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. Inspect ETCS fuse. 

   PREPARATION: 

   Remove the ETCS fuse from the F L block and J/B No. 1.

   CHECK: 

   Measure the resistance of the ETCS fuse.

   OK: 

   1. Below 1 Ω 
   Fig 1: Removing ETCS Fuse From FL Block & J/B No. 1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG : Check for short in all harness and components connected to ETCS fuse. 
   2. OK : Go to Next Step 
2. Check voltage between terminal +BM of ECM connector and body ground. 

   PREPARATION: 

   Remove the ECM cover.

   CHECK: 

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

   OK: 

   1. Voltage: 9 to 14 V 
   Fig 2: Locating ECM Connector Terminal +BM

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   2. NG : Go to Next Step 
3. Check harness and connectors between battery and ETCS fuse, and ETCS fuse and ECM (See  PROCEDURE  ). 
   1. NG : Repair or replace harness and connector. 
   2. OK : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ).