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Home >> Toyota >> 2009 >> Prius Base >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> SFI System >> DTC P0351 Ignition Coil "A" Primary / Secondary Circuit; DTC P0352 Ignition Coil "B" Primary/Secondary Circuit; DTC P0353 Ignition Coil "C" Primary / Secondary Circuit; DTC P0354 Ignition Coil "D" Primary / Secondary Circuit >> Inspection Procedure

Inspection Procedure

HINT:

Read freeze frame data using Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

  1. CHECK SPARK PLUG AND SPARK OF MISFIRING CYLINDER 

    OK: 

    Spark occurs. 

    NG:  Go to step  4

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM (IGF SIGNAL TERMINAL)) 
    1. Disconnect the I1, I2, I3 or I4 ignition coil and igniter connector.
      Fig 1: Identifying Ignition Coil Connector Terminals
      G05188726Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E4 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      I1-2 (IGf) - E4-23 (IGF) Below 1 Ω
      I2-2 (IGf) - E4-23 (IGF) Below 1 Ω
      I3-2 (IGf) - E4-23 (IGF) Below 1 Ω
      I4-2 (IGf) - E4-23 (IGF) Below 1 Ω
      Fig 2: Identifying E4 ECM Connector Terminal
      G05188727Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      I1-2 (IGf) or E4-23 (IGF) - Body ground 10 kΩ or higher
      I2-2 (IGf) or E4-23 (IGF) - Body ground 10 kΩ or higher
      I3-2 (IGf) or E4-23 (IGF) - Body ground 10 kΩ or higher
      I4-2 (IGf) or E4-23 (IGF) - Body ground 10 kΩ or higher
    4. Reconnect the ignition coil and igniter connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. CHECK ECM (IGF VOLTAGE) 
    1. Disconnect the I1, I2, I3 or I4 ignition coil and igniter connector.
    2. Turn the power switch ON (IG).
    3. Measure the voltage between the specified terminals of the E4 and E5 ECM connectors.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      E4-23 (IGF) - E5-28 (E1) 4.5 to 5.5 V
    4. Reconnect the ignition coil and igniter connector.

    NG: REPLACE ECM 

    Fig 3: Identifying ECM Connector Terminal
    G05188728Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE IGNITION COIL 

  4. CHECK HARNESS AND CONNECTOR (IGNITION - ECM (IGT SIGNAL TERMINAL)) 
    1. Disconnect the I1, I2, I3 or I4 ignition coil and igniter connector.
      Fig 4: Identifying Ignition Coil Connector Terminal
      G05188702Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E4 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      I1-3 (IGt) - E4-8 (IGT1) Below 1 Ω
      I2-3 (IGt) - E4-9 (IGT2) Below 1 Ω
      I3-3 (IGt) - E4-10 (IGT3) Below 1 Ω
      I4-3 (IGt) - E4-11 (IGT4) Below 1 Ω
      Fig 5: Identifying E4 ECM Connector Terminal
      G05188701Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      I1-3 (IGt) or E4-8 (IGT1) - Body ground 10 kΩ or higher
      I2-3 (IGt) or E4-9 (IGT2) - Body ground 10 kΩ or higher
      I3-3 (IGt) or E4-10 (IGT3) - Body ground 10 kΩ or higher
      I4-3 (IGt) or E4-11 (IGT4) - Body ground 10 kΩ or higher
    4. Reconnect the ignition coil and igniter connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK ECM (IGT1, IGT2, IGT3 OR IGT4 VOLTAGE) 
    1. Measure the voltage between the applicable terminals of the E4 and E5 ECM connectors when the engine is cranked.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      E4-8 (IGT1) - E5-28 (E1) 0.1 to 4.5 V
      E4-9 (IGT2) - E5-28 (E1) 0.1 to 4.5 V
      E4-10 (IGT3) - E5-28 (E1) 0.1 to 4.5 V
      E4-11 (IGT4) - E5-28 (E1) 0.1 to 4.5 V

    NG: REPLACE ECM 

    Fig 6: Identifying ECM Connector Terminal
    G05674035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  6. CHECK ECM (IGT1, IGT2, IGT3 OR IGT4 VOLTAGE) 
    1. Disconnect the I1, I2, I3 or I4 ignition coil and igniter connector.
    2. Measure the voltage between the applicable terminals of the E4 and E5 ECM connectors when the engine is cranked.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      E4-8 (IGT1) - E5-28 (E1) 4.5 V or more
      E4-9 (IGT2) - E5-28 (E1) 4.5 V or more
      E4-10 (IGT3) - E5-28 (E1) 4.5 V or more
      E4-11 (IGT4) - E5-28 (E1) 4.5 V or more
    3. Reconnect the ignition coil and igniter connector.

    NG: REPLACE ECM 

    Fig 7: Identifying ECM Connector Terminal
    G05674064Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  7. CHECK IGNITION COIL (POWER SOURCE) 
    1. Disconnect the I1, I2, I3 or I4 ignition coil and igniter connector.
    2. Turn the power switch ON (IG).
    3. Measure the voltage between the terminals of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      I1-1 (+B) - I1-4 (GND) 9 to 14 V
      I2-1 (+B) - I2-4 (GND) 9 to 14 V
      I3-1 (+B) - I3-4 (GND) 9 to 14 V
      I4-1 (+B) - I4-4 (GND) 9 to 14 V
    4. Reconnect the ignition coil and igniter connector.

    OK: REPLACE IGNITION COIL 

    Fig 8: Identifying Ignition Coil And Igniter Connector Terminal
    G05188733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (IGNITION COIL - IG2 RELAY) 
    1. Disconnect the I1, I2, I3 or I4 ignition coil and igniter connector.
      Fig 9: Identifying Ignition Coil And Igniter Connector Terminal
      G05188733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the integration relay from the engine room relay block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      I1-1 (+B) - 3I-4 (IG2 relay) Below 1 Ω
      I2-1 (+B) - 3I-4 (IG2 relay) Below 1 Ω
      I3-1 (+B) - 3I-4 (IG2 relay) Below 1 Ω
      I4-1 (+B) - 3I-4 (IG2 relay) Below 1 Ω
      I1-4 (GND) - Body ground Below 1 Ω
      I2-4 (GND) - Body ground Below 1 Ω
      I3-4 (GND) - Body ground Below 1 Ω
      I4-4 (GND) - Body ground Below 1 Ω
      Fig 10: Identifying Engine Room Relay Block
      G05188735Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      I1-1 (+B) or 3I-4 (IG2 relay) - Body ground 10 kΩ or higher
      I2-1 (+B) or 3I-4 (IG2 relay) - Body ground 10 kΩ or higher
      I3-1 (+B) or 3I-4 (IG2 relay) - Body ground 10 kΩ or higher
      I4-1 (+B) - 3I-4 (IG2 relay) - Body ground 10 kΩ or higher
    4. Reconnect the ignition coil and igniter connector.
    5. Reinstall the integration relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE IGNITION COIL 

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