Inspection Procedure

HINT:

The diagnostic information output from the Air Injection Control Driver (AID) can be confirmed by connecting an oscilloscope to the diagnostic information terminal of the AID. A trouble area search can be narrowed by reading the waveform on the oscilloscope when performing the AIR system intrusive operation function provided in the SYSTEM CHECK.

1. Start the engine and warm it up.
2. Turn the ignition switch OFF.
3. Connect the intelligent tester to the DLC3 with CAN VIM.
4. 4 Connect an oscilloscope probe to the AIDI terminal of the ECM.
   Fig 1: Identifying ECM Connector Terminal

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
5. Start the engine and turn the tester ON.
6. On the tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ SYSTEM.
7. On the tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL OPERATION / OPERATION 1 and 2.
   Fig 2: Identifying Monitor Screen Display - AIR INJ CHECK

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   HINT:

   OPERATION 1: AP: OFF; EASV: CLOSE; ASV1: CLOSE; ASV2: OFF

   OPERATION 2: AP: ON; EASV: OPEN; ASV1: OPEN; ASV2: OPEN

8. Monitor the voltage output of the AID (duty ratio signal).

Oscilloscope range: 

Item	Content
Terminal	CH1: AIDI - E1
Equipment Setting	5 V/DIV., 20 to 40 msec./DIV.
Condition	Idling

AID Diagnostic Signal Waveform	ECM Command	DTC (ECM Output)	Suspected Trouble Area
100% Duty Ratio See  1 waveform 1	Any Air Injection (AIR) System operation	P1613	Open in diagnostic signal circuit Air Injection Control Driver (AID) Open in AID +B circuit (AID power source) Short between +B circuit and diagnostic signal circuit
0% Duty Ratio See  2 waveform 2	AIR System: ON (Air pump ON, ASV ON)	P1613	Open or short in air pump or Air Switching Valve (ASV) command signal circuit (ECM - AID) Open in AID ground circuit Short between diagnostic signal circuit and body ground AID ECM
	AIR System: OFF (Air pump OFF, ASV OFF)	-	Normal
20% Duty Ratio See  3 waveform 3	Air Pump: ON	P0418	Short between air pump drive circuit and body ground Harness & connector (AID - Pump) Air Pump AID ECM
	Air Pump: OFF	P0418	Open in air pump drive circuit (AID - Pump), or short between air pump drive circuit and +B Harness & connector (AID - Pump) Air Pump AID ECM
40% Duty Ratio See  4 waveform 4	ASV: ON	P0412	Short between ASV drive circuit and body ground Harness & connector (AID - ASV) ASV AID ECM
	ASV: OFF	P0412	Open in ASV drive circuit (AID - ASV), or short between ASV drive circuit and +B Harness & connector (AID - ASV) AID ASV ECM
80% Duty Ratio See  5 waveform 5	AIR System: OFF (Air pump OFF, ASV OFF)	P1613	AID ECM
	AIR System: ON (Air pump ON, ASV ON)	-	Normal
Excluding Above (excluding 0, 20, 40, 80, 100% duty)	-	P1613	AID Open in AID ground circuit

1. Waveform 1 

   100% Duty Ratio

   Fig 4: Identifying Duty Ratio Waveform 1

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Waveform 2 

   0% Duty Ratio

   Fig 5: Identifying Duty Ratio Waveform 2

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. Waveform 3 

   20% Duty Ratio

   Fig 6: Identifying Duty Ratio Waveform 3

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4. Waveform 4 

   40% Duty Ratio

   Fig 7: Identifying Duty Ratio Waveform 4

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
5. Waveform 5 

   80% Duty Ratio

   Fig 8: Identifying Duty Ratio Waveform 5

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

• Using the AIR INJ CHECK operation of the SYSTEM CHECK provided in the intelligent tester function, conditions for air fuel ratio and pressure in the secondary air injection system passage can be checked while the secondary air injection system is operating. It helps technicians to troubleshoot the system when it is malfunctioning.
• 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. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1613) 
   1. Connect the intelligent tester to the DLC3 with CAN VIM.
   2. Turn the ignition switch ON and turn the tester ON.
   3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
   4. Read the DTCs.

      Result 

      RESULT REFERENCE
      
      

      Display (DTC Output)	Proceed to
      P1613	A
      P1613 and other DTCs	B

      HINT:

      If any DTCs other than P1613 are output, troubleshoot those DTCs first.

