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: Wiring Diagram

Fig 1: Ignition Coil - Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are 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. PERFORM SIMULATION TEST 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch ON.
   3. Turn the tester ON.
   4. Clear 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 DTCs displayed on the tester.

   Result 

   RESULT CHART
   
   

   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 : Go to next step 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   IGT1 (E8-8) - E1 (E6-1)	Correct waveform is as shown
   IGT2 (E8-9) - E1 (E6-1)	Correct waveform is as shown
   IGT3 (E8-10) - E1 (E6-1)	Correct waveform is as shown
   IGT4 (E8-11) - E1 (E6-1)	Correct waveform is as shown
   IGF1 (E8-24) - E1 (E6-1)	Correct waveform is as shown

   NG : REPLACE ECM 

   Fig 2: Inspecting ECM Connector (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 of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   IGF (I1-2) - IGF1 (E8-24)	Below 1 Ω
   IGF (I2-2) - IGF1 (E8-24)	Below 1 Ω
   IGF (I3-2) - IGF1 (E8-24)	Below 1 Ω
   IGF (I4-2) - IGF1 (E8-24)	Below 1 Ω
   IGT (I1-3) - IGT1 (E8-8)	Below 1 Ω
   IGT (I2-3) - IGT2 (E8-9)	Below 1 Ω
   IGT (I3-3) - IGT3 (E8-10)	Below 1 Ω
   IGT (I4-3) - IGT4 (E8-11)	Below 1 Ω
   IGF (I1-2) or IGF1 (E8-24) - Body ground	Below 1 Ω
   IGF (I2-2) or IGF1 (E8-24) - Body ground	Below 1 Ω
   IGF (I3-2) or IGF1 (E8-24) - Body ground	Below 1 Ω
   IGF (I4-2) or IGF1 (E8-24) - Body ground	Below 1 Ω
   IGT (I1-3) or IGT1 (E8-8) - Body ground	Below 1 Ω
   IGT (I2-3) or IGT2 (E8-9) - Body ground	Below 1 Ω
   IGT (I3-3) or IGT3 (E8-10) - Body ground	Below 1 Ω
   IGT (I4-3) or IGT4 (E8-11) - Body ground	Below 1 Ω

   NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

   Fig 3: Disconnecting E8 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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 of the wire harness side connector.

      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

   3. Turn the ignition switch ON.
   4. Measure the voltage of the wire harness side connector.

      Standard voltage 

      Fig 4: Identifying I1, I2, I3 Or I4 Ignition Coil Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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 

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 of the wire harness side connectors.

   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

   NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

   Fig 5: Identifying I1, I2, I3 Or I4 Ignition Coil With Igniter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPLACE IGNITION COIL ASSEMBLY