.  
  5. Refill the coolant to the proper level. Road test the vehicle for proper operation.
  6.  

 
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