See Figure 1
The Mass Air Flow (MAF) sensor directly measures the mass of the air flowing into the engine. The sensor output is an analog signal ranging from about 0.5-5.0 volts. The signal is used by the ECU to calculate the injector pulse width. The sensing element is a thin platinum wire wound on a ceramic bobbin and coated with glass. This "hot wire'' is maintained at 11°F (200°C) above the ambient temperature as measured by a constant "cold wire''. The MAF sensor is located in the outlet side of the air cleaner lid assembly.
- Make sure the ignition key is OFF .
- Connect Breakout Box T83L-50EEC-IV or equivalent, to the computer control module harness, then connect the control module.
- Start the engine and let it idle.
- Use a voltmeter to measure the voltage between test pin 50 of the breakout box and the battery negative post.
- Replace the MAF sensor if the voltage is not 0.36-1.50 volts.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Remove the air intake tube.
- Detach the MAF sensor electrical connector.
- Unfasten the sensor attaching screws, then remove the sensor.
Inspect the MAF sensor-to-air cleaner lid gasket for any signs of deterioration. Replace the gasket, as necessary. If scraping is necessary, be careful not to damage the air cleaner lid or the MAF sensor gasket surfaces.
- Installation is the reverse of the removal procedure.