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DTC P0102 MAF Sensor Low Voltage Diagnosis - 2.5L LE8 Engine Controls Manual
Reference · 1992-1996 BroncoAll 143 service procedures
GM engine-controls diagnostic for DTC P0102 (MAF sensor circuit low voltage) on the 2.5L LE8: sets when MAF output current is under 0.64 mA for more than 5 seconds; lists conditions and diagnostic aids.
Part of 1992-1996 Ford Bronco Service Procedures
This is page 6-1450 from a factory service manual section titled "Engine Controls - 2.5L (LE8)", covering diagnostic trouble code DTC P0102 (Mass Air Flow sensor circuit low voltage). The circuit description explains that the MAF sensor measures airflow and the powertrain control module (PCM) monitors current flow on the sensor signal wire to calculate fuel requirements; the MAF sensor is integral to the throttle body assembly. The DTC runs with the ignition ON or engine running, and sets when MAF sensor output current is less than 0.64 mA for more than 5 seconds. When the code sets, the PCM illuminates the MIL, stores Freeze Frame data, and enters Fail-safe mode, controlling injector drive time and IAC duty cycle from TP sensor input and engine speed. The MIL clears after 3 consecutive passing trips; a History DTC clears after 40 warm-up cycles, or via scan tool. Diagnostic Aids cover misrouted or damaged wiring harnesses, air intake restrictions, and a detailed scan-tool procedure using the Not Ran Since Code Cleared list to verify intermittent faults, plus guidance on using Freeze Frame data when the fault cannot be duplicated.
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Frequently asked questions
- What conditions set DTC P0102?
- DTC P0102 sets when the MAF sensor output current is less than 0.64 mA and the condition is present for more than 5 seconds, with the ignition key ON or the engine running.
- What does the PCM do when DTC P0102 sets?
- The PCM illuminates the malfunction indicator lamp (MIL), records the operating conditions in the Freeze Frame buffer, and enters Fail-safe mode, determining injector drive time and IAC duty cycle from the throttle position sensor input and engine speed.
- How is the MIL/DTC cleared for P0102?
- The MIL turns OFF after 3 consecutively passing trips without a fault present; a History DTC clears after 40 consecutive warm-up cycles without a fault; or use the scan tool clear DTC Information function.
- What should be checked as diagnostic aids for P0102?
- Check for a misrouted wiring harness routed too close to high voltage or high amperage circuits, a damaged wiring harness (wiggle-test while watching the scan tool display), and an air intake restriction.
- Where is the MAF sensor located on this engine?
- The document states the MAF sensor is an integral part of the throttle body assembly.
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