Inspection Procedure

HINT:

This DTC chart is based on the premise that the engine is cranked normally. If the engine is not cranked, proceed to the problem symptoms table on PROBLEM SYMPTOMS TABLE  .

Hand-held tester: 

1. Check STA signal. 

   PREPARATION: 

   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch to ON and turn the hand-held tester main switch ON.

   CHECK: 

   Read the STA signal on the hand-held tester while the starter is operating.

   OK: 

   STA SIGNAL SPECIFICATION TABLE
   
   

   Ignition Switch Position	ON	START
   STA Signal	OFF	ON

   • OK: Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE   ). 
   • NG: Go to next step. 
2. Check for open in harness and connectors between ECM and starter relay (Marking: ST) (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   • NG: Repair or replace harness or connector. 
   • OK: Replace ECM (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 

OBD II scan tool (excluding the hand-held tester): 

1. Check voltage between terminal STA of ECM connector and body ground. 

   PREPARATION: 

   1. Turn the ignition switch to ON.

   CHECK: 

   Measure the voltage between the terminal STA of the ECM connector and body ground during the engine cranking.

   OK: 

   Voltage: 6 V or more 

   Fig 1: Checking Voltage Between Terminal STA And Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • OK: Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE   ). 
   • NG: Go to next step. 
2. Check for open in harness and connectors between ECM and starter relay (Marking: ST) (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   • NG: Repair or replace harness or connector. 
   • OK: Replace ECM (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ).