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Home >> Mazda >> 2003 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0102: Mass Airflow Sensor Circuit, Low Input >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Mazda Protege5 and 2002 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  9.
  2. Start engine. Using scan tool, access MAF PID data. If MAF PID is not 0-217.8 gram/sec., go to next step. If MAF PID is 0-217.8 gram/sec., problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
  3. Turn ignition switch off. Disconnect MAF sensor 3-pin harness connector. Check for damaged or corroded MAF sensor connector terminals. Repair as necessary, and go to step  9. If connector terminals are okay, go to next step.
  4. Turn ignition switch on, engine off. Measure voltage between MAF sensor 3-pin harness connector terminal "C" (White/Red wire) and ground. If battery voltage present, go to next step. If battery voltage is not present, repair open in White/Red wire between MAF sensor 3-pin harness connector terminal "C" and main relay. See WIRING DIAGRAMS article. Repair as necessary and go to step  9.
  5. Turn ignition switch off. Check continuity between MAF sensor harness connector terminal "A" (Black/Red wire) and ground. If continuity is present, go to next step. If continuity is not present, repair open in Black/Red wire. See WIRING DIAGRAMS article. Go to step  9.
  6. Turn ignition switch off. Disconnect PCM 104-pin harness connector. See Figure. Check for damaged or corroded PCM connector terminals. Repair as necessary, and go to step  9. If connector terminals are okay, go to next step.
  7. Check continuity of Light Green/Black wire between MAF sensor harness connector terminal "C" and PCM harness connector terminal No. 88. See Figure. If continuity is present, go to next step. If continuity is not present, repair open in Light Green/Black wire. See WIRING DIAGRAMS article. Go to step  9.
  8. Check continuity between MAF sensor harness connector terminals "C" (Light Green/Black wire) and "A" (Black/Red wire). Check continuity between ground and MAF sensor 3-pin harness connector terminal "C" (Light Green/Black wire). If continuity is present, repair or replace wire harness as necessary. If continuity is not present, go to next step.
  9. Reconnect all connectors. Start engine. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Ensure MAF PID is 0-217.8 gram/sec. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0102 is present, replace PCM and go to next step. If DTC P0102 is not present, go to next step.
  10. Cycle ignition switch from off to on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If no other DTCs are present, testing is complete. If any other DTC is present, go to applicable test and repair.
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