On-Vehicle Inspection

ON-VEHICLE INSPECTION




1. INSPECT AIR-FUEL RATIO COMPENSATION SYSTEM
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to ON.
c. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / O2S B1 S1 and O2S B1 S2.
d. Warm up the heated oxygen sensor with the engine speed at 2,500 rpm for approximately 2 minutes.
e. Confirm that the voltage output 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.

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 stops momentarily and then resumes when the throttle lever is released.




3. 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.




4. 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.




5. INSPECT LEAK DETECTION PUMP (PRESSURE SENSOR)




a. Measure the power source voltage of the ECM connectors.

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.