On-Vehicle Inspection

1ZZ-FE EMISSION CONTROL: EMISSION CONTROL SYSTEM:

ON-VEHICLE INSPECTION

1. INSPECT AIR-FUEL RATIO COMPENSATION SYSTEM
(a) Measure the voltage between the terminals of the ECM connectors.





Voltage:





NOTE: Connect test leads from the back side of the connector. 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.

(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON position.
(d) Select the following menu items: Powertrain / Engine and ECT / Data List/ AFS B1 S1 and O2S B1 S2.
(e) Warm up the A/F sensor with the engine speed at 2,500 rpm for approximately 2 minutes.





(f) Keep the engine speed at 2,500 rpm and confirm that the display of "AFS B1 S1" is as shown in the illustration.

- The illustration may slightly differ from the display on the Techstream.
- Only the Techstream displays the waveform of the A/F sensor.

(g) Confirm that the display of "O2S B1 S2" changes between 0 V and 1 V with the engine speed at 2,500 rpm.
OK:
The voltage output oscillates more than 8 times in 10 seconds.

CAUTION:
- Perform the check immediately after warming the engine up.
- If the voltage variation could not be verified, warm up the heated oxygen sensor again. If it could not be verified even after warming up the sensor again, check the DTC No. (Engine Control System - SFI System).

2. INSPECT FUEL CUT-OFF RPM
(a) Increase the engine speed to at least 3,500 rpm.
(b) Use a sound scope to check for injector operating sounds.
(c) Check that injector operating sounds stop momentarily and then resume when the accelerator pedal is released.
3. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS





(a) Check the appearance.
(1) Check if the indicated portions of the engine assembly are cracked, leaking or damaged.

HINT: Disconnection of the engine oil level gage, oil filler cap, PCV hose, etc. 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, repair the engine assembly.
4. INSPECT FUEL CUTOFF VALVE AND FILL CHECK VALVE





(a) Disconnect the vent line hose from the fuel tank (Removal).
(b) Connect the pressure gauge to the fuel tank.
(c) Fill the fuel tank with fuel.
(d) Apply pressure at 4 kPa (41 gf/cm2, 0.58 psi) to vent port of the fuel tank.

HINT: It is necessary to check the amount of fuel in the fuel tank.

(e) Remove the fuel tank cap, and check that pressure drops.
If the pressure does not drop, replace the fuel tank assembly.
(f) Reconnect the vent line hose to the fuel tank.
5. CHECK AIR INLET LINE





(a) Disconnect the air inlet line hose from the charcoal canister.
(b) 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.
(c) Reconnect the air inlet line hose to the charcoal canister.
6. INSPECT PUMP MODULE (PRESSURE SENSOR)





(a) Measure the power source voltage of the ECM connectors.
Voltage:





If the voltage is not as specified, check the ECM, leak detection pump and wire harness.
(b) Measure the power output of the ECM connectors.
(1) Remove the fuel tank cap.
Voltage:





If the voltage is not as specified, check the ECM, leak detection pump and wire harness.
(2) Install the fuel tank cap.