On-Vehicle Inspection

INSPECT AIR FUEL RATIO COMPENSATION SYSTEM

Measure the voltage between the terminals of the ECM connectors.

Fig 1: Identifying ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
E9-22 (A1A+) - E7-1 (E2)	Ignition switch ON	3.3 V
E9-30 (A1A-) - E7-1 (E2)	Ignition switch ON	3.0 V
E9-23 (A2A+) - E7-1 (E2)	ignition switch ON	3.3 V
E9-31 (A2A-) - E7-1 (E2)	Ignition switch ON	3.0 V

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

HINT:

Voltage of the ECM is kept constant regardless of the voltage of the air fuel ratio sensor.

Connect an intelligent tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the Data Link Connector 3 (DLC3).

Fig 2: Checking DTC Using Intelligent Tester
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Select "DATA LIST". Then select "AFS B1 S1", "AFS B2 S1", "O2S B1 S2" and "O2S B2 S2" to display the monitors.
Warm up the air fuel ratio sensor with the engine speed at 2,500 rpm for approximately 2 minutes.
Maintain the engine speed at 2,500 rpm and confirm that the displays of "AFS B1 S1" and "AFS B2 S1" are as shown below.
HINT:
- The illustration may differ slightly from the display on the intelligent tester.
- Only the intelligent tester displays the waveform of the air fuel ratio sensor.
Confirm that the display of "O2S B1 S2" and "O2S B2 S2" changes between 0 and 1 V with the engine speed at 2,500 rpm.

Fig 3: Identifying Air Fuel Ratio Graph
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT FUEL CUT OFF/RESTART RPM

Increase the engine speed to at least 2,500 rpm.
Use a sound scope to check for injector operating sounds.

Check that when the throttle lever is released, injector operation sound stops momentarily (at 2,500 rpm) and then resumes (at 1,200 rpm).

Standard

STANDARD REFERENCE

Item	Specified Condition
Fuel cut off rpm	1,800 rpm
Fuel injector restart rpm	1,500 rpm

VISUALLY INSPECT HOSE, CONNECTIONS AND GASKETS
1. Check for cracks, leaks or damage.
  
  Fig 4: Checking Engine For Cracks, Leaks Or Damage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  Separation of the engine oil dipstick, oil filler cap, PCV hose, etc. may causes 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.
INSPECT EVAP SYSTEM LINE
1. Warm up the engine to normal operating temperature and stop the engine.
2. Install a vacuum gauge (EVAP control system test equipment vacuum gauge) into the EVAP service port on the purge line.
3. When using an intelligent tester: Force the VSV for EVAP to operate.
  
  Fig 6: Checking DTC Using Intelligent Tester
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Connect an intelligent tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the Data Link Connector 3 (DLC3).
  2. Start the engine.
  3. Turn the intelligent tester main switch on.
  4. Use the ACTIVE TEST mode on the intelligent tester to operate the VSV for the EVAP.
4. Check the vacuum.
  Vacuum:
  
  Maintain between 0.368 and 19.713 in.Hg (5 to 268 in.Ag) for over 5 seconds.
  
  HINT:
  
  If the vacuum does not change, the hose connecting the VSV and the service port is loose or blocked, or the VSV is malfunctioning.
5. When using an intelligent tester: Conclude operation of the VSV for EVAP.
  1. Stop the engine.
  2. Disconnect the intelligent tester from the DLC3.
    
    Fig 7: Checking EVAP System Line Vacuum
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. When not using an intelligent tester: Conclude operation of the VSV for EVAP.
  1. Stop the engine.
  2. Disconnect the positive (+) and negative (-) leads of the battery from the VSV for EVAP terminals.
  3. Connect the VSV for EVAP connector.
7. Disconnect the vacuum gauge from the EVAP service port on the purge line.
8. Connect a pressure gauge to the EVAP service port on the purge line.
9. Check the pressure.
  1. Disconnect the charcoal canister hose.
  2. Pinch the charcoal canister hose with the hose clipper to prevent air from entering into the canister passage.
  3. Apply pressure (13.5 to 15.5 in.Aq, 0.99 to 1.14 in.Hq) from the EVAP service port.
    Pressure:
    
    The gauge should still read over 7.7 to 8.8 in.Aq (0.57 to 0.65 in.Hq) for 2 minutes after the pressure is applied.
    
    HINT:
    
    If you cannot apply pressure, the hose connecting the VSV, charcoal canister and fuel tank has slipped off or the VSV is open.
  4. Check if the pressure decreases when releasing the hose clipper while applying pressure.
    HINT:
    
    If the pressure does not decrease when the filler cap is removed, the hose connecting the service port and the fuel tank may be blocked.
10. Disconnect the pressure gauge from the EVAP service port on the purge line.
CHECK AIR INLET LINE
1. Disconnect the air inlet line hose from the charcoal canister.
2. Check that air can flow freely into the air inlet line. If air cannot flow freely into the air inlet line, repair or replace it.
3. Reconnect the air inlet line hose to the charcoal canister.