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Home >> Lexus >> 2006 >> SC 430 >> Repair and Diagnosis >> Engine Performance >> System >> SFI System - Diagnostics >> DTC P0351, P0352, P0353, P0354, P0355, P0356, P0357, P0358: Ignition Coil "A"/"B"/"C"/"D"/"E"/"F"/"G"/"H" Primary/Secondary Circuit >> Inspection Procedure

Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester. 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. INSPECT SPARK PLUG 
    1. Remove the engine cover.
    2. Remove the ignition coil and the spark plug of misfire cylinder.
    3. Measure the spark plug electrode gap.

      Standard: 

      The electrode gap is 1.0 to 1.3 mm (0.039 to 0.051 in.) 

    4. Check the electrode for carbon deposits.

      Recommended: 

      SPARK PLUG SPECIFICATIONS

      Manufacturer Spark Plug Type
      DENSO SK20R11
      NGK IFR6A11
      NOTE: If the electrode gap is larger than the standard, replace the spark plug. Do not adjust the electrode gap.
      Fig 1: Measuring Spark Plug Electrode Gap
      G02955534Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE SPARK PLUG 
    2. OK: Go to next step. 
  2. CHECK SPARK AND IGNITION 
    1. Disconnect the injector connectors to prevent the engine starting.
    2. Install the spark plug to the ignition coil.
    3. Attach the spark plug to the cylinder head cover.
    4. Crank the engine within 2 seconds and check the spark.

      OK: Spark occurs 

      Fig 2: Checking Spark & Ignition
      G02955535Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Go to step   5 . 
    2. OK: Go to next step. 
  3. CHECK WIRE HARNESS (IGNITION COIL - ECM) 
    1. Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.
    2. Disconnect the E4 ECM connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard: 

      RESISTANCE SPECIFICATIONS

      Tester Connection Specified Condition
      I1-2 - E4-6 (IF1L) Below 1 ohms
      I2-2 - E4-5 (IF2R) Below 1 ohms
      I3-2 - E4-4 (IF2L) Below 1 ohms
      I4-2 - E4-7 (IF1R) Below 1 ohms
      I5-2 - E4-4 (IF2L) Below 1 ohms
      I6-2 - E4-7 (IF1R) Below 1 ohms
      I7-2 - E4-6 (IF1L) Below 1 ohms
      I8-2 - E4-5 (IF2R) Below 1 ohms
      I1-2 or E4-6 (IF1L) - Body ground 10 k ohms or higher
      I2-2 or E4-5 (IF2R) - Body ground 10 k ohms or higher
      I3-2 or E4-4 (IF2L) - Body ground 10 k ohms or higher
      I4-2 or E4-7 (IF1R) - Body ground 10 k ohms or higher
      I5-2 or E4-4 (IF2L) - Body ground 10 k ohms or higher
      I6-2 or E4-7 (IF1R) - Body ground 10 k ohms or higher
      I7-2 or E4-6 (IF1L) - Body ground 10 k ohms or higher
      I8-2 or E4-5 (IF2R) - Body ground 10 k ohms or higher
      Fig 3: Identifying Ignition Coil Connector Terminals
      G02955536Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: Go to next step. 
  4. CHECK ECM (IF1L, IF2L, IF1R, IF2R VOLTAGE) 
    1. Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.
    2. Turn the ignition switch ON.
    3. Measure the voltage of the ECM connectors.

      Standard: 

      RESISTANCE SPECIFICATIONS

      Tester Connection Specified Condition
      E4-6 (IF1L) - E3-7 (E1) 4.5 to 5.5 V
      E4-4 (IF2L) - E3-7 (E1) 4.5 to 5.5 V
      E4-7 (IF1R) - E3-7 (E1) 4.5 to 5.5 V
      E4-5 (IF2R) - E3-7 (E1) 4.5 to 5.5 V
      Fig 4: Identifying Ignition Coil & ECM Connector Terminals
      G02955537Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE ECM (See  REPLACEMENT  ) 
    2. OK: REPLACE IGNITION COIL ASSY (see  IGNITION COIL  ) 
  5. CHECK WIRE HARNESS (IGNITION COIL - ECM) 
    1. Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.
    2. Disconnect the E2 and E4 ECM connectors.
    3. Measure the resistance of the wire harness side connectors.

