On-Vehicle Inspection

ON-VEHICLE INSPECTION




1. INSPECT AIR-FUEL RATIO COMPENSATION SYSTEM




a. Measure the voltage of the ECM connectors.

HINT: Voltage of the ECM is kept constant regardless of the voltage of the A/F sensor.

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

b. Connect the intelligent tester to the DLC3.
c. Select "DATA MONITOR". Then select "A/FS B1 S1", "A/FS B2 S1" and "O2S B1 S2" to display the monitors.
d. Warm up the A/F sensor with the engine speed at 2,500 rpm for approximately 2 minutes.




e. Maintain the engine speed at 2,500 rpm and confirm that the displays of "A/FS B1 S1" and "A/FS B2 S1" are as shown in the illustration.

HINT:
- The illustration may differ slightly from the display on the intelligent tester.
- Only the intelligent tester displays the waveform of the A/F sensor.

f. Confirm that the display of "O2S B1 S2" changes between 0 to 1 V with the engine speed at 2,500 rpm.

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 when the throttle lever is released, injector operation sounds stop momentarily (at 2,500 rpm) and then resume (at 1,400 rpm).




3. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS
a. Check for cracks, leaks or damage.

HINT: Removal or problems with the engine oil dipstick, oil 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 to run improperly. If necessary, replace any damaged parts.




4. CHECK AIR TIGHTNESS IN FUEL TANK AND FILLER PIPE

a. Disconnect the vent line hose from the fuel tank.
b. Connect the pressure gauge to the fuel tank.
c. Apply pressure to the fuel tank to create an internal pressure of 4 kPa (41 gf/sq.cm, 0.58 psi).
d. Check that the internal pressure of the fuel tank is maintained for 1 minute.
e. Check the connected portions of each hose and pipe.
f. Check the installed parts on the fuel tank. If malfunctions, damage or other problems are found, replace the fuel tank and filler pipe.
g. Reconnect the vent line hose to the fuel tank.




5. INSPECT FUEL CUTOFF VALVE AND FILL CHECK VALVE
a. Disconnect the vent line hose from the fuel tank .
b. Connect the pressure gauge to the fuel tank.
c. Fill the fuel tank with fuel until full.

HINT: When the fuel tank is full, the float valve of the fill check valve is closed and no air can pass through.

d. Apply pressure of 4 kPa (41 gf/sq.cm, 0.58 psi) to the vent port of the fuel tank.
e. Remove the fuel tank cap, and check that pressure drops. If pressure does not drop, replace the fuel tank assembly.
f. Reconnect the vent line hose to the fuel tank.




6. 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.