Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. 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. PERFORM SIMULATION TEST 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch to the ON position.
   3. Turn the tester on.
   4. Clear the DTCs (See DTC CHECK / CLEAR  ).
   5. Shuffle arrangement of the ignition coils with igniters (among No. 1 to No. 4 cylinders).
      NOTE: Do not shuffle the connectors.
   6. Perform a simulation test.
   7. Check the DTCs displayed on the tester.

      Result 

      DTC RESULT REFERENCE
      
      

      Display (DTC Output)	Proceed to
      Same DTCs (that have been erased)	A
      Other DTCs	B

   B: REPLACE IGNITION COIL ASSEMBLY 

   A: GO TO NEXT STEP 

2. INSPECT ECM (IGT1, IGT2, IGT3, IGT4 AND IGF1 SIGNAL) 
   1. While cranking or idling, check the waveform of the ECM connectors using an oscilloscope.

      OK 

      ECM TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      IGT1 (E8-17) - E1 (E8-3)	Correct waveform appears as shown
      IGT2 (E8-16) - E1 (E8-3)	Correct waveform appears as shown
      IGT3 (E8-15) - E1 (E8-3)	Correct waveform appears as shown
      IGT4 (E8-14) - E1 (E8-3)	Correct waveform appears as shown
      IGF1 (E8-23) - E1 (E8-3)	Correct waveform appears as shown

   NG: REPLACE ECM 

   Fig 1: Inspecting ECM (IGT1, IGT2, IGT3, IGT4 And IGF1 Signal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: GO TO NEXT STEP 

3. CHECK WIRE HARNESS (IGNITION COIL ASSEMBLY - ECM) 
   1. Disconnect the 11,12,13 or 14 ignition coil with igniter connector.
   2. Disconnect the E8 ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      WIRE HARNESS TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      IGF (11-2) - IGF1 (E8-23)	Below 1 Ω
      IGF (12-2) - IGF1 (E8-23)	Below 1 Ω
      IGF (I3-2) - IGF1 (E8-23)	Below 1 Ω
      IGF (I4-2) - IGF1 (E8-23)	Below 1 Ω
      IGT (11-3) - IGT1(E8-17)	Below 1 Ω
      IGT (I2-3) - IGT2 (E8-16)	Below 1 Ω
      IGT(l3-3) - IGT3(E8-15)	Below 1 Ω
      IGT (I4-3) - IGT4 (E8-14)	Below 1 Ω
      IGF (11-2) or IGF1 (E8-23) - Body ground	Below 1 Ω
      IGF (12-2) or IGF1 (E8-23) - Body ground	Below 1 Ω
      IGF (I3-2) or IGF1 (E8-23) - Body ground	Below 1 Ω
      IGF (I4-2) or IGF1 (E8-23) - Body ground	Below 1 Ω
      IGT (11-3) or IGT1 (E8-17) - Body ground	Below 1 Ω
      IGT (I2-3) or IGT2 (E8-16) - Body ground	Below 1 Ω
      IGT (I3-3) or IGT3 (E8-15) - Body ground	Below 1 Ω
      IGT (I4-3) or IGT4 (E8-14) - Body ground	Below 1 Ω

      Fig 2: Disconnecting E8 ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: GO TO NEXT STEP 

4. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE) 
   1. Disconnect the 11,12,13 or 14 ignition coil connector.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      IGNITION COIL ASSEMBLY TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      GND (11-4) -Body ground	Below 1 Ω
      GND (I2-4) - Body ground	Below 1 Ω
      GND (13-4) - Body ground	Below 1 Ω
      GND (14-4) - Body ground	Below 1 Ω

   3. Turn the ignition switch to the ON position.
   4. Measure the voltage according to the value(s) in the table below.
      Fig 3: Identifying Ignition Coil Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      IGNITION COIL ASSEMBLY TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      +B (11-1) - GND (11-4)	Between 9 V and 14 V
      +B(l2-1) - GND(l2-4)	Between 9 V and 14 V
      +B (13-1) - GND (I3-4)	Between 9 V and 14 V
      +B (14-1) - GND (I4-4)	Between 9 V and 14 V

   5. Reconnect the ignition coil connector.

   NG: Go to step 5 

   OK: REPLACE IGNITION COIL ASSEMBLY 

5. CHECK WIRE HARNESS (IGNITION COIL ASSEMBLY - IG2 RELAY) 
   1. Disconnect the 11, 12,13 or 14 ignition coil with igniter connector.
   2. Remove the IG2 relay from the engine room relay block.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      WIRE HARNESS TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      +B (11-1) - Engine room relay block (IG2 relay terminal 3)	Below 1 Ω
      +B (12-1) - Engine room relay block (IG2 relay terminal 3)	Below 1 Ω
      +B (13-1) - Engine room relay block (IG2 relay terminal 3)	Below 1 Ω
      +B (14-1) - Engine room relay block (IG2 relay terminal 3)	Below 1 Ω
      +B (11-1) or Engine room relay block (IG2 relay terminal 3) - Body ground	10 kΩ or higher
      +B (12-1) or Engine room relay block (IG2 relay terminal 3) - Body ground	10 kΩ or higher
      +B (13-1) or Engine room relay block (IG2 relay terminal 3) - Body ground	10 kΩ or higher
      +B (14-1) or Engine room relay block (IG2 relay terminal 3) - Body ground	10 kΩ or higher

      Fig 4: Identifying IG2 Relay Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE IGNITION COIL ASSEMBLY