Toyota Corolla (E120): Inspection procedure

1 Inspect terminal voltage(idl)

  1. Remove the cruise control ecu assy with connector still connected.
  2.  disconnect the ecm connector.
  3.  turn the ignition switch to on.
  4.  measure voltage between terminal 13 (idl) of cruise control ecu assy connector and body ground when the throttle valve is fully closed and fully opened.

    Ok:

2 Check harness and connector(between cruise control ecu assy

2 Check harness and connector(between cruise control ecu assy and ecm)

  1. Check for open and short circuit in harness and connector between cruise control ecu assy and ecm

Check and replace cruise control ecu assy

Check and replace cruise control ecu assy

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    Circuit description
    When the idle switch is turned on, a signal is sent to the cruise control ecu assy. The cruise control ecu assy uses this signal to correct the discrepancy between the throttle valve position and the actuator position sensor values to enable accurate cruise control at the set speed. If the idl ...