Inspection Procedure

HINT:

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 resistance between terminal KNK1 of ECM connector and body ground. 

   PREPARATION: 

   1. Disconnect the E5 connector of the ECM.

   CHECK: 

   Measure the resistance between terminal KNK1 of the ECM connector and body ground.

   OK: Resistance: 10 kΩ or higher 

   Fig 1: Checking Resistance Between Terminal KNK1 And Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • OK: Go to step 3. 
   • NG: Go to next step. 
2. Check knock sensor 1 (See  INSPECTION  ). 
   • NG: Replace knock sensor 1. 
   • OK: Go to next step. 
3. Check for open and short in harness and connectors between ECM and knock sensor 1 (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   • NG: Repair or replace harness or connector. 
   • OK: Go to next step. 
4. Does malfunction disappear when a good knock sensor 1 is installed? 
   • YES: Replace knock sensor 1. 
   • NO: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ).