On-Vehicle Inspection

ON-VEHICLE INSPECTION

1. CHECK AIR FUEL RATIO COMPENSATION SYSTEM




a. Inspect the voltage.
1. Turn the power switch ON (IG).




2. Using a voltmeter, measure the voltage between the ECM terminals.

NOTE: Connect the test leads from the backside of the connector with the ECM connector connected.

HINT: The voltage between the ECM terminals is constant regardless of the output voltage of the air-fuel ratio sensor.

If the result is not as specified, check the air-fuel ratio sensor and wire harness.

b. Check the output waveform.
1. Set the vehicle to inspection mode.




2. Connect the intelligent tester to the DLC3.
3. Turn the power switch ON (READY).
4. Turn the intelligent tester ON.
5. Select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / AFS B1 S1.
6. Warm up the air fuel ratio sensor for approximately 2 minutes at 2,500 rpm of the engine speed.




7. Maintain the engine speed at 2,500 rpm, then check that the waveform of "AFS B1 S1" is output as illustrated.

HINT:
- The waveform of illustration is a sample.
- Only the intelligent tester shows the waveform of the air fuel ratio sensor.

8. Check that "O2S B1 S2"fluctuates between 0 and 1 V with the engine speed at 2,500 rpm.