Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records 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 WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch ON and turn the tester ON.
   3. Clear DTCs (see DTC CHECK / CLEAR  ).
   4. Shuffle arrangement of the ignition coils (among No. 1 to No. 4 cylinders).
      NOTE: Do not shuffle the connectors.
   5. Perform a simulation test.
   6. Check DTCs displayed on the tester.

      Result 

      RESULT CHART
      
      

      Display (DTC Output)	Proceed to
      P0351, P0352, P0353 or P0354	A
      Other ignition coil DTC output	B

   B : REPLACE IGNITION COIL 

   A : GO TO NEXT STEP 

2. INSPECT ECM (IGT1, IGT2, IGT3, IGT4 AND IGF SIGNAL) 
   1. Inspect the ECM using an oscilloscope.
      Fig 1: Identifying IGT4 Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. While cranking or idling, check the waveform between the terminals of the E3 and E4 ECM connectors.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      IGT1 (E3-17) - E1 (E3-3)	Correct waveform is as shown
      IGT2 (E3-16) - E1 (E3-3)	Correct waveform is as shown
      IGT3 (E3-15) - E1 (E3-3)	Correct waveform is as shown
      IGT4 (E3-14) - E1 (E3-3)	Correct waveform is as shown
      IGF1 (E3-23) - E1 (E3-3)	Correct waveform is as shown

   OK : REPLACE ECM 

   Fig 2: Connector Terminals Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG : GO TO NEXT STEP 

3. CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM) 
   1. Disconnect the I2, I3, I4 or I5 ignition coil connector.
   2. Disconnect the E3 ECM connector.
      Fig 3: Identifying E3 ECM Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Measure the resistance of the wire harness side connectors.
      Fig 4: Identifying Ignition Coil Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      IGF (I2-2) - IGF1 (E3-23)	Below 1 Ω
      IGF (I3-2) - IGF1 (E3-23)	Below 1 Ω
      IGF (I4-2) - IGF1 (E3-23)	Below 1 Ω
      IGF (I5-2) - IGF1 (E3-23)	Below 1 Ω

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      IGT (I2-3) - IGT1 (E3-17)	Below 1 Ω
      IGT2 (I3-3) - IGT2 (E3-16)	Below 1 Ω
      IGT3 (I4-3) - IGT3 (E3-15)	Below 1 Ω
      IGT4 (I5-3) - IGT4 (E3-14)	Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      IGF (I2-2) or IGF1 (E3-23) - Body ground	10 kΩ or higher
      IGF (I3-2) or IGF1 (E3-23) - Body ground	10 kΩ or higher
      IGF (I4-2) or IGF1 (E3-23) - Body ground	10 kΩ or higher
      IGF (I5-2) or IGF1 (E3-23) - Body ground	10 kΩ or higher

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      IGT (I2-3) or IGT1 (E3-17) - Body ground	10 kΩ or higher
      IGT2 (I3-3) or IGT2 (E3-16) - Body ground	10 kΩ or higher
      IGT3 (I4-3) or IGT3 (E3-15) - Body ground	10 kΩ or higher
      IGT4 (I5-3) or IGT4 (E3-14) - Body ground	10 kΩ or higher

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : GO TO NEXT STEP 

4. INSPECT IGNITION COIL (POWER SOURCE) 
   1. Disconnect the I2, I3, I4 or I5 ignition coil connector.
   2. Measure the resistance of the ignition coil connectors.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      GND (I2-4) - Body ground	Below 1 Ω
      GND (I3-4) - Body ground
      GND (I4-4) - Body ground
      GND (I5-4) - Body ground

      Fig 5: Identifying Ignition Coil Connector Terminals - Wire Harness Side

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Turn the ignition switch ON.
   4. Measure the voltage between the terminals of the wire harness side connectors.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      +B (I2-1) - GND (I2-4)	9 to 14 V
      +B (I3-1) - GND (I3-4)	9 to 14 V
      +B (I4-1) - GND (I4-4)	9 to 14 V
      +B (I5-1) - GND (I5-4)	9 to 14 V

   NG : Go to step 5 

   OK : REPLACE IGNITION COIL 

5. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - IGNITION SWITCH) 
   1. Disconnect the I2, I3, I4 or I5 ignition coil connector.
      Fig 6: Identifying Ignition Switch Connector Terminals - Wire Harness Side

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Disconnect the I10 ignition switch connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      +B (I2-1) - IG2 (I10-6)	Below 1 Ω
      +B (I3-1) - IG2 (I10-6)	Below 1 Ω
      +B (I4-1) - IG2 (I10-6)	Below 1 Ω
      +B (I5-1) - IG2 (I10-6)	Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      +B (I2-1) or IG2 (I10-6) - Body ground	10 kΩ or higher
      +B (I3-1) or IG2 (I10-6) - Body ground	10 kΩ or higher
      +B (I4-1) or IG2 (I10-6) - Body ground	10 kΩ or higher
      +B (I5-1) or IG2 (I10-6) - Body ground	10 kΩ or higher

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 7: Identifying I10 Ignition Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPLACE IGNITION COIL