On-Vehicle Inspection

1. Measure the voltage between terminals of the engine ECM connectors.

   Standard: 

   ENGINE ECM CONNECTORS VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   E7-23 (AF1A+) - E6-1(E1)	Ignition switch ON	3.3V
   E7-31 (AF1A-) - E6-1(E1)	Ignition switch ON	3.0V

   NOTE: Connect test leads to the connector's backside. The connectors should not be disconnected from the ECM.

   HINT:

   Voltage between the terminals of the ECM is kept constant regardless of the voltage of the A/F sensor.

2. Connect the hand-held tester to the DLC3.
3. Select "DATA MONITOR". Then select "A/FS b1 S1", "A/FS B2 S1" and "O2S b1 S2" to display the monitors.
4. Warm up the A/F sensor with the engine speed at 2,500 RPM for approximately 2 minutes.
   Fig 1: Identifying ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Keep the engine speed at 2,500 RPM and confirm that the displays of "A/FS B1 S1" and "A/FS B2 S1" are as shown in the illustration.

   HINT:

   • The illustration may differ slightly from the display on the hand held tester.
   • Only the hand-held tester displays the waveform of the A/F sensor.
6. Confirm that the display of "O2S B1 S2" changes between 0 V to 1 V with the engine speed at 2,500 RPM.
   Fig 2: Displaying Of A/FS B1 S1 And A/FS B2 S1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Increase the engine speed to at least 3,500 RPM.
2. Use a sound scope to check for injector operating sounds.
3. Check that when the throttle lever is released, injector operation sounds stop momentarily (at 2,500 RPM) and then resume (at 1,400 RPM).

   Standard: 

   INJECTOR OPERATING SOUNDS CONDITION
   
   

   Item	Specified Condition
   Fuel cut off rpm	2,500 rpm
   Fuel return rpm	1,400 rpm

1. Check for cracks, leaks or damage.

   HINT:

   Removal or problems with the engine oil dipstick, oil filler cap, PCV hose and other components may cause the engine to run improperly. Disconnection, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will allow air suction and cause the engine to run improperly.

   If necessary, replace any damaged parts.

   Fig 3: Checking Points Of Hoses, Connections And Gaskets For Cracks, Leaks Or Damage

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT EVAP SYSTEM LINE 

1. Warm up and stop the engine.
   1. Warm up the engine to normal operating temperature.
2. Install a vacuum gauge (EVAP control system test equipment vacuum gauge) to the EVAP service port on the purge line.
   Fig 4: Installing Vacuum Gauge To EVAP Service Port On Purge Line

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Connect the hand-held tester to the DLC3.
4. Start the engine.
5. Turn the hand-held tester main switch ON.
6. Use the ACTIVE TEST mode on the hand-held tester to operate the VSV for EVAP.
   Fig 5: Connecting Hand-Held Tester To DLC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Check the vacuum while the engine is idling.

   Standard: 

   Maintain at 0.368 to 19.713 in.Hg (5 to 268 in.Aq) for over 5 seconds. 

   Fig 6: Checking Vacuum While Engine Is Idling

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   If the vacuum does not change, the hose connecting the VSV to the service port has come loose or is blocked, or the VSV is malfunctioning.

8. Stop the engine.
9. Disconnect the hand-held tester from the DLC3.
10. Disconnect the vacuum gauge from the EVAP service port on the purge line.
Fig 7: Connecting Pressure Gauge To EVAP Service Port On Purge Line
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
11. Connect a pressure gauge to the EVAP service port on the purge line.
12. Connect the hand-held tester to the DLC3.
13. Turn the ignition switch ON.
14. Turn the hand-held tester main switch ON.
15. Use the ACTIVE TEST mode on the hand-held tester to operate the VSV for CCV.
    NOTE: In step (m), the ignition switch should be ON, but the engine should not be running.

    HINT:

    If the check is not completed within 10 minutes, the VSV for CCV will be reset and close automatically.

    Fig 8: Connecting Hand-Held Tester To DLC3

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
16. Check the pressure.
    1. Add 13.5 to 15.5 in.Aq of pressure from the EVAP service port.

       Standard: 

       2 minutes after the pressure is added, the gauge should still read over 7.7 to 8.8 in.Aq. 

       Fig 9: Adding Pressure From EVAP Service Port

       Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

       HINT:

       If you cannot add pressure, the hose connecting the VSV for EVAP canister fuel tank has become disconnected or the VSV is open.

    2. Check if the pressure decreases when the fuel tank cap is removed while adding pressure.

       HINT:

       If the pressure does not decrease when the fuel tank cap is removed, the hose connecting the service port to the fuel tank is blocked.

       Fig 10: Checking Pressure Decreases When Fuel Tank Cap Is Removed While Adding Pressure

       Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
17. Turn the ignition switch OFF.
18. Disconnect the hand-held tester from the DLC3.

INSPECT EVAP SYSTEM LINE 

1. Warm up and stop the engine.
   1. Warm up the engine to normal operating temperature.
2. Install a vacuum gauge (EVAP control system test equipment vacuum gauge) to the EVAP service port on the purge line.
   Fig 11: Installing Vacuum Gauge To EVAP Service Port On Purge Line

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the VSV for EVAP connector.
4. Connect the battery's positive (+) and negative (-) leads to the VSV for EVAP terminals.
5. Start the engine.
   Fig 12: Connecting Battery's Positive (+) And Negative (-) Leads To VSV For EVAP

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Check the vacuum while the engine is idling.

   Standard: 

   Maintain at 0.368 to 19.713 in.Hg (5 to 268 in.Aq) for over 5 seconds. 

   Fig 13: Checking Vacuum While Engine Is Idling

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   If the vacuum does not change, the hose connecting the VSV to the service port has come loose or is blocked, or the VSV is malfunctioning.

7. Stop the engine.
8. Disconnect the battery's positive (+) and negative (-) leads from the VSV for EVAP terminals.
9. Reconnect the VSV for EVAP connector.
10. Disconnect the vacuum gauge from the EVAP service port on the purge line.
11. Connect a pressure gauge to the EVAP service port on the purge line.
    Fig 14: Connecting Pressure Gauge To EVAP Service Port On Purge Line

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
12. Disconnect the VSV for CCV connector.
13. Connect the battery's positive (+) and negative (-) leads to the VSV for CCV terminals.
    NOTE: Incorrect electrode connection causes damage to the VSV. Pay due attention when connecting the lead wire.