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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0102, DTC P0103, DTC P1100 & DTC P1101 >> Diagnostic Procedure

Diagnostic Procedure

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. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If DTCs were detected, proceed as follows:
    • KOER DTC P1101, go to next step.
    • KOEO DTC P1101, go to step  4.
    • DTC P1100, go to step  12.
    • DTC P0102, go to step  3.
    • DTC P0103, go to step  14.
  2. DTC P1101: Check For MAF/IAT Sensor Continuous Memory DTCs -  Using scan tool, clear DTC. See CLEARING CODES  under SELF-DIAGNOSTIC SYSTEM. Drive vehicle for 6-10 minutes. Retrieve Continuous Memory DTCs. If no Continuous Memory DTCs are present with KOER DTC P1101, turn ignition off and go to step  4. If any Continuous Memory DTCs are present with KOER DTC P1101, proceed as follows:
    • For Continuous Memory DTC P0102, go to next step.
    • For Continuous Memory DTC P0103, go to step  14.
    • All other Continuous Memory DTCs, service DTCs as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  3. DTC P0102: Low MAF/IAT Sensor Signal Input To PCM -  Check for broken or loose air outlet tube clamps at throttle body and air cleaner assembly. Check for worn gaskets and holes/cracks in air outlet tube between MAF/IAT sensor and air cleaner. Repair as necessary. If no problems are detected, start engine and allow to idle. Check for DTCs. If KOER DTC P0505 is present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . On A/T models, if engine stalls or cannot maintain idle speed, go to step  6. If KOER DTC P0505 is not present and engine idles okay, increase engine speed to 1500 RPM for 5 seconds, then return to idle. Using scan tool, select MAF/IAT V PID from PID/DATA MONITOR & RECORD menu. If MAF/IAT V PID voltage is less than .23 volt, turn ignition off and go to step  5. If MAF/IAT V PID voltage is .23 volt or more, go to next step.
    4. NOTE: DTC P1101 can be generated by a low charged battery or poor garage exhaust ventilation system. Repair as necessary and rerun KOEO Self-Test.
  4. DTC P1101: Check For MAF/IAT Sensor Signal Out Of Self-Test Range -  Ensure MAF/IAT sensor 6-pin harness connector is connected. If not, repair as necessary. With KOER, access MAF/IAT V PID. If MAF/IAT V PID value is 0.46-2.44 volts, problem is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS. If MAF/IAT V PID value is not as specified, go to next step.
  5. Check VPWR Voltage To MAF/IAT Sensor -  Turn ignition off. Disconnect MAF/IAT sensor 6-pin harness connector. With KOEO, measure voltage between negative battery terminal and MAF/IAT sensor 6-pin harness connector VPWR terminal (White/Red wire). See Fig 1. If voltage reading is more than 10.5 volts, go to next step. If voltage reading is 10.5 volts or less, repair open circuit in White/Red wire between MAF/IAT sensor 6-pin harness connector VPWR terminal 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.
  6. Check MAF/IAT Circuit Short To PWR GND Or MAF/IAT RTN In Harness -  Disconnect PCM 104-pin harness connector. Disconnect scan tool from DLC. Using DVOM, measure resistance between MAF/IAT sensor 6-pin harness connector MAF/IAT terminal (Blue/Red wire) and PWR GND terminal (Black wire). See Fig 1. Measure resistance between MAF/IAT terminal (Blue/Red wire) and MAF/IAT RTN terminal (Tan/Light Blue wire) at MAF/IAT sensor 6-pin harness connector. If resistance reading is more than 10,000 ohms, go to next step. If resistance reading is not as specified, repair short in affected circuit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  17.
  7. Check MAF/IAT RTN Circuit For Short To PWR GND In Harness -  Measure resistance between MAF/IAT sensor 6-pin harness connector MAF/IAT RTN terminal (Tan/Light Blue wire) and PWR GND terminal (Black wire). If resistance reading is more than 10,000 ohms, go to next step. If resistance reading is 10,000 ohms or less, repair short in affected circuit. After repair, go to step  17.
  8. Check MAF/IAT Circuit Voltage Cycling Integrity -  Reconnect PCM 104-pin harness connector and reconnect scan tool to DLC. With KOEO, access MAF/IAT V PID and record reading. Connect fused jumper wire between MAF/IAT sensor 6-pin harness connector MAF/IAT RTN terminal (Tan/Light Blue wire) and PWR GND terminal (Black wire). See Fig 1. Connect another fused jumper wire between MAF/IAT sensor 6-pin harness connector MAF/IAT terminal (Light Blue/Red wire) and VPWR terminal (White/Red wire). Compare MAF/IAT V PID voltage readings. If MAF/IAT V PID voltage reading changes from less than .23 volt (closer to zero volt) to more than 4.5 volts, replace MAF/IAT sensor. After repair, go to step  17. If MAF/IAT V PID voltage reading does not change as specified, proceed as follows:
    • If DTC P0102 is only DTC present, go to next step.
    • If DTC P1101 is present without DTC P0102, go to step  10.
  9. Check MAF/IAT Circuit For Open In Harness -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Using DVOM, measure resistance between MAF/IAT sensor 6-pin harness connector MAF/IAT terminal (Light Blue/Red wire) and breakout box terminal No. 88. If resistance reading is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit in Light Blue/Red wire between MAF/IAT sensor 6-pin harness connector MAF/IAT terminal and PCM 104-pin harness connector terminal No. 88. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  17.
