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Home >> Saturn >> 2000 >> LS2 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0103: MAF Sensor Circuit - High Signal/Frequency >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, recheck if DTC resets.
  2. Turn ignition on, with engine off. Using scan tool, monitor MAF sensor. If voltage reading is greater than 4.8 volts, go to next step. If voltage reading is not greater than 4.8 volts, problem is intermittent. See DIAGNOSTIC AIDS .
  3. Turn ignition off. Disconnect MAF sensor harness connector. Turn ignition on, with engine off. Using scan tool, observe MAF sensor. If voltage reading is zero volts, go to next step. If voltage reading is not zero volts, go to step  5.
  4. Reconnect MAF sensor harness connector. Using scan tool, monitor IAT sensor. If scan tool reading is about duct air temperature reading, check for terminal tightness at connectors. Repair as necessary. If connectors are okay, replace MAF sensor. If scan tool reading is not about duct air temperature, replace IAT sensor.
  5. 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  7.
  6. Check for short between MAF sensor harness connector terminals No. 4 (Gray wire) and No. 5 (Yellow wire) circuits. Check for short in MAF sensor harness connector terminal No. 1 (Tan/Black wire) circuit to ECM. See WIRING DIAGRAMS article. Repair as necessary.
  7. Check for short to voltage in MAF sensor harness connector terminal No. 5 (Yellow wire) circuit to ECM. Check for short in MAF sensor harness connector terminal No. 2 (Orange wire) circuit to fuse block. See WIRING DIAGRAMS article. Repair as necessary. If circuits are okay, replace ECM.
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