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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.
  2. DTCS P1132, P1152: Upstream HO2S(s) Not Switching -  Check air intake system for obstructions or damage. Verify PCV system for proper hose routing. See POSITIVE CRANKCASE VENTILATION SYSTEM  testing under SYSTEM TESTS. Check air cleaner element and air cleaner housing for blockage. If any problems are present, repair as necessary. After repair, go to step  17. If problems are not present, go to next step.
  3. Perform KOER Self-Test -  Disconnect fuel vapor hose from intake manifold and plug fitting at intake manifold. Start engine and run at 2000 RPM for 5 minutes and return to idle. Perform KOER self-test. If DTC P1132 and/or P1152 is present, go to next step. If DTC P1132 and/or P1152 are not present, purge solenoid valve may be stuck open. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST under FUEL EVAPORATIVE SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - B2300, B3000, B4000 & TRIBUTE article.
  4. HO2S Circuit Test (With Rich DTCs) -  Turn ignition off. Disconnect suspect HO2S 4-pin harness connector related to DTC.
    • DTC P1132: HO2S11 (Front Bank 1).
    • DTC P1152: HO2S21 (Front Bank 2).
    Start engine. Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PIN/DATA MONITOR AND RECORD. Access O2S11 (Front Bank 1) or O2S21 (Front Bank 2) PID. If voltage reading is 0.2 volt or less, go to step  6. If voltage reading is not as specified, go to next step.
  5. Check For Shorts To Voltage Source In Harness Circuit -  Turn ignition off. Disconnect scan tool from DLC. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure.
    • For DTC P1132, measure resistance between breakout box terminal No. 60 and terminals No. 71 (VPWR) and No. 93 (HTR11).
    • For DTC 1152, measure resistance between breakout box terminal No. 87 and terminals No. 71 (VPWR) and No. 94 (HTR21).
    If resistance reading is more than 10,000 ohms, replace PCM. After repair, go to step  17. If resistance reading is not as specified, replace HO2S. After repair, go to step  17.
  6. Check For HO2S Signal Shorted To HO2S Heater Circuit In Sensor -  Reconnect suspect HO2S sensor 4-pin harness connector. Turn ignition on, engine off. Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access O2S11 (Front Bank 1) or O2S21 (Front Bank 2) PID. If HO2S voltage reading is more than 0.45 volt, replace HO2S. After repair, go to step  17. If voltage reading is not as specified, go to next step.
    7. WARNING: Fuel system is pressurized when engine is not running. To prevent injury or fire, use caution when working on fuel system.
    NOTE: During next step, fuel pump will only operate for about 8 seconds when OUTPUT TEST MODE is selected and activated.
  7. Check Fuel Pressure -  Install fuel pressure gauge. Turn ignition on, engine off. Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select ACTIVE COMMAND MODES. Access OUTPUT TEST MODE and run fuel pump to obtain maximum fuel pressure. If fuel pressure is 55-70 psi (380-472 kPa), go to next step. If fuel pressure is not as specified, refer to FUEL DELIVERY SYSTEM  testing under SYSTEM TESTS.
  8. Check Injector Fault PIDs -  Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access INJ1F-INJ6F PIDs. If an injector(s) fault is present, go to next step. If an injector fault is not present, go to step  17.
    9. NOTE: Performing following procedure erases Continuous Memory DTCs.
    NOTE: Use injector fault PID to determine fuel injector circuit(s) requiring testing.
  9. Check Fuel Injector(s) & Harness Resistance -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance of suspect fuel injector between suspect INJ circuit breakout box terminal and breakout box terminal No. 71 (VPWR). If resistance reading is 11-18 ohms, replace PCM. After repair, go to step  17. If resistance reading is not within specification, go to next step.
  10. Check Fuel Injector Harness Resistance -  Disconnect fuel injector harness connector at suspect fuel injector. Measure resistance of VPWR circuit (Red wire) between breakout box terminal No. 71 and fuel injector harness connector. Measure resistance of INJ circuit between appropriate breakout box terminal and fuel injector harness connector. See Figure. If each resistance reading is less than 5 ohms, go to next step. If each resistance reading is not as specified, repair open circuit in Red wire between suspect fuel injector harness connector and PCM 104-pin harness connector terminal No. 71. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  17.
  11. Check Fuel Injector Harness Circuit For Short To Power & Ground -  Measure resistance between suspect INJ circuit breakout box terminal and breakout box terminal No. 71 (VPWR). Measure resistance between suspect INJ circuit breakout box terminal and breakout box terminal No. 103 (PWR GND). If each resistance reading is more than 10,000 ohms, go to next step. If each resistance reading is not as specified, repair short circuit. After repair, go to step  17.
  12. Flow Test Fuel Injector(s) -  Using a fuel injector tester, flow test fuel injectors according to instructions for tester. Flow rate should be 17 lb/hr (7.8 kg/hr) for 2.0L engines and 22 lb/hr (10.1 kg/hr) for 3.0L engines. If leakage and flow are within specification, go to next step. If leakage and flow are not within specification, replace fuel injector(s). After repair, go to step  17.
  13. Attempt To Generate DTCS P1131 & P1151 -  Disconnect suspect HO2S 4-pin harness connector. Install fused jumper wire between negative battery post and HO2S 4-pin harness connector HO2S SIG terminal. Perform KOER self-test. If DTCs P1131 or P1151 are present, remove fused jumper wire and go to next step. If DTCs P1131 or P1132 are not present, remove fused jumper wire. Reconnect HO2S 4-pin harness connector. Disconnect PCM 104-pin harness connector. Inspect both ends for damaged or pushed out terminals, corrosion and loose wires. Repair as necessary. If connector, terminals and wiring are okay. Replace PCM. After repair, go to step  17.
  14. HO2S Check -  Connect DVOM to HO2S SIG and HO2S SIG RTN terminals at HO2S sensor 4-pin connector. See Figure. Disconnect any vacuum hose. Start engine and run at 2000 RPM. If voltage reading indicates less than 0.4 volt within 30 seconds, reconnect vacuum line and go to next step. If voltage reading is not as specified, replace HO2S. After repair, go to step  17.
  15. Monitor HO2S (PID) For Proper Switching -  Start engine. Warm up engine to operating temperature. Using scan, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access O2S11 (Front Bank 1) or O2S21 (Front Bank 2) PID and monitor while wiggling, bending and shaking small sections of engine harness from HO2S to PCM. Turn ignition off. If HO2S voltage reading did not stay high (more than 0.45 volt) or low (less than 0.45 volt), go to next step. If HO2S voltage reading stayed high or low, isolate cause for lack of switching and repair as necessary. After repair, go to step  21.
    16. NOTE: Following step requires an observer to monitor PID for proper operation.
  16. Test Drive While Monitoring HO2S PID For Proper Switching -  Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access O2S11 (Front Bank 1) or O2S21 (Front Bank 2) PID. While observer views PID, test drive vehicle under different road conditions in an attempt to simulate original fault. If HO2S appears to switch properly, unable to duplicate problem. Go to next step. If HO2S does not appear to switch properly, replace HO2S. After repair, go to next step.
  17. Verify Trouble Shooting Of DTCs Completed -  Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is not present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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