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Home >> Mazda >> 2000 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1601: Communication Line Error (Automatic Transmission) >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check service bulletins. Go to next step.
  2. Turn ignition off. Using scan tool, RTQ1 and RTQ2 PIDs. Drive vehicle. Upshift and downshift transmission. If PIDs don't change, go to next step. If PIDs change, go to step  8.
  3. Turn ignition off. Disconnect PCM connectors. Inspect PCM harness connector terminals. If no problem is found, go to next step. If any terminal is faulty, repair as necessary and go to step  8.
  4. Turn ignition on. Check voltage between PCM connector No. 1 terminal "N" (Pink/Black wire) and ground. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, check for open or short on Pink/Black wire. Repair as necessary and go to step  8.
  5. Turn ignition off. disconnect TCM connector. Inspect TCM harness connector terminals. If no problem is found, go to next step. If any terminal is faulty, repair as necessary and go to step  8.
  6. Connect TCM connector. Disconnect PCM connectors. Turn ignition on. Check voltage between TCM connector terminal AL (Violet/Green wire) and ground. If voltage is 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, check for open or short on Violet/Green wire. Repair as necessary and go to step  8.
  7. Turn ignition off. Connect all connectors. Using scan tool, check TCM DTCs and voltage. If TCM is okay, go to next step. If any problem is present, replace TCM. Go to next step.
  8. 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.
  9. 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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