What should I check first in Step 7 of the P0102 diagnostic table?

Check the MAF sensor signal circuit for an open between the PCM and the MAF sensor, a short between the PCM and the MAF sensor, and a poor connection at the MAF sensor (refer to Testing for Intermittent and Poor Connections in Wiring Systems), then repair as necessary per Wiring Repairs.

When does the P0102 chart say to replace the MAF sensor?

Step 8 directs replacing the MAF sensor (refer to Mass Air Flow (MAF) Sensor Replacement) if no wiring repair was necessary in Step 7; when complete, go to Step 10.

How do I verify the P0102 repair per this document?

In Step 10: clear the DTCs with a scan tool, turn OFF the ignition for 30 seconds, start the engine, and operate the vehicle within the Conditions for Running the DTC until the diagnostic runs. If the DTC runs and passes, go to Step 11; if not, go to Step 2.

What happens if the scan tool shows no other DTCs in Step 11?

If the scan tool does not display any DTCs you have not diagnosed, the result is 'System OK.' If it does, go to the Diagnostic Trouble Code (DTC) List.

When is PCM replacement called for in this P0102 procedure?

Step 9 covers replacing the PCM (refer to Powertrain Control Module (PCM) Replacement); after completion, go to Step 10 to verify.

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DTC P0102 MAF Sensor Diagnostic Table (Steps 7-11) - 2.5L LE8 Engine Controls

GM 2.5L LE8 DTC P0102 continued diagnostic table steps 7-11 MAF and PCM replacement page 6-1452

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GM DTC P0102 diagnostic table (continued): steps 7-11 to check the MAF signal circuit for opens/shorts/poor connections, repair wiring, replace MAF sensor or PCM, then clear and verify the DTC.

AI caption May 2005 · Photo 2314 of 3537

This document is one page (page 6-1452) from a factory service manual section titled "Engine Controls - 2.5L (LE8)," showing the continuation (Steps 7 through 11) of the diagnostic table for DTC P0102 (Mass Air Flow sensor circuit low frequency). Step 7 instructs the technician to check the MAF sensor signal circuit for an open or short between the PCM and MAF sensor and for poor connections at the MAF sensor, repairing as necessary per Wiring Repairs procedures. Step 8 covers MAF sensor replacement, and Step 9 covers Powertrain Control Module (PCM) replacement. Step 10 details verification: clearing DTCs with a scan tool, turning the ignition off for 30 seconds, starting the engine, and operating the vehicle within the Conditions for Running the DTC to confirm the diagnostic runs and passes. Step 11 uses the scan tool's Capture Info to check for any remaining undiagnosed DTCs; if none, the result is "System OK." A reader learns the step-by-step decision flow (Yes/No branches) for isolating whether a P0102 fault lies in wiring, the MAF sensor itself, or the PCM, and how to verify the repair afterward.

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Frequently asked questions

What should I check first in Step 7 of the P0102 diagnostic table?: Check the MAF sensor signal circuit for an open between the PCM and the MAF sensor, a short between the PCM and the MAF sensor, and a poor connection at the MAF sensor (refer to Testing for Intermittent and Poor Connections in Wiring Systems), then repair as necessary per Wiring Repairs.
When does the P0102 chart say to replace the MAF sensor?: Step 8 directs replacing the MAF sensor (refer to Mass Air Flow (MAF) Sensor Replacement) if no wiring repair was necessary in Step 7; when complete, go to Step 10.
How do I verify the P0102 repair per this document?: In Step 10: clear the DTCs with a scan tool, turn OFF the ignition for 30 seconds, start the engine, and operate the vehicle within the Conditions for Running the DTC until the diagnostic runs. If the DTC runs and passes, go to Step 11; if not, go to Step 2.
What happens if the scan tool shows no other DTCs in Step 11?: If the scan tool does not display any DTCs you have not diagnosed, the result is 'System OK.' If it does, go to the Diagnostic Trouble Code (DTC) List.
When is PCM replacement called for in this P0102 procedure?: Step 9 covers replacing the PCM (refer to Powertrain Control Module (PCM) Replacement); after completion, go to Step 10 to verify.