   B: GO TO  DTC TABLE 

   A: Go to next step 

2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (AIDI VOLTAGE) 
   1. Start the engine and warm it up.
   2. Turn the ignition switch OFF.
   3. Connect the intelligent tester to the DLC3 with CAN VIM.
   4. Turn the ignition switch ON and turn the tester ON.
   5. Start the engine.
   6. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / AUTOMATIC OPERATION.
      NOTE:

      • When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
      • Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.
   7. Measure the voltage between AIDI terminal of the ECM connector and body ground when the air injection system is ON and OFF.
   Fig 9: Identifying E9 Connector Terminal

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   Result 

   RESULT REFERENCE
   
   

   Results	Suspected Trouble Areas	Proceed to
   Fixed at Low (1.6 V or less) even when AIR system ON (Air pump ON, ASV ON)	Short between air pump or air switching valve command signal circuit and body ground Open in air pump command signal circuit (between ECM and AID) Open in ASV command signal circuit (between ECM and AID) Open in AID ground circuit (between AID and body ground) Diagnostic signal circuit ground short AID ECM	A
   Fixed at High (12 V or more) even when AIR system OFF (Air pump OFF, ASV OFF)	Open in diagnostic signal circuit (ECM - AID) Short between +B circuit and diagnostic signal circuit (ECM - AID) Open in AID power source circuit AID ECM	B
   Other than above: Fluctuating (duty signal excluding 20, 40, 80%)	AID Open in AID ground circuit (between AID and body ground)	C

   B:  Go to step  5

   C:  Go to step  8

   A: Go to next step 

3. INSPECT ECM (AIRP AND AIRV VOLTAGE) 
   1. Turn the ignition switch ON.
   Fig 10: Identifying Connector Terminal E9-25 (AIRP), E9-4 (AIRV) Of ECM Connector
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   2. Measure the voltage between terminal E9-25 (AIRP), E9-4 (AIRV) of the ECM connector and body ground.

      Standard voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      AIRP (E9-25) - Body ground	10 V or more
      AIRV (E9-4) - Body ground	10 V or more

   NG: REPLACE ECM 

   OK: Go to next step 

4. CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION CONTROL DRIVER, AIR INJECTION CONTROL DRIVER - BODY GROUND) 
   Fig 11: Identifying A44 Air Injection Driver Connector Terminals

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   1. Disconnect the A44 air injection driver connector.
   2. Disconnect the E9 ECM connector.
   3. Measure the resistance between the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      SIP (A44-4) or AIRP (E9-25) - Body ground	10 kΩ or higher
      SIV (A44-3) or AIRV (E9-4) - Body ground	10 kΩ or higher
      E (A44-1) - Body ground	Below 1 Ω

   4. Measure the voltage between terminals Dl (A44-2) and E (A44-1) of the air injection driver wire harness side connectors.

      Standard voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      DI (A44-2) - E (A44-1)	9 V or more

   5. Reconnect the air injection driver connector.
   6. Reconnect the ECM connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE AIR INJECTION CONTROL DRIVER 

5. CHECK POWER SOURCE OF AIR INJECTION CONTROL DRIVER 
   Fig 12: Identifying A44 Air Injection Control Driver (AID) Connector Terminal

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   1. Disconnect the A44 Air Injection Control Driver (AID) connector.
   2. Turn the ignition switch ON.
   3. Measure the voltage between the terminal +B (A44-5) and E (A44-1) of the AID connector.

      Standard voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      +B (A44-5) - E (A44-1)	10 V or more

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

6. INSPECT AIR INJECTION CONTROL DRIVER (Dl TERMINAL VOLTAGE) 
   1. Disconnect the A44 AID connector.
   2. Turn the ignition switch ON.
   Fig 13: Identifying A44 AID Connector Terminal
   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   3. Measure the voltage between the terminal A44-2 (Dl) of the AID connector and body ground.

      Standard voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      DI (A44-2) - Body ground	10 V or more

   4. Reconnect the AID connector.

   OK: REPLACE AIR INJECTION CONTROL DRIVER 

   NG: Go to next step 

7. CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION CONTROL DRIVER) 
   1. Disconnect the A44 air injection driver connector.
      Fig 14: Identifying A44 Air Injection Driver Connector Terminal

      Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   2. Disconnect the E9 ECM connector.
   3. Check the resistance between the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      DI (A44-2) - AIDI (E9-13)	Below 1 Ω
      DI (A44-2) or AIDI (E9-13) - +B (A44-5)	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM 

8. CHECK HARNESS AND CONNECTOR (AIR INJECTION DRIVER - BODY GROUND) 
   Fig 15: Identifying A44 AID Connector Terminal

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
   1. Disconnect the A44 AID connector.
   2. Measure the resistance between the terminal E (A44-1) of the AID connector and body ground.

      Standard resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      E (A44-1) - Body ground	Below 1 Ω

   3. Reconnect the AID connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

9. REPLACE AIR INJECTION CONTROL DRIVER 
   1. Replace the AID.
10. CHECK WHETHER DTC OUTPUT RECURS (DTC P1613) 
    1. Connect the intelligent tester to the DLC3 with CAN VIM.
    2. Turn the ignition switch ON and turn the tester ON.
    3. Clear the DTCs (See DTC CHECK/CLEAR ).
    4. Start the engine.
    5. Perform ACTIVE TEST to operate the air injection system.

       Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / AUTOMATIC OPERATION.

    6. After operating the secondary air injection system, confirm the pending codes of the secondary air injection system by entering the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
    NOTE:

    • When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
    • Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.

    OK: 

    DTC P1613 for the secondary air injection system is not output. 

    NG: GO TO  DTC TABLE 

    OK: END