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Home >> Mazda >> 2000 >> Millenia Base, 2.3 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.3L >> Diagnostic Trouble Code Tests >> DTC P1402: EGR Valve Position Sensor, Open Or Short Circuit >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID DATA has been recorded. Inspect all applicable harness connectors. Repair as needed. If all connectors are okay, go to next step.
  2. Using scan tool, access PID/DATA MONITOR. Record PID data for EGRP V. Compare reading with specification. See PIN VOLTAGE/PID VALUE CHARTS article. If data is not within specification, go to next step. If data is within specification, go to step  7 .
  3. Disconnect EGR valve position sensor harness connector. Measure voltage between ground and terminal "B" (Light Green/Red wire). See Figure . If 5 volts is present, go to next step. If 5 volts is not present, check for open or short in Light Green/Red wire.
  4. Turn ignition off. Disconnect PCM harness connector. PCM is mounted in front of center console, under radio. Check continuity of Black/Yellow wire between terminal "A" on EGR valve position sensor harness connector and terminal No. 3AB on PCM harness connector. See Figure and Figure . If continuity exists, go to next step. If continuity does not exist, repair Black/Yellow wire.
  5. Check continuity off Red/Black wire between terminal "C" on EGR boost sensor harness connector and terminal No. 3R on PCM harness connector. See Figure and Figure . If continuity exists, go to next step. If continuity does not exist, repair Red/Black wire.
  6. Inspect EGR valve position sensor. See appropriate SYSTEM & COMPONENT TESTING article. Replace as needed. If EGR valve position sensor is okay, go to next step.
  7. Erase DTCs. See CLEARING CODES in appropriate SELF-DIAGNOSTICS - INTRODUCTION article. If DTC resets, replace PCM. If DTC is not present, intermittent poor harness connection may have caused DTC to originally set.
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