Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Hand-held tester: 

1. Check STA signal. 

   PREPARATION: 

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

   CHECK: 

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

   OK: 

   Ignition Switch Position table
   
   

   Ignition Switch Position	ON	START
   STA Signal	OFF	ON

   1. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 
   2. NG : Go To Next Step. 
2. Check starter relay (Marking: ST) (See ). 
   1. NG : Replace starter relay. 
   2. OK : Go To Next Step 
3. Check ignition switch (See  INSPECTION  ). 
   1. NG : Replace ignition switch. 
   2. OK : 
4. Check for open in harness and connector between ECM and starter relay (Marking: ST) (See  PROCEDURE  ). 
   1. NG : Repair or replace harness and connector. 
   2. OK : Check and replace ECM (See  PROCEDURE  ). 

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

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

   PREPARATION: 

   1. Disconnect the ECM with connector from body panel (See ENGINE CONTROL MODULE (ECM) ).
   2. Turn the ignition switch ON.

   CHECK: 

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

   OK: 

   1. Voltage: 6 V or more 
   Fig 1: Locating STA Terminal Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK : Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 
   2. NG : Go To Next Step. 
2. Check starter relay (Marking ST) (See ). 
   1. NG : Replace starter relay. 
   2. OK : Go To Next Step 
3. Check ignition switch (See  INSPECTION  ). 
   1. NG : Replace ignition switch. 
   2. OK : Go To Next Step 
4. Check for open in harness and connector between ECM and starter relay (Marking: ST) (See  PROCEDURE  ). 
   1. NG : Repair or replace harness and connector. 
   2. OK : Check and replace ECM (See  PROCEDURE  ).