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 DTC. 

   PREPARATION: 

   1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
   2. Turn ON the ignition switch and push the hand-held tester or the OBD II scan tool main switch ON.
   3. Warm up the engine.
   4. Run the engine at 3,000 RPM for 10 seconds or more.
   5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

   CHECK: 

   Read the DTC.

   OK: 

   DTC OUTPUT
   
   

   Display (DTC output)	Proceed to
   P0327 and/or P0328 are output again	A
   No DTCs are output again	B

   1. B: Check for intermittent problems. (see  PRE-CHECK  ) 
   2. A: Go To Next Step. 
2. Check for open and short in wire harness between ECM and knock sensor (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   1. NG: Go to step   4 . 
   2. OK: Go To Next Step. 
3. Check voltage between terminal KNK1 and EKNK of ECM connector. 

   PREPARATION: 

   Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between terminals KNK1 and EKNK of the ECU connector.

   OK: 

   Voltage: 4.5 to 5.5 V 

   Fig 1: Identifying Terminal KNK1 & EKNK Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Reference: INSPECTION USING OSCILLOSCOPE 

   HINT:

   The correct waveform is as shown in the illustration.

   ITEM AND CONTENTS
   
   

   Item	Contents
   Terminal	KNK1 - EKNK
   Equipment Set	0.01 to 10 V/DIV. 0.01 to 10 msec./DIV.
   Condition	After warming up the engine, keep engine speed 4,000 rpm

   Fig 2: KNK Signal Waveform Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Replace ECM (see  ENGINE CONTROL MODULE (ECM)  ). 
   2. OK: Check for intermittent problems (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   NOTE: Fault may be intermittent. Check the harness and connectors carefully.
4. Check knock sensor. 

   PREPARATION: 

   Disconnect the sensor connector.

   CHECK: 

   Check the resistance between terminals 1 and 2 of the sensor.

   OK: 

   Resistance: 120 to 280 kΩ 

   Fig 3: Identifying Knock Sensor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Replace knock sensor. 
   2. OK: Check and replace harness and connector.