Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

Electronic Control Module (ECM)

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OPERATION



The ECM receives signals from various sensors on the engine. It will then process this information and calculate the correct air/fuel mixture under all operating conditions. The ECM is a very fragile and expensive component. Always follow the precautions when servicing the electronic control system.

PRECAUTIONS





Do not permit parts to receive a severe impact during removal or installation. Always handle all fuel injection parts with care, especially the ECM. DO NOT open the ECM cover!
 
Before removing the fuel injected wiring connectors, terminals, ect., first disconnect the power by either disconnecting the negative battery cable or turning the ignition switch OFF .
 
Do not be careless during troubleshooting as there are numerous amounts of transistor circuits; even a slight terminal contact can induce troubles.
 
When inspecting during rainy days, take extra caution not to allow entry of water in or on the unit. When washing the engine compartment, prevent water from getting on the fuel injection parts and wiring connectors.
 

REMOVAL & INSTALLATION



See Figures 1 and 2

  1. Disconnect the negative battery cable.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: The ECM is usually found behind the glove box-1996 Land Cruiser shown

  1. Locate the ECM and release the lock, then pull out the connector. Pull on the connectors only!
  2.  



Click image to see an enlarged view

Fig. Fig. 2: Press down on the lock to release the connectors

  1. Unbolt the ECM from its mounting area.
  2.  

To install:
  1. Mount the ECM on the vehicle in the proper location.
  2.  
  3. Fully insert the connector, then check that it is locked.
  4.  

 
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