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 the misfire cylinder.
   3. Measure the spark plug's electrode gap.

      Standard: 

      Electrode gap: 1.0 to 1.3 mm (0.039 to 0.051 in.) 

   4. Check the electrode for carbon deposits.
      Fig 1: Measuring Spark Plug Electrode Gap

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Recommended: 

   SPARK PLUG SPECIFICATION TABLE
   
   

   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.

   NG: REPLACE SPARK PLUG 

   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 And Ignition

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step   5 

   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.
   Fig 3: Disconnecting E4 ECM Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   IGNITION COIL - ECM - RESISTANCE TABLE
   
   

   Tester Connection	Specified Condition
   I1-2 - E4-7 (IGF1)	Below 1 Ω
   I2-2 - E4-6 (IGF2)	Below 1 Ω
   I3-2 - E4-6 (IGF2)	Below 1 Ω
   I4-2 - E4-7 (IGF1)	Below 1 Ω
   I5-2 - E4-6 (IGF2)	Below 1 Ω
   I6-2 - E4-7 (IGF1)	Below 1 Ω
   I7-2 - E4-7 (IGF1)	Below 1 Ω
   I8-2 - E4-6 (IGF2)	Below 1 Ω
   I1-2 or E4-7 (IGF1) - Body ground	10 kΩ or higher
   I2-2 or E4-6 (IGF2) - Body ground	10 kΩ or higher
   I3-2 or E4-6 (IGF2) - Body ground	10 kΩ or higher
   I4-2 or E4-7 (IGF1) - Body ground	10 kΩ or higher
   I5-2 or E4-6 (IGF2) - Body ground	10 kΩ or higher
   I6-2 or E4-7 (IGF1) - Body ground	10 kΩ or higher
   I7-2 or E4-7 (IGF1) - Body ground	10 kΩ or higher
   I8-2 or E4-6 (IGF2) - Body ground	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: Go to next step 

4. CHECK ECM (IGF1, IGF2 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 connector.
   Fig 4: Identifying ECM Connector Terminals
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   ECM CONNECTOR - VOLTAGE TABLE
   
   

   Tester Connection	Specified Condition
   E4-7 (IGF1) - E6-7 (E1)	4.5 to 5.5 V
   E4-6 (IGF2) - E6-7 (E1)	4.5 to 5.5 V

   NG: REPLACE ECM (See  REPLACEMENT  ) 

   OK: REPLACE IGNITION COIL ASSY (See step 5 on  REPLACEMENT  ) 

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 E4 ECM and E5 connector.
   3. Measure the resistance of the wire harness side connectors.
   Fig 5: Disconnecting E4 ECM And E5 Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   IGNITION COIL - ECM - RESISTANCE TABLE
   
   

   Tester Connection	Specified Condition
   I1-3 - E5-17 (IGT1)	Below 1 Ω
   I2-3 - E4-13 (IGT2)	Below 1 Ω
   I3-3 - E5-16 (IGT3)	Below 1 Ω
   I4-3 - E4-12 (IGT4)	Below 1 Ω
   I5-3 - E5-27 (IGT5)	Below 1 Ω
   I6-3 - E4-11 (IGT6)	Below 1 Ω
   I7-3 - E5-26 (IGT7)	Below 1 Ω
   I8-3 - E4-10 (IGT8)	Below 1 Ω
   I1-3 or E5-17 (IGT1) - Body ground	10 kΩ or higher
   I2-3 or E4-13 (IGT2) - Body ground	10 kΩ or higher
   I3-3 or E5-16 (IGT3) - Body ground	10 kΩ or higher
   I4-3 or E4-12 (IGT4) - Body ground	10 kΩ or higher
   I5-3 or E5-27 (IGT5) - Body ground	10 kΩ or higher
   I6-3 or E4-11 (IGT6) - Body ground	10 kΩ or higher
   I7-3 or E5-26 (IGT7) - Body ground	10 kΩ or higher
   I8-3 or E4-10 (IGT8) - Body ground	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: Go to next step 

6. CHECK ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7, IGT8 VOLTAGE) 
   1. Measure the voltage of the ECM connector when the engine is cranked.
   Fig 6: Identifying ECM Connector Terminals
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   ECM CONNECTOR - VOLTAGE TABLE
   
   

   Tester Connection	Specified Condition
   E5-17 (IGT1) - E6-7 (E1)	0.1 to 4.5V
   E4-13 (IGT2) - E6-7 (E1)	0.1 to 4.5V
   E5-16 (IGT3) - E6-7 (E1)	0.1 to 4.5V
   E4-12 (IGT4) - E6-7 (E1)	0.1 to 4.5V
   E5-27 (IGT5) - E6-7 (E1)	0.1 to 4.5V
   E4-11 (IGT6) - E6-7 (E1)	0.1 to 4.5V
   E5-26 (IGT7) - E6-7 (E1)	0.1 to 4.5V
   E4-10 (IGT8) - E6-7 (E1)	0.1 to 4.5V

   NG: REPLACE ECM (See  REPLACEMENT  ) 

   OK: Go to next step 

7. CHECK IGNITION COIL ASSY (POWER SOURCE) 
   1. Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.
   2. Turn the ignition switch ON and START position.
   3. Measure the voltage of the wire harness side connector.
   Fig 7: Checking Ignition Coil Assy
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   IGNITION COIL ASSY - VOLTAGE TABLE
   
   

   Tester Connection	Specified Condition
   I1-1 - Body ground	9 to 14V
   I2-1 - Body ground	9 to 14V
   I3-1 - Body ground	9 to 14V
   I4-1 - Body ground	9 to 14V
   I5-1 - Body ground	9 to 14V
   I6-1 - Body ground	9 to 14V
   I7-1 - Body ground	9 to 14V
   I8-1 - Body ground	9 to 14V

   OK: REPLACE IGNITION COIL ASSY (See step 5 on  REPLACEMENT  ) 

   NG: Go to next step 

8. CHECK WIRE HARNESS (IGNITION COIL - IG2 RELAY) 
   1. Inspect the INJ fuse.
      1. Remove the INJ fuse from the engine room No. 1 R/B.
      2. Measure the resistance of the INJ fuse.

      Standard: Below 1 Ω 

   2. Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connectors.
   3. Remove the IG2 relay from the engine room No. 1 R/B.
   4. Measure the resistance of the wire harness side connectors.
   Fig 8: Identifying INJ Fuse And IG2 Relay
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   IGNITION COIL - IG2 RELAY - RESISTANCE TABLE
   
   

   Tester Connection	Specified Condition
   I1-1 - R/B IG2 relay terminal 3	Below 1 Ω
   I2-1 - R/B IG2 relay terminal 3	Below 1 Ω
   I3-1 - R/B IG2 relay terminal 3	Below 1 Ω
   I4-1 - R/B IG2 relay terminal 3	Below 1 Ω
   I5-1 - R/B IG2 relay terminal 3	Below 1 Ω
   I6-1 - R/B IG2 relay terminal 3	Below 1 Ω
   I7-1 - R/B IG2 relay terminal 3	Below 1 Ω
   I8-1 - R/B IG2 relay terminal 3	Below 1 Ω
   I1-1 or R/B IG2 relay terminal 3 - Body ground	10 kΩ or higher
   I2-1 or R/B IG2 relay terminal 3 - Body ground	10 kΩ or higher
   I3-1 or R/B IG2 relay terminal 3 - Body ground	10 kΩ or higher
   I4-1 or R/B IG2 relay terminal 3 - Body ground	10 kΩ or higher
   I5-1 or R/B IG2 relay terminal 3 - Body ground	10 kΩ or higher
   I6-1 or R/B IG2 relay terminal 3 - Body ground	10 kΩ or higher
   I7-1 or R/B IG2 relay terminal 3 - Body ground	10 kΩ or higher
   I8-1 or R/B IG2 relay terminal 3 - Body ground	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: REPLACE IGNITION COIL ASSY (See step 5 on  REPLACEMENT  )