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, and other data from the time the malfunction occurred.

1. Check ETCS fuse. 

   PREPARATION: 

   Remove the ETCS fuse from the engine room R/B.

   CHECK: 

   Check the resistance of the ETCS fuse.

   OK: 

   Resistance : Below 1 Ω 

   Fig 1: Locating ETCS Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG : Replace ETCS fuse. 
   2. OK : Go to next step. 
2. Check voltage between terminal +BM of ECM connector and body ground. 

   PREPARATION: 

   Remove the glove compartment (see COMPONENTS ).

   CHECK: 

   Measure the voltage between terminal +BM of the ECM connector and body ground.

   OK: 

   Voltage: 9 to 14 V 

   Fig 2: Checking Voltage Between Body Ground And Terminal +BM (+) Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK : Replace ECM (see  COMPONENTS  ).  
   2. NG : Go to next step. 
3. Check for open in wire harness between battery and ETCS fuse, and ETCS fuse and ECM (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  in INTRODUCTION article).  
   1. NG : Repair or replace harness and connector. 
   2. OK : Check and repair engine room R/B.