  10. Check PWR GND Circuit For Open In Harness -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Disconnect scan tool from DLC. Using DVOM, measure resistance between battery ground terminal and MAF/IAT sensor 6-pin harness connector PWR GND terminal (Black wire). If resistance reading is less than 10,000 ohms, go to next step. If resistance reading is 10,000 ohms or more, repair open circuit in Black wire between MAF/IAT sensor 6-pin harness connector PWR GND terminal and ground. After repair, go to step  17.
  11. Check MAF/IAT RTN Circuit For Open In Harness -  Measure resistance between MAF/IAT sensor 6-pin harness connector MAF/IAT RTN terminal (Tan/Light Blue wire) and PCM 104-pin harness connector terminal No 36. If resistance reading is less than 5 ohms, replace PCM. After repair, go to step  17. If resistance reading is 5 ohms or more, repair open circuit in Tan/Light Blue wire between MAF/IAT sensor 6-pin harness connector MAF/IAT RTN terminal and PCM 104-pin harness connector terminal No 36. After repair, go to step  17.
  12. DTC P1100: Check MAF/IAT Circuit For Intermittent Voltage To PCM -  Start engine and allow to idle. If idle is not at least 700 RPM and stable, see LOW IDLE OR ENGINE STALLS DURING DECELERATION under SYMPTOM DIAGNOSIS in TROUBLE SHOOTING - NO CODES article. Increase engine speed to 1500 RPM for 5 seconds, then return to idle. Using scan tool, access MAF/IAT V PID. While observing MAF/IAT V PID, lightly tap on MAF/IAT sensor and wiggle sensor 6-pin harness connector to simulate road shock. If MAF/IAT V PID reading changes to less than .23 volt (minimum) or to more than 4.6 volts (maximum), inspect MAF/IAT sensor 6-pin harness connector. Repair connector as necessary. If connector is okay, replace MAF/IAT sensor. After repair, go to step  17. If MAF/IAT V PID reading does not change as specified, go to next step.
  13. Check MAF/IAT Circuit For Intermittent Opens Or Shorts -  Turn ignition on, engine off. Using scan tool, access MAF/IAT V PID. While observing MAF/IAT V PID, wiggle small sections of wiring harness starting at MAF/IAT sensor 6-pin harness connector working toward PCM 104-pin harness connector. If MAF/IAT V PID reading changes to less than .23 volt (minimum) or to more than 4.6 volts (maximum), repair wiring harness as necessary. After repair, go to step  17. If MAF/IAT V PID reading does not change as specified, problem is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS.
    14. NOTE: DTC P0103 can be generated by foreign material blocking MAF/IAT sensor screen, causing airflow restriction. If contaminants are found, ensure air induction system is okay. Repair if necessary. After repair, recheck for DTCs.
    Fig 1: Identifying Mass Airflow/Intake Air Temperature (MAF/IAT) Sensor 6-pin Harness Connector & Circuits
    G99E02082Courtesy of FORD MOTOR CO.
  14. DTC P0103: Check MAF/IAT Sensor Signal High Input To PCM -  Start engine and allow to idle. If KOER DTC P0505 is present, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . Increase engine speed to 1500 RPM for 5 seconds then return to idle. Using scan tool, access MAF/IAT V PID. MAF/IAT V PID reading should be more than 4.6 volts. Record MAF/IAT V PID reading. Turn ignition off. Disconnect MAF/IAT sensor 6-pin harness connector. Connect fused jumper wire between MAF/IAT sensor 6-pin harness connector PWR GND terminal (Black wire) and MAF/IAT RTN terminal (Tan/Light Blue wire). See Fig 1. Start engine and allow to idle. Access MAF/IAT V PID. If MAF/IAT V PID reading does not drop from previous MAF/IAT V PID reading to less than .23 volt, turn ignition off, remove fused jumper wire and go to next step. If MAF/IAT V PID reading drops from previous MAF/IAT V PID reading to less than .23 volt, turn ignition off. Remove fused jumper wire and replace MAF/IAT sensor. After repair, go to step  17.
  15. Check MAF/IAT Circuit For Short To VPWR In Harness -  Disconnect PCM 104-pin harness connector. Connect breakout box to PCM harness connector only. Turn ignition on, engine off. Measure voltage between breakout box terminal No. 88 (MAF/IAT) and terminals No. 51, 77 and 103 (PWR GND). If voltage reading is less than one volt, go to next step. If voltage reading is one volt or more, repair MAF/IAT circuit short to VPWR circuit. After repair, go to step  17.
  16. Check MAF/IAT Circuit For Short To VREF In Harness -  Turn ignition off. Measure resistance between breakout box terminals No. 88 (MAF/IAT) and No. 90 (VREF). If resistance reading is more than 10,000 ohms and idle concern is not present, replace PCM. After repair, go to next step. If problem was not detected and an idle concern is still present, disregard DTC P0102 at this time. Go to next step.
  17. Verify Trouble Shooting Of DTCs Is Completed -  Reconnect all disconnected connectors. Using scan tool, clear DTCs from PCM memory. See CLEARING CODES  under SELF-DIAGNOSTIC SYSTEM. Perform PCM Quick Test. See QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace PCM. After repair, repeat PCM Quick Test. If any other DTC is present, go to appropriate DTC inspection. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no other DTCs are present, testing is complete.
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