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. INSPECT IGNITION COIL ASSEMBLY (GROUND CIRCUIT) 
   1. Disconnect the ignition coil assembly connectors.
   2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance (Check for Open) 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      B21-4 (GND) - Body ground	Always	Below 1 Ω
      B22-4 (GND) - Body ground	Always	Below 1 Ω
      B23-4 (GND) - Body ground	Always	Below 1 Ω
      B24-4 (GND) - Body ground	Always	Below 1 Ω

   3. Reconnect the ignition switch assembly connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) 

   Fig 1: Identifying Ignition Coil Assembly Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to Next Step 

2. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE) 
   1. Disconnect the ignition coil assembly connectors.
   2. Turn the ignition switch to ON.
   3. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      B21-1 (+B) - B21-4 (GND)	Ignition switch ON	11 to 14 V
      B22-1 (+B) - B22-4 (GND)	Ignition switch ON	11 to 14 V
      B23-1 (+B) - B23-4 (GND)	Ignition switch ON	11 to 14 V
      B24-1 (+B) - B24-4 (GND)	Ignition switch ON	11 to 14 V

   4. Reconnect the ignition coil assembly connectors.

   NG: Go to step  5

   Fig 2: Identifying Ignition Coil Assembly Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to Next Step 

3. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM) 
   1. Disconnect the ignition coil assembly connectors.
   2. Disconnect the ECM connector.
   3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance (Check for Open) 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      B21-2 (IGF) - B29-81 (IGF1)	Always	Below 1 Ω
      B22-2 (IGF) - B29-81 (IGF1)	Always	Below 1 Ω
      B23-2 (IGF) - B29-81 (IGF1)	Always	Below 1 Ω
      B24-2 (IGF) - B29-81 (IGF1)	Always	Below 1 Ω

      Standard Resistance (Check for Open) 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      B21-3 (IGT1) - B29-85 (IGT1)	Always	Below 1 Ω
      B22-3 (IGT2) - B29-84 (IGT2)	Always	Below 1 Ω
      B23-3 (IGT3) - B29-83 (IGT3)	Always	Below 1 Ω
      B24-3 (IGT4) - B29-82 (IGT4)	Always	Below 1 Ω

      Fig 3: Identifying ECM Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance (Check for Short) 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      B21-2 (IGF) or B29-81 (IGF1) - Body ground	Always	10 kΩ or higher
      B22-2 (IGF) or B29-81 (IGF1) - Body ground	Always	10 kΩ or higher
      B23-2 (IGF) or B29-81 (IGF1) - Body ground	Always	10 kΩ or higher
      B24-2 (IGF) or B29-81 (IGF1) - Body ground	Always	10 kΩ or higher

      Standard Resistance (Check for Short) 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      B21-3 (IGT1) or B29-85 (IGT1) - Body ground	Always	10 kΩ or higher
      B22-3 (IGT2) or B29-84 (IGT2) - Body ground	Always	10 kΩ or higher
      B23-3 (IGT3) or B29-83 (IGT3) - Body ground	Always	10 kΩ or higher
      B24-3 (IGT4) or B29-82 (IGT4) - Body ground	Always	10 kΩ or higher

   4. Reconnect the ECM connector.
   5. Reconnect the ignition coil assembly connectors.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - ECM) 

   OK: Go to Next Step 

4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the Techstream on.
   4. Clear the DTCs (See DTC CHECK / CLEAR ).
   5. Shuffle arrangement of the ignition coil with igniters (among No. 1 to No. 4 cylinders).
      NOTE: Do not shuffle the connectors.
   6. Perform a simulation test.
   7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   8. Read DTCs.

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   Same DTC is output	A
   Different ignition coil DTC is output	B

   B: REPLACE IGNITION COIL ASSEMBLY  (See IGNITION COIL AND SPARK PLUG )

   A: REPLACE ECM  (See ECM )

5. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - INTEGRATION RELAY) 
   1. Disconnect the ignition coil assembly connectors.
   2. Remove the integration relay from the engine room relay block.
   3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance (Check for Open) 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      B21-1 (+B) - 1A-4	Always	Below 1 Ω
      B22-1 (+B) - 1A-4	Always	Below 1 Ω
      B23-1 (+B) - 1A-4	Always	Below 1 Ω
      B24-1 (+B) - 1A-4	Always	Below 1 Ω

      Standard Resistance (Check for Short) 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      B21-1 (+B) or 1A-4-Body ground	Always	10 kΩ or higher
      B22-1 (+B) or 1A-4 -Body ground	Always	10 kΩ or higher
      B23-1 (+B) or 1A-4 -Body ground	Always	10 kΩ or higher
      B24-1 (+B) or 1A-4 -Body ground	Always	10 kΩ or higher

   4. Reinstall the integration relay.
   5. Reconnect the ignition coil assembly connectors.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY INTEGRATION RELAY) 

Fig 4: Identifying Engine Room Relay Block

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT  (See ECM POWER SOURCE CIRCUIT )