Service Repair Manual

MPI SYSTEM

MPI SYSTEM COMPONENTS INSPECTION

Air Flow Sensor (AFS)

1. Connect a voltmeter between 6 and 3 of AFS connector.

Terminal 6 : Sensor ground

Terminal 3 : AFS output

2. Warm the engine and bring it to a normal idle.

3. Measure the voltage between terminals.

Engine speed (rpm)

Output voltage (V)

Idling

3,000

2.7-3.2

NOTE

If the air flow sensor fails, the intake air volume cannot

be measured and as a result, normal fuel injection control

is no longer available. The vehicle can be run, however,

by a preset map value.

Barometric Pressure Sensor

1. Connect a voltmeter between terminals 5 and 6 of the

barometric pressure sensor connector.

Terminal 5 : Barometric sensor output

Terminal 6 : Sensor ground

2. Warm the engine and bring it to a normal idle.

Slowly cover about half of the air cleaner air intake, checking

for a change in voltage.

Pressure

Fall

Voltage

Drop

31-44