Emission Control System Onvehicle Inspection

1. INSPECT AIR-FUEL RATIO COMPENSATION SYSTEM

HINT:

You can also check the system by choosing "DATA MONITOR", then "O2 SENSOR OUTPUT VOLTAGE" on the monitor of the hand-held tester.

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OX1B

OX1B

(a) Connect the hand-held tester to the terminal 23 (OX1A) o 7 (E1) and 21 (OX1B) o 7 (E1) of the ECM.

CAUTION:

Connect test leads from the back side of the connector with the ECU connected.

(b) Warm up the oxygen sensor with the engine speed at 2,500 rpm for approx. 2 minutes.

(c) Confirm that the voltage changes between 0V to 1V with the engine speed at 2,500 rpm. OK:

The voltage changes more than 8 times in 10 seconds. CAUTION:

• Perform the check immediately after the end of the warming up.

• If not confirming the change of voltage, warming up the oxygen sensor again.

INSPECT FUEL CUT OFF RPM

Increase the engine speed to at least 3,500 rpm. Use a sound scope to check for injector operating noise.

Check that when the throttle lever is released, injector operation noise stops momentarily and then resumes.

OX1A

A65749

1204D-0

INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM

After starting the engine, disconnect the vacuum hose shown in the illustration.

Confirm vacuum occurs at the vsv port, when choosing "ACTIVE TEST" and "PURGE VSV" according to the display on hand-held tester.

Finish "ACTIVE TEST", then connect the vacuum hose again.

After going to "ECM DATA MONITOR" on the hand-held tester, choose "PURGE VSV" to check the operation of the purge VSV.

After warm up the engine and drive the vehicle, confirm the VSV turns on from off.

2000 Toyota Echo Purge Vsv Location1kzte Injector Pump Diagram

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