      Standard: 

      RESISTANCE SPECIFICATIONS

      Tester Connection Specified Condition
      I1-3 - E2-17 (IGT1) Below 1 ohms
      I2-3 - E4-13 (IGT2) Below 1 ohms
      I3-3 - E2-16 (IGT3) Below 1 ohms
      I4-3 - E4-12 (IGT4) Below 1 ohms
      I5-3 - E2-27 (IGT5) Below 1 ohms
      I6-3 - E4-11 (IGT6) Below 1 ohms
      I7-3 - E2-26 (IGT7) Below 1 ohms
      I8-3 - E4-10 (IGT8) Below 1 ohms
      I1-3 or E2-17 (IGT1) - Body ground 10 k ohms or higher
      I2-3 or E4-13 (IGT2) - Body ground 10 k ohms or higher
      I3-3 or E2-16 (IGT3) - Body ground 10 k ohms or higher
      I4-3 or E4-12 (IGT4) - Body ground 10 k ohms or higher
      I5-3 or E2-27 (IGT5) - Body ground 10 k ohms or higher
      I6-3 or E4-11 (IGT6) - Body ground 10 k ohms or higher
      I7-3 or E2-26 (IGT7) - Body ground 10 k ohms or higher
      I8-3 or E4-10 (IGT8) - Body ground 10 k ohms or higher
      Fig 5: Identifying I1, I2, I3, I4, I5, I6, I7 & I8 Ignition Coil Connector Terminals
      G02955538Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: Go to next step. 
  6. CHECK ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7, IGT8 VOLTAGE) 
    1. Measure the voltage of the ECM connectors when the engine is cranked.

      Standard: 

      RESISTANCE SPECIFICATIONS

      Tester Connection Specified Condition
      E2-17 (IGT1) - E3-7 (E1) 0.1 to 4.5 V
      E4-13 (IGT2) - E3-7 (E1) 0.1 to 4.5 V
      E2-16 (IGT3) - E3-7 (E1) 0.1 to 4.5 V
      E4-12 (IGT4) - E3-7 (E1) 0.1 to 4.5 V
      E2-27 (IGT5) - E3-7 (E1) 0.1 to 4.5 V
      E4-11 (IGT6) - E3-7 (E1) 0.1 to 4.5 V
      E2-26 (IGT7) - E3-7 (E1) 0.1 to 4.5 V
      E4-10 (IGT8) - E3-7 (E1) 0.1 to 4.5 V
      Fig 6: Identifying IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7, IGT8 Terminals
      G02955539Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE ECM (See  REPLACEMENT  ) 
    2. OK: Go to next step. 
  7. CHECK WIRE HARNESS (POWER SOURCE) 
    1. Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.
    2. Turn the ignition switch from ON to START.
    3. Measure the voltage of the wire harness side connector.

      Standard: 

      RESISTANCE SPECIFICATIONS

      Tester Connection Specified Condition
      I1-1 - Body ground 9 to 14 V
      I2-1 - Body ground 9 to 14 V
      I3-1 - Body ground 9 to 14 V
      I4-1 - Body ground 9 to 14 V
      I5-1 - Body ground 9 to 14 V
      I6-1 - Body ground 9 to 14 V
      I7-1 - Body ground 9 to 14 V
      I8-1 - Body ground 9 to 14 V
      Fig 7: Identifying Ignition Coil Connectors Terminals
      G02955540Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE IGNITION COIL ASSY (See  IGNITION COIL  ) 
    2. NG: Go to next step. 
  8. INSPECT FUSE (INJ) 
    1. Remove the INJ fuse from the engine room No. 2 R/B.
    2. Measure the resistance of the INJ fuse.

      Standard: Below 1 Ω 

      Fig 8: Identifying INJ Fuse Location
      G02955541Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE FUSE 
    2. OK: Go to next step. 
  9. CHECK WIRE HARNESS (IGNITION COIL - IG2 RELAY) 
    1. Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.
    2. Remove the IG2 relay from the engine room No. 1 R/B.
    3. Measure the resistance of the wire harness side connectors.

      Standard: 

      RESISTANCE SPECIFICATIONS

      Tester Connection Specified Condition
      I1-1 - R/B IG2 relay terminal 3 Below 1 ohms
      I2-1 - R/B IG2 relay terminal 3 Below 1 ohms
      I3-1 - R/B IG2 relay terminal 3 Below 1 ohms
      I4-1 - R/B IG2 relay terminal 3 Below 1 ohms
      I5-1 - R/B IG2 relay terminal 3 Below 1 ohms
      I6-1 - R/B IG2 relay terminal 3 Below 1 ohms
      I7-1 - R/B IG2 relay terminal 3 Below 1 ohms
      I8-1 - R/B IG2 relay terminal 3 Below 1 ohms
      I1-1 or R/B IG2 relay terminal 3 - Body ground 10 k ohms or higher
      I2-1 or R/B IG2 relay terminal 3 - Body ground 10 k ohms or higher
      I3-1 or R/B IG2 relay terminal 3 - Body ground 10 k ohms or higher
      I4-1 or R/B IG2 relay terminal 3 - Body ground 10 k ohms or higher
      I5-1 or R/B IG2 relay terminal 3 - Body ground 10 k ohms or higher
      I6-1 or R/B IG2 relay terminal 3 - Body ground 10 k ohms or higher
      I7-1 or R/B IG2 relay terminal 3 - Body ground 10 k ohms or higher
      I8-1 or R/B IG2 relay terminal 3 - Body ground 10 k ohms or higher
      Fig 9: Identifying IG2 Relay
      G02955542Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE IGNITION COIL ASSY (See  IGNITION COIL  ) 
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