LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2003 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0032: Ho2S Heater (Front) Circuit - High >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify Related Repair Information Availability -  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  6.
  2. Inspect HO2S (Front) Terminals -  Turn ignition off. Disconnect front HO2S 4-pin harness connector. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. Repair as necessary, and go to step  6. If connector terminals are okay, go to next step.
  3. Inspect HO2S Heater (Front) -  Measure resistance between front HO2S 4-pin connector terminals "C" and "D". See Figure. If resistance reading is about 5.6 ohms, go to next step. If resistance reading is not as specified, replace front HO2S. After repair, go to step  6.
  4. Inspect PCM Terminal -  Turn ignition off. Disconnect PCM 104-pin harness connector. See Figure. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. Repair as necessary, and go to step  6. If connector terminals are okay, go to next step.
  5. Inspect HO2S (Front) Heater Control Circuit For Short To Power Circuit -  Turn ignition on, engine off. Check for voltage between ground and front HO2S 4-pin harness connector terminal "D" (Light Green/Red wire). See Figure. If battery voltage is not present, go to next step. If battery voltage is present, repair short circuit to power in Light Green/Red wire between front HO2S 4-pin harness connector terminal "D" and PCM 104-pin harness connector terminal No. 94. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to next step.
  6. Verify Trouble Shooting Of DTC P0032 Completed -  Reconnect all connectors. Turn ignition on, engine off. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and allow to reach normal operating temperature. Monitor for DTCs. If DTC P0032 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step. If same DTC P0032 is not present, go to next step.
  7. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
scientia non olet · About LEMON Manuals