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Home >> Mazda >> 2000 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1608: Powertrain Control Module (Pcm) Malfunction >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Check service bulletins. Go to next step.
  2. Disconnect the following component connectors and check for voltage between harness connector terminals listed and ground:
    • Purge solenoid valve terminal "B" (Brown/Red wire).
    • EGR valve terminal "E" (Violet wire).
    • EGR valve terminal "A" (White/Green wire).
    • EGR valve terminal "B" (Pink/Black wire).
    • EGR valve terminal "F" (Pink wire).
    • VICS solenoid valve terminal "B" (White/Blue wire).
    • EGR boost sensor solenoid valve terminal "B" (Gray wire).
    • CDCV terminal "B" (Blue/Orange wire).
    If no voltage is present, go to next step. If voltage is present, repair short to power on affected circuit. Go to next step.
  3. Connect all connectors. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Start engine. If same DTC is not present, go to next step. If same DTC is present, replace PCM. Go to next step.
  4. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. If any DTC is present, go to appropriate test. If no DTC is present, test is complete.
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