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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Engine Controls - Self-Diagnostics - 3.0L) >> Diagnostic Tests >> DTC P0103: MAF Sensor Circuit - High Signal/Frequency >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine. Using scan tool, monitor MAF sensor. If voltage reading is more than 4.8 volts, go to next step. If voltage reading is not more than 4.8 volts, problem is intermittent. See DIAGNOSTIC AIDS  .
  2. Disconnect MAF sensor harness connector. MAF sensor is located on air cleaner assembly. Turn ignition on, with engine off. Using scan tool, observe MAF sensor. If voltage reading is less than 0.14 volt, go to next step. If voltage reading is not less than 0.14 volt, go to step  4 .
  3. Using DVOM, measure voltage between MAF sensor harness connector terminals No. 3 (Black wire) and No. 4 (Black wire). If 4-6 volts are present, check MAF sensor harness connector. If connector is okay, replace MAF sensor. If voltage is not 4-6 volts, go to step  7 .
  4. Using a DVOM, check voltage on MAF sensor harness connector terminal No. 5 (Yellow wire). If voltage reading is a 4-6 volts, go to next step. If voltage reading is not 4-6 volts, go to step  6 .
  5. Check for short between Black wire and Yellow wire. Check for short between Tan wire and Yellow wire. Repair as necessary.
  6. Check for short to voltage in Yellow wire, or short between White wire and Yellow wire. Repair as necessary.
  7. Using DVOM, measure voltage at MAF sensor harness connector terminal No. 4 (Black wire). If voltage is 4-6 volts, check for open in Purple/White wire between MAF sensor and ECM. If voltage is not 4-6 volts, diagnose fault in 5-volt reference "A" circuit (Black wire).
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