Inspection Procedure

PREPARATION: 

1. Remove the ECM with the connectors being connected.
2. Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between terminal PI of the ECM connector and the body ground when the main switch is ON and OFF.

   Fig 1: Checking Voltage Between Terminal PI Of ECM Connector And Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: 

   IGNITION SWITCH CONDITIONS
   
   

   Switch Condition	Specified Condition
   OFF	10 to 14V
   ON	0 to 3V

1. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE   ). 
2. NG : Go to next step. 

1. NG : Replace combination meter. 
2. OK : Check and replace engine ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ).