LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2007 >> B4000 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0320: Crankshaft Position Sensor Malfunction >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda B4000, 2003 Mazda B3000, and 2003 Mazda B2300. 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. DTC P0320: Erratic Ignition -  Check for following:
    • Loose wires and connectors.
    • Arcing secondary ignition components (ignition coil, plug wires and spark plugs).
    • 2-way radio installation (if equipped). Verify 2-way radio installation regarding antenna and power lead routing. Verify equipment manufacturer's installation instructions are followed.
    If any of the above are present, repair as necessary. After repair, go to step  25 . If any of the above conditions are not present:
    • For no starts, go to step  3 .
    • For intermittent faults, see INTERMITTENT  testing under SYSTEM TESTS.
    • For all other conditions, go to next step.
  3. Check CKP(+)/CKP(-) Continuity -  Disconnect CKP sensor 2-pin harness connector and PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . Measure resistance of CKP(+) circuit between breakout box terminal No. 21 and CKP sensor harness connector (Dark Blue wire). See Fig 1 . Record reading. Measure resistance of CKP(-) circuit between breakout box terminal No. 22 and CKP sensor harness connector (Gray wire). Record reading. If each resistance reading is more than 5 ohms, repair open circuit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25 . If each resistance reading is 5 ohms or less, go to next step.
    Fig 1: Identifying CKP Sensor Harness Connector Terminals
    G00155537Courtesy of MAZDA MOTORS CORP.
  4. Check For CKP(+) Bias Voltage Fault -  Remove breakout box. Reconnect PCM 104-pin harness connector. With KOEO, measure voltage at CKP sensor harness connector between CKP(+) terminal (Dark Blue wire) and negative battery terminal. Turn ignition off. If voltage reading is one to 2 volts, go to next step. If voltage reading is not one to 2 volts, repair bias fault. After repair, go to step  17 .
  5. Check For CKP(-) Bias Voltage Fault -  With KOEO, measure voltage at CKP sensor harness connector between CKP(-) terminal (Gray wire) and negative battery terminal. Turn ignition off. If voltage reading is one to 2 volts, go to step  9 . If voltage reading is not one to 2 volts, repair bias fault. Go to next step.
  6. Determine If Bias High Or Bias Low Fault -  If bias voltage reading for CKP(-) is less than one volt, bias low condition is present. Go to next step. If bias voltage reading for CKP(-) is not less than one volt, bias high condition is present. Go to step  8 .
  7. Check For CKP(-) Short To Ground In Harness -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . Measure resistance of CKP(-) circuit between breakout box terminal No. 22 and battery negative terminal. If resistance reading is more than 10,000 ohms, replace faulty PCM. After repair, go to step  25 . If resistance reading is 10,000 ohms or less, repair short circuit in Gray wire between PCM 104-pin harness connector terminal No. 22 and CKP sensor harness connector. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25 .
  8. Check For CKP(-) Short To Power In Harness -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . Measure voltage of CKP(-) circuit between breakout box terminal No. 22 and negative battery terminal. If voltage reading is less than 0.5 volt, replace faulty PCM. After repair, go to step  25 . If voltage reading is 0.5 volt or more, repair short circuit in Gray wire between PCM 104-pin harness connector terminal No. 22 and CKP sensor harness connector. After repair, go to step  25 .
  9. Check CKP Sensor Amplitude At PCM -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . With KOEO, measure voltage of CKP(-) circuit between breakout box terminals No. 21 CKP(+) and 22 CKP(-) while cranking engine. If (settled) AC voltage reading is more than 0.4 volt, go to next step. If (settled) AC voltage reading is 0.4 volt or less, repair amplitude fault. After repair, go to step  11 .
  10. Check CKP(+) Circuit For Short To Ground At Sensor -  Measure resistance of CKP(+) circuit between breakout box terminal No. 21 and negative battery terminal. If resistance reading is more than 10,000 ohms, go to step  20 . If resistance reading is 10,000 ohms or less, go to step  15 .
  11. Check CKP Circuit Resistance For Amplitude Fault -  Measure resistance between breakout box terminals No. 21 CKP(+) and 22 CKP(-). If resistance reading is 300-800 ohms, go to step  14 . If resistance reading is not 300-800 ohms, go to next step.
  12. Determine If Resistance High Or Resistance Low Fault -  If resistance reading in previous step is less than 300 ohms, a low resistance fault is present. Go to next step. If resistance reading in previous step is not less than 300 ohms, replace faulty CKP sensor. After repair, go to next step.
