Inspection Procedure

HINT:

Read freeze frame data using the 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. PERFORM SIMULATION TEST 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to the ON position.
   3. Turn the Techstream on.
   4. Clear the DTCs (See DTC CHECK/CLEAR  ).
   5. Rearrange 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 Techstream.

      Result 

      RESULT CHART
      
      

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

   B: REPLACE IGNITION COIL ASSEMBLY  (See REMOVAL )

   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 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   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  (See REMOVAL )

   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 I1, I2, I3 or I4 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 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      IGF (I1-2) - IGF1 (E8-23)	Below 1 Ω
      IGF (I2-2) - 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 (I1-3) - IGT1 (E8-17)	Below 1 Ω
      IGT (I2-3) - IGT2 (E8-16)	Below 1 Ω
      IGT (I3-3) - IGT3 (E8-15)	Below 1 Ω
      IGT (I4-3) - IGT4 (E8-14)	Below 1 Ω
      IGF (I1-2) or IGF1 (E8-23) - Body ground	Below 1 Ω
      IGF (I2-2) 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 (I1-3) 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: Checking Wire Harness (Ignition Coil Assembly - ECM)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Reconnect the ignition coil with igniter connector.
   5. Reconnect the ECM connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

4. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE) 
   1. Disconnect the I1, I2, I3 or I4 ignition coil connector.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      GND (I1-4) - Body ground	Below 1 Ω
      GND (I2-4) - Body ground	Below 1 Ω
      GND (I3-4) - Body ground	Below 1 Ω
      GND (I4-4) - Body ground	Below 1 Ω

      Fig 3: Inspecting Ignition Coil Assembly (Power Source)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Turn the ignition switch to the ON position.
   4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      +B (I1-1) - GND (I1-4)	Between 9 V and 14 V
      +B (I2-1) - GND (I2-4)	Between 9 V and 14 V
      +B (I3-1) - GND (I3-4)	Between 9 V and 14 V
      +B (I4-1) - 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  (See REMOVAL )

5. CHECK WIRE HARNESS (IGNITION COIL ASSEMBLY - IG2 RELAY) 
   1. Disconnect the I1, I2, I3 or I4 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 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      +B (I1-1) - Engine room relay block (IG2 relay terminal 3)	Below 1 Ω
      +B (I2-1) - Engine room relay block (IG2 relay terminal 3)	Below 1 Ω
      +B (I3-1) - Engine room relay block (IG2 relay terminal 3)	Below 1 Ω
      +B (I4-1) - Engine room relay block (IG2 relay terminal 3)	Below 1 Ω
      +B (I1-1) or Engine room relay block (IG2 relay terminal 3) - Body ground	10 kΩ or higher
      +B (I2-1) or Engine room relay block (IG2 relay terminal 3) - Body ground	10 kΩ or higher
      +B (I3-1) or Engine room relay block (IG2 relay terminal 3) - Body ground	10 kΩ or higher
      +B (I4-1) or Engine room relay block (IG2 relay terminal 3) - Body ground	10 kΩ or higher

      Fig 4: Checking Wire Harness (Ignition Coil Assembly - IG2 Relay)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Reconnect the ignition coil with igniter connector.
   5. Reinstall the IG2 relay.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE IGNITION COIL ASSEMBLY  (See REMOVAL )