On-Vehicle Inspection
ON-VEHICLE INSPECTION1. INSPECT A/F COMPENSATION SYSTEM
HINT: This system can also be checked using the hand-held tester.
Switch to DATA MONITOR mode and select O2 SENSOR OUTPUT VOLTAGE.
a. Connect the hand-held tester to terminals E6-30 (OX1A) and E6-25 (O1A-) of the ECM.
b. Connect the hand-held tester to terminals E5-28 (OX2A) and E5-21 (O2A-) of the ECM.
NOTE: Connect test leads to the connector's backside. The connectors should not be disconnected from the ECM.
c. Warm up the heated oxygen sensor with the engine speed at 2,500 rpm for approximately 2 minutes.
d. Check that the voltage changes between 0 and 1 V with the engine speed at 2,500 rpm.
OK:
The voltage has changed more than 8 times in 10 seconds.
NOTE:
- Check the voltage immediately after warming up the heated oxygen sensor.
- If change of voltage could not be confirmed, warm up the heated oxygen sensor again.
2. INSPECT FUEL CUT OFF RPM
a. Increase the engine speed to at least 3,000 rpm.
b. Use a sound scope to check the injector operation noise.
OK:
When the throttle lever is released, the injector operation noise stops momentarily but start again soon after.
3. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM
a. Start the engine. Disconnect the vacuum hose as shown in the illustration.
b. From the hand-held tester ACTIVE TEST mode, select PURGE VSV. Check that a vacuum occurs at the VSV port.
c. Exit ACTIVE TEST mode and reconnected the vacuum hose.
d. From the hand-held tester ECU DATA MONITOR mode, select PURGE VSV. Check operation of the purge VSV.
e. Warm up the engine and drive the vehicle. Confirm that the purge VSV is turned from OFF to ON.
4. INSPECT EVAP SYSTEM LINE
a. Warm up the engine to the normal operating temperature and stop the engine.
b. Install a vacuum gauge (EVAP control system test equipment) to the EVAP service port on the purge line.
c. Perform forced driving of the VSV for EVAP.
1. Connect the hand-held tester (with CAN VIM) to the DLC3.
2. Start the engine.
3. Push the hand-held tester main switch ON.
4. Use the hand-held tester ACTIVE TEST mode to operate the VSV for EVAP.
d. Check the vacuum at idle.
Vacuum:
Maintains at 0.368 to 19.713 in.Hg (5 to 268 in.Aq) for over 5 seconds.
HINT: If the vacuum does not change, the hose which connects the VSV to the service port is loose or is blocked, or the VSV is malfunctioning.
e. Finish forced driving of the VSV for EVAP.
1. Stop the engine.
2. Disconnect the hand-held tester from the DLC3.
f. Disconnect the vacuum gauge from the EVAP service port on the purge line.
g. Connect a pressure gauge to the EVAP service port on the purge line.
h. Check the pressure.
1. Close the air drain hose at the marked position with a hose clipper or similar tool.
2. Apply pressure (13.5 to 15.5 in.Aq) from the EVAP service port.
Pressure:
In 2 minutes after pressure is applied, the gauge should indicate over 7.7 to 8.8 in.Aq.
HINT: If pressure could not be applied, the hose which connects the VSV, charcoal canister and fuel tank is disconnected, or the VSV is open.
3. Remove the fuel tank cap while pressure is being applied, and check that the pressure decreases.
HINT: If the pressure does not decrease when the fuel tank cap is removed, then the hose which connects the service port to the fuel tank is blocked.
i. Disconnect the pressure gauge from the EVAP service port on the purge line.
5. CHECK AIRTIGHTNESS IN FUEL TANK AND FILLER PIPE
a. Disconnect the EVAP line hose from the charcoal canister.
1. Pinch portion A.
2. Pull out the connector.
b. Allow the internal pressure in the fuel tank to be 4 kPa (41 gf/sq.cm, 0.58 psi).
c. Check that the internal pressure of the fuel tank remains the same for 1 minute.
d. Check the connected portions of each hose and pipe.
e. Check the installed parts on the fuel tank.
If there is abnormality, replace the fuel tank and filler pipe.
f. Reconnect the EVAP line hose to the charcoal canister.
6. INSPECT FUEL CUT OFF VALVE AND FILL CHECK VALVE
a. Disconnect the purge line hose and EVAP line hose from the charcoal canister.
b. Plug the air drain hose with the cap.
c. Apply 4 kPa (41 gf/sq.cm, 0.58 psi) of pressure to the purge port and check that there is ventilation in the EVAP line hose.
HINT: It is necessary to check the amount of fuel in the fuel tank. When the fuel tank is full, the float valve of the fill check valve is closed and no air can pass through.
1. If air can flow freely from the purge port through to the EVAP line hose, the fuel cutoff valve and fill check valve are operating normally. Go to step (d).
2. If air cannot flow freely from the purge port through to the EVAP line hose, disconnect the vent line hose and EVAP line hose and check if they are clogged or not. If clogged, replace.
3. If the vent line hose and EVAP line hose are operating normally and air still cannot flow freely from the purge port through to the EVAP line hose, replace the fuel cutoff valve and fill check valve.
d. Reconnect the purge line hose to the charcoal canister.
7. CHECK AIR INLET LINE
a. Disconnect the air inlet line hose from the charcoal canister.
b. Check that there is ventilation in the air inlet line hose.
c. Reconnect the air inlet line hose to the charcoal canister.
8. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS
a. Check for cracks, leaks or damage.
HINT:
- Possible leakage points are indicated in the illustration.
- Removal or problems with the engine oil dipstick, 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 trouble.
9. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)
a. Bank 1 sensor 1, bank 2 sensor 1:
Disconnect the sensor connector.
b. Measure the resistance between terminals 1 (HT) and 2 (+B).
c. Bank 1 sensor 2, bank 2 sensor 2:
Disconnect the sensor connector.
d. Measure the resistance between terminals 1 (HT) and 2 (+B).