TESTING

Navajo and B Series Pick-up Models

1. With the engine running at idle, use a DVOM to verify there is at least 10.5 volts between terminals A and B of the MAF sensor connector. This indicates the power input to the sensor is correct. Then, measure the voltage between MAF sensor connector terminals C and D. If the reading is approximately 0.34–1.96 volts, the sensor is functioning properly.

   Fig. 1: MAF sensor wire harness connections

MPV Models

1994–95 — 2.6L ENGINE

1. Remove the rubber boot from the Mass Air Flow (MAF) sensor wiring connector.
2. Using a voltmeter, measure the terminal voltages. Refer to the specifications chart.

   Fig. 2: Using a voltmeter to measure terminal voltages

   Fig. 3: MAF sensor voltage specifications chart

   Fig. 4: MAF sensor schematic

3. If not as specified, inspect the wiring harness for an open or short circuit. If the wiring is okay, check the burn off operation as follows:
   1. Disconnect the negative battery cable for 20 seconds and reconnect it.
   2. Start the engine and allow it to warm up to operating temperature.
   3. Remove the rubber boot from the Mass Air Flow (MAF) sensor wiring connector.
   4. Run the engine for more than 5 seconds at approximately 2000 rpm in neutral.
   5. Turn the ignition switch OFF and check the voltage at the MAF sensor terminal wire (G/O) and terminal 2H of the powertrain control module. There should be 0 volts just after the ignition switch is turned OFF, then approximately 8 volts battery positive voltage momentarily 2–5 seconds after turning the ignition switch OFF.
4. If not as specified, replace the MAF sensor.

1996–98 — 3.0L ENGINE

1. Inspect the MAF sensor for damage and cracks.
2. Start the engine and allow it to warm up to operating temperature.
3. Shift the gear selector lever to the P (PARK) position.
4. Make sure that all electrical loads are turned OFF. (Ex. headlights, blower motor, etc.)
5. Connect the New Generation Star (NGS) tester, or equivalent scan tool, to the data link connector, located under the driver side dashboard.
6. Select the "PID/DATA MONITOR AND RECORD" function of the tester display.
7. Select "MAF V" on the tester display. The voltage should read as follows:
   • Ignition switch ON: 0.5–1.0 Volts
   • Engine at idle: 1.0–2.0 Volts

     Fig. 5: Mas air flow sensor connector terminal identifications

8. If not as specified, inspect the following:
   • Harness continuity between PCM terminal 3B and MAF sensor connector terminal B
   • Harness continuity between PCM terminal 4A and MAF sensor connector terminal E
   • Harness continuity between main relay terminal D and MAF sensor connector terminal A
   • Turn the ignition switch to the ON position and measure for battery positive voltage at MAF sensor connector terminal A.
9. Measure the resistance between MAF sensor connector terminals C and D. The resistance should measure 2.21–2.69k ohms at 68°F (20°C).
10. If there is incorrect terminal voltage, harness continuity or resistance measurements, replace the MAF sensor.