On-Vehicle Inspection
ON-VEHICLE INSPECTION1. INSPECT AIR FUEL RATIO COMPENSATION SYSTEM
(a) Inspect the voltage.
(1) Turn the ignition switch ON.
(2) Using a voltmeter, measure the voltage between the terminals of the ECM.
CAUTION: Connect the test leads from the back side of the ECM connector to the terminals.
HINT: The voltage between the terminals of the ECM is constant regardless of the voltage output from the air fuel ratio sensor (A/F sensor).
(b) Check the operation.
(1) Connect the hand-held tester to the DLC3.
(2) Enter "DIAGNOSIS/ENHANCED OBD II/DATA LIST", then select "AFS B1 S1" and "AFS B2 S1" to display the monitor.
(3) Warm up the A/F sensor with the engine speed at 2,500 rpm for approximately 2 minutes.
(4) Keep the engine speed at 2,500 rpm, then confirm that the waveform of "AFS B1 S1" and "AFS B2 S1" are similar as shown in the illustration.
HINT:
- The waveform in the illustration is a sample.
- Only the hand-held tester displays the waveform of the NF sensor.
(c) Confirm that the display of "DATA LIST" - "O2S B1 S2" and "O2S B2 S2" fluctuates up and down between 0 V and 1 V with the engine speed at 2,500 rpm.
2. INSPECT FUEL CUT OFF RPM
(a) Check the operation.
(1) Increase the engine speed to at least 3,500 rpm.
(2) Use a sound scope to check the fuel injector operating noise.
(3) Check that when the throttle lever is released, the fuel injector operation noise stops momentarily at 2,500 rpm and then resumes at 1,200 rpm.
2,500 rpm: Fuel cut off rpm
1,200 rpm: Fuel return rpm
3. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS
(a) Check the appearance.
(1) Check the engine assembly to see if the indicated portions by the arrows have cracks, leaks or damage.
HINT: Separation of the engine oil level gauge, 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 EVAP SYSTEM LINE
(a) Warm up the engine to the normal operating temperature.
(b) Connect the vacuum gauge (EVAP control system test equipment vacuum gauge) to the EVAP service port on the purge line. Then stop the engine.
(c) If you have the hand-held tester:
Force the VSV for EVAP to operate.
(1) Connect the hand-held tester to the DLC3.
(2) Start the engine.
(3) Turn the hand-held tester ON.
(4) Use the ACTIVE TEST mode on the hand-held tester to operate the VSV for EVAP.
(d) If you have no hand-held tester:
Force the VSV for EVAP to operate.
(1) Disconnect the VSV for EVAP connector.
(2) Connect the positive (+) and negative (-) leads of the battery to the VSV for EVAP terminals.
(3) Start the engine.
(e) Check the vacuum at idle.
Vacuum: Maintain at 0.368 to 19.713 in.Hg (5 to 268 in.Aq) for over 5 seconds.
HINT: If the vacuum does not change, it can be concluded that the hose which connects the VSV to the service port is loose or blocked, or the VSV is malfunctioning.
(f) If you have the hand-held tester:
Return to the normal VSV for EVAP.
(1) Stop the engine.
(2) Disconnect the hand-held tester from the DLC3.
(g) If you have no hand-held tester:
Return to the normal VSV for EVAP.
(1) Stop the engine.
(2) Disconnect the positive (+) and negative (-) leads of the battery from the VSV for EVAP terminals.
(3) Reconnect the VSV for EVAP connector.
(h) Disconnect the vacuum gauge from the EVAP service port on the purge line.
(i) Connect a pressure gauge to the EVAP service port on the purge line.
(j) If you have the hand-held tester:
Force the VSV for CCV to operate.
(1) Connect the hand-held tester to the DLC3.
(2) Turn the ignition switch ON.
(3) Turn the hand-held tester ON.
(4) Use the ACTIVE TEST mode on the hand-held tester to operate the VSV for CCV.
NOTICE: Do not start the engine during this operation.
HINT: If the check is not completed within 10 minutes, the forced close of the VSV for CCV will be tested.
(k) If you have no hand-held tester:
Force the VSV for CCV to operate.
