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Home › Mazda › 2003 › B4000 Base, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P1132 Or DTC P1152 › Diagnostic Procedures

Diagnostic Procedures

  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 leaks and damage. Verify integrity of PCV system. Check for vacuum leaks. If any problems are found, repair as necessary. After repair, go to step  17 . If no problems are found, go to next step.
  3. Perform KOER Self-Test -  Disconnect fuel vapor hose from intake manifold. Plug fitting at intake manifold. Start engine and run at 2000 RPM for 5 minutes, then return to idle. Perform KOER Self-Test. If DTC P1132 and/or P1152 are set, go to next step. If DTC P1132 and/or P1152 are not set, perform EVAP Leak Test to locate EVAP system leak. See 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:
    • P1132, HO2S11 (Front Right)
    • P1152, HO2S21 (Front Left)
    With KOEO, using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access and observe O2S11 (Front Right) or O2S21 (Front Left) PID. If voltage reading is 0.2 volt or less, go to step  6 . If voltage reading is more than 0.2 volt, a short to power is present. Go to next step.
  5. Check For Shorts To Voltage Source In Harness Circuit -  Turn ignition off. Disconnect scan tool form 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 terminals No. 60 and 71 (VPWR circuit) and between terminals No. 60 and 93 (HTR11 circuit).
    • For DTC P1132, measure resistance between breakout box terminals No. 87 and 71 (VPWR circuit) and between terminals No. 87 and 94 (HTR21 circuit).
    If resistance reading is more than 10,000 ohms, replace faulty PCM. After repair, go to step  17 . If resistance reading is 10,000 ohms or less, replace faulty HO2S. After repair, go to step  17 .
  6. Check For HO2S Signal Shorted To HO2S Heater Circuit In Sensor -  Reconnect suspect HO2S 4-pin harness connector. With KOEO, using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access O2S11 (Front Right) or O2S21 (Front Left) PID. If HO2S voltage reading is more than 0.45 volt, replace faulty HO2S. After repair, go to step  17 . If HO2S voltage reading is .045 volt or less, reconnect all components. Go to next step.
    WARNING: Fuel system retains fuel pressure with engine not running. Use caution when working on fuel system.
  7. Check Fuel Pressure -  Install fuel pressure gauge. With KOEO, 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. Fuel pump will run for about 8 seconds when OUTPUT TEST MODE is activated. Fuel pressure should be 56-72 psi (389-499 kPa). If fuel pressure reading is within specification, fuel system is okay. Go to next step. If fuel pressure reading is not within specification, see FUEL DELIVERY SYSTEM  testing under SYSTEM TESTS.
  8. Check Injector Fault PIDs -  Using scan tool, access INJ1F-INJ6F PIDs. If an injector fault is present, go to next step. If an injector fault is not present, go to step  17 .
    9. NOTE: Next test step erases Continuous Memory DTCs.
    Fig 1: Fuel Injector Harness Connector Circuit Identification
    G00155536Courtesy of MAZDA MOTORS CORP.
  9. Check Fuel Injector(s) & Harness Resistance -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . Use injector fault PID to determine which fuel injector(s) to test. Measure resistance of suspect fuel injector between INJ circuit and breakout box terminal No. 71 (VPWR circuit). See Fig 1 . Fuel injector resistance should be 11-18 ohms. If resistance reading is within specification, replace faulty 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 2-pin harness connector at suspect fuel injector. Measure resistance of VPWR circuit between breakout box terminal No. 71 and fuel injector harness connector. See Fig 1 . Record reading. Measure resistance of INJ circuit between appropriate breakout box terminal and fuel injector harness connector. See Fig 1 . Record reading. If each resistance reading is less than 5 ohms, go to next step. If either resistance reading is 5 ohms or more, repair open circuit in wiring harness. 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 harness connector and breakout box terminal No. 71. See Fig 1 . Record reading. Measure resistance between suspect INJ circuit harness connector and breakout box terminal No. 103. See Fig 1 . Record reading. If each resistance reading is more than 10,000 ohms, go to next step. If either resistance reading is 10,000 ohms or less, repair short circuit. After repair, go to step  17 .
  12. Flow Test Fuel Injector(s) -  Using a fuel injector tester, flow test fuel injectors following equipment manufacturers instructions. See FUEL INJECTOR FLOW RATE SPECIFICATIONS  table. If flow rate values are within specification, go to next step. If flow rate values are not within specification, replace faulty fuel injector(s). After repair, go to step  17 .
    FUEL INJECTOR FLOW RATE SPECIFICATIONS

    Engine Lbs. Hr. (kg/hr)
    2.3L 21 (9.6)
    3.0L 12 (5.5)
    4.0L 19 (8.7)
  13. Attempt To Generate DTCs P1131 & P1151 -  Disconnect suspect HO2S 4-pin harness connector. Connect fused jumper wire between HO2S 4-pin harness connector SIG circuit and negative battery terminal. See Fig 2 . With KOEO, perform Self-Test. If DTCs P1131 or P1151 are present, remove fused jumper wire. Go to next step. If DTCs P1131 or P1151 are not present, remove fused jumper wire. Reconnect HO2S 4-pin harness connector. Disconnect PCM 104-pin harness connector. Inspect PCM 104-pin harness connector for damaged or pushed out pins, corrosion or loose wires. Repair as necessary. If PCM connector is okay, replace faulty PCM. After repair, go to step  17 .
    Fig 2: HO2S Harness Connector Circuit Identification
    G95E35968Courtesy of MAZDA MOTORS CORP.
  14. HO2S Check -  Connect DVOM to HO2S 4-pin connector SIG circuit and SIG RTN circuit. Disconnect any vacuum hose. Start engine and run at 2000 RPM. Observe voltage. If voltage reading is less than 0.4 volt within 30 seconds, reconnect vacuum hose. Go to next step. If voltage reading is not less than 0.4 volt within 30 seconds, replace faulty HO2S. After repair, go to next step.
  15. Monitor HO2S PID For Proper Switching -  With KOER and engine at operating temperature, using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. ACCESS O2S11 -(Front Right) or O2S21 (Front Left) PID while wiggling, bending and shaking small sections of engine wiring harness from HO2S to PCM. Turn ignition off. If HO2S voltage reading stays high (more than 0.45 volt) or stays low (less then 0.45 volt), isolate cause of HO2S not switching. Repair as necessary. After repair, go to step  17 . If HO2S voltage reading does not stay high (more than 0.45 volt) or stay low (less then 0.45 volt), go to next step.
    16. NOTE: Next test step requires a helper to monitor PID.
  16. Test Drive While Monitoring HO2S PID For Proper Switching -  Using scan tool, access O2S11 (Front Right) or O2S21 (Front Left) PID. While observer monitors PID, test drive vehicle under different road conditions in an attempt to simulate original fault. If HO2S appears to properly switch, unable to duplicate fault at this time. Go to next step. If HO2S does not appear to properly switch, replace faulty HO2S. After repair, go to next step.
  17. Verify Trouble Shooting Of DTCs Completed -  Reconnect all electrical connectors. Clear DTC from PCM memory. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTC is present, trouble shooting is complete.
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