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. READ OUTPUT DTC 
   1. Clear the DTC (See DTC CHECK/CLEAR ).
   2. Warm up the engine.
   3. Run the engine at 3,000 rpm for 10 seconds or more.
   4. Connect the hand-held tester or the OBD II scan tool to the DLC3.
   5. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON.
   6. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
   7. Read the DTC.

   Result: 

   DTC OUTPUT RESULT TABLE
   
   

   Display (DTC output)	Proceed to
   Only P0325 is output again	A
   P0325, P0327 and/or P0328 are output again	B
   P0325, P0327 and/or P0328 are not output again	C

   B: Go to step 3 

   C: Check for intermittent problems 

   A: Go to next step 

2. INSPECT KNOCK SENSOR 
   1. Check the knock sensor installation.

      OK: Torque is 20 N.m (204 kgf.cm, 15 ft.lbf) 

   Fig 1: Checking Knock Sensor Installation

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   NG: TIGHTEN SENSOR 

   OK: REPLACE KNOCK SENSOR 

3. CHECK WIRE HARNESS (ECM - KNOCK SENSOR) 
   1. Disconnect the E10 ECM connector.
   2. Check the resistance of the wire harness side connector.
   Fig 2: Disconnecting E10 ECM Connector
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Standard: 

   ECM - KNOCK SENSOR - RESISTANCE TABLE
   
   

   Tester Connection	Condition	Specified Condition
   E10-29 (KNK1) - E10-30 (EKNK)	20°C (68°F)	120 to 280 kΩ

   NG: Go To Step 5 

   OK: Go to next step 

4. INSPECT ECM (KNK1 VOLTAGE) 
   1. Disconnect the E10 ECM connector.
   2. Turn the ignition switch ON.
   3. Check the voltage of ECM terminals.
   Fig 3: Disconnecting E10 ECM Connector
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Voltage: 

   ECM CONNECTOR - VOLTAGE TABLE
   
   

   Tester Connection	Specified Condition
   E10-29 (KNK1) - E10-30 (EKNK)	4.5 to 5.5 V

   NG: REPLACE ECM (See  ECM (2AZ-FE)  ) 

   OK: CHECK FOR INTERMITTENT PROBLEMS 

   NOTE: Fault may be intermittent. Check the harness and connectors carefully.
5. INSPECT KNOCK SENSOR 
   1. Remove the knock sensor.
   2. Check the resistance between the terminals.

      OK: Resistance is 120 to 280 kΩ at 20°C (68°F) 

   Fig 4: Checking Resistance Between Knock Sensor Terminals

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   NG: REPLACE KNOCK SENSOR 

   OK: REPAIR OR REPLACE HARNESS AND CONNECTOR