(1) Disconnect the VSV for CCV connector.
(2) Connect the positive (+) and negative (-) leads of the battery to the VSV for CCV terminals.
(l) Check the pressure.
(1) Add the pressure (13.5 to 15.5 in.Aq) from the EVAP service port.
Pressure: 2 minutes after the pressure is added, the gauge should be over 7.7 to 8.8 in.Aq.
HINT: If you cannot add the pressure, it can be concluded that the hose which connects the VSV for EVAP canister fuel tank is slipped off or the VSV is open.
(2) Check if the pressure decreases when the fuel tank cap is removed while adding the pressure.
HINT: If the pressure does not decrease when the filler cap is removed, it can be concluded that the hose which connects the service port to the fuel tank is blocked, etc.
(m) If you have the hand-held tester:
Return to the normal VSV for CCV operation.
(1) Turn the ignition switch ON.
(2) Disconnect the hand-held tester from the DLC3.
(n) If you have no hand-held tester:
Return to the normal VSV for CCV operation.
(1) Disconnect the positive (+) and negative (-) leads of the battery to the VSV for CCV terminals.
(2) Reconnect the VSV for CCV connector.
(o) Disconnect the pressure gauge from the EVAP service port on the purge line.
5. CHECK AIR TIGHTNESS IN FUEL TANK AND FILLER PIPE
(a) Check the operation.
(1) Remove the fuel tank.
(2) Remove the fuel tank vent hose from the fuel tank.
(3) Connect the pressure gauge to the fuel tank vent hose port of the fuel tank.
(4) Apply pressure to the fuel tank, so that the internal pressure of the fuel tank is 4 kPa (41 gf/cm2, 0.58 psi).
(5) Check that the internal fuel tank pressure is maintained for 1 minute.
(6) Check the connected portions of each hose and pipe.
(7) Check the installed parts on the fuel tank.
If there is no abnormality, replace the fuel tank and fuel tank filler pipe.
(8) Reinstall the fuel tank vent hose to the fuel tank.
(9) Reinstall fuel tank.
6. INSPECT FUEL CUT OFF VALVE AND FILL CHECK VALVE
(a) Check the operation.
(1) Remove the fuel tank.
(2) Remove the fuel tank vent hose from the fuel tank.
(3) Connect the pressure gauge to the fuel tank vent hose port of the fuel tank.
(4) Fully fill the fuel tank with fuel.
HINT: In the condition that the fuel is full, there is no ventilation as the float valve of the fill check valve is closed.
(5) Install the fuel suction w/pump & gauge tube.
(6) Securely cover the fuel pump tube, fuel tube No.1 port and fuel tank to filler pipe port with vinyl or plastic bags to perform the accurate pressure test.
(7) Apply 4 kPa (41 gf/cm2, 0.58 psi) of pressure to the fuel tank vent hose port of the fuel tank.
(8) Remove the vinyl or plastic bag from the fuel tank to filler pipe port, then check that the pressure drops.
If the pressure does not drop, replace the fuel tank.
(9) Drain fuel from the fuel tank.
(10) Reinstall the fuel tank vent hose to the fuel tank.
(11) Reinstall the fuel tank.
7. CHECK AIR INLET LINE
(a) Disconnect the fuel tank vent hose.
(b) Check that there is ventilation in fuel tank vent hose.
If necessary, replace the charcoal canister filter.
(c) Reconnect the fuel tank vent hose.
8. INSPECT VAPOR PRESSURE SENSOR
(a) Inspect the voltage (power source).
(1) Turn the ignition switch ON.
(2) Using a voltmeter, measure the voltage between the terminals of the ECM.
CAUTION: Connect the test leads from the back side of the ECM connector to the terminals.
(3) Turn the ignition switch OFF
(b) Inspect the voltage (power output).
(1) Turn the ignition switch ON.
(2) Remove the fuel tank cap.
(3) Using a voltmeter, measure the voltage between the terminals of the ECM.
CAUTION: Connect the test leads from the back side of the ECM connector to the terminals.
(4) Reinstall the fuel tank cap.
(5) Turn the ignition switch OFF.