  13. Check CKP(+) For Short To CKP(-) -  Disconnect CKP sensor harness connector. Measure resistance between CKP(+) (Dark Blue wire) and CKP(-) (Gray wire) at CKP sensor harness connector. If resistance reading is less than 5 ohms, repair short circuit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25 . If resistance reading is 5 ohms or more, replace faulty CKP sensor. After repair, go to step  25 .
  14. Check CKP Sensor & Pulse Wheel -  Visually inspect pulse wheel and CKP sensor for damage. If components are okay, replace faulty CKP sensor. After repair, go to step  25 . If either component is not faulty, repair or replace damaged components. After repair, go to step  25 .
  15. Check For Open Or Short In PCM -  Turn ignition off. Disconnect CKP sensor connector. Remove breakout box. Reconnect PCM 104-pin harness connector. Measure resistance between CKP(+) (Dark Blue wire) and CKP(-) (Gray wire) at CKP sensor harness connector. If resistance is 16,000-24,000 ohms, go to next step. If resistance is not 16,000-24,000 ohms, replace faulty PCM. After repair, go to step  25 .
  16. Check CKP(+) For Short To CKP(-) -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . Measure resistance between CKP(+) (Dark Blue wire) and CKP(-) (Gray wire) at CKP sensor harness connector. If resistance reading is more than 1000 ohms, replace faulty CKP sensor. After repair, go to step  25 . If resistance reading is 1000 ohms or less, repair short circuit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25 .
  17. Determine If Bias Voltage High Or Bias Voltage Low Fault -  If voltage reading in step  4 was less than one volt, a low bias fault is present. Go to next step. If voltage reading in step  4 is one volt or more, a high bias fault is present. Go to step  19 .
  18. Check CKP(+) Circuit For Short To Ground In Harness -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . Measure resistance between breakout box terminal No. 21 CKP(+) and negative battery terminal. If resistance reading is more than 10,000 ohms, replace faulty PCM. After repair, go to step  25 . If resistance reading is 10,000 ohms or less, repair short circuit in Dark Blue wire between PCM 104-pin harness connector terminal No. 21 and CKP sensor harness connector. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25 .
  19. Check CKP(+) Circuit For Short To Power In Harness -  Turn ignition off. Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure . With KOEO, measure voltage between breakout box terminal No. 21 CKP(+) and negative battery terminal. If voltage reading is less than 0.5 volt, replace faulty PCM. After repair, go to step  25 . If voltage reading is 0.5 volt or more, repair short circuit in Dark Blue wire between PCM 104-pin harness connector terminal No. 21 and CKP sensor harness connector. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25 .
  20. Visual Inspection Of Ignition System -  Visually inspect engine compartment to make sure all coils and spark plug wires are properly secured. Inspect all wiring harnesses and connectors for damaged, burned or overheated insulation and loose or broken connections. Verify battery is fully charged. Turn all electrical accessories off. If a problem is identified, repair as necessary. After repair, go to step  25 . If a problem is not identified, go to next step.
  21. DTC P0301-P0306: Misfire On Specific Cylinder -  If any of these DTC's are present, go to DTC P0300, DTC P0301, DTC P0302, DTC P0303, DTC P0304, DTC P0305, DTC P0306 OR DTC P0316  . If these DTC's are not present, go to next step.
  22. Check For Spark At All Cylinders -  Disable IFS switch. Check for spark at each cylinder while cranking engine. If a Bluish/White spark is consistent between all cylinders, turn ignition off. Go to next step. If a Bluish/White spark is not consistent between all cylinders, turn ignition off. Inspect spark plug wires. Measure resistance of spark plug wires and replace if more than 7000 ohms per foot is present. After repair, go to step  25 .
  23. Check Spark Plugs -  Remove and inspect all spark plugs for damage, wear, carbon deposits and proper gap. If spark plugs are okay, go to next step. If spark plugs are not okay, repair spark plugs or adjust gap. Replace if necessary. After repair, go to step  25 .
  24. Check Spark Plug Resistance -  Measure resistance of each spark plug. If resistance reading is 2000-20,000 ohms, fault is intermittent. See DTC P0136, P1137 OR P1138  . If resistance reading is not 2000-20,000 ohms, replace spark plugs as necessary. After repair, go to next step.
  25. Verify Trouble Shooting Of DTCs Completed -  Make sure all electrical connectors are reconnected. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If the same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any other DTC is present, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no DTCs are present, test is complete.
scientia non olet · About LEMON Manuals