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Home >> Mazda >> 2003 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0600: Communication Line Error - Pcm/TCM >> Diagnostic Procedure

Diagnostic Procedure

  1. Verify Related Repair Information Availability -  Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  7.
  2. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 31-pin harness connector. Check for poor connection at PCM connector terminals due to damaged, pulled-out pins, corrosion, etc. If connector terminals are okay, go to next step. If connector terminals are found faulty, repair or replace as necessary. After repair, go to step  7.
  3. Check Serial Communication Circuit At PCM Connector -  Turn ignition off. Disconnect PCM 31-pin harness connector. Turn ignition on, engine off. Measure voltage between ground and PCM 31-pin harness connector terminal "4Z" (Pink/Black wire). Voltage reading should be 4.5-5.5 volts. If voltage reading is as specified, go to next step. If voltage reading is not as specified, check for open or short in Pink/Black wire between PCM 31-pin harness connector terminal "4Z" and TCM 36-pin harness connector terminal "O". Repair or replace as necessary. After repair, go to step  7.
  4. Inspect TCM Connector For Poor Connection -  Turn ignition off. Disconnect TCM 36-pin harness connector. Check for poor connection at TCM connector terminals due to damaged, pulled-out pins, corrosion, etc. If connector terminals are okay, go to next step. If connector terminals are found faulty, repair or replace as necessary. After repair, go to step  7.
  5. Inspect Serial Communication Circuit At TCM Connector -  Turn ignition off. Reconnect PCM 31-pin harness connector. Turn ignition on, engine off. Measure voltage between ground and TCM 36-pin harness connector terminal "AL" (Violet/Green wire). If voltage reading is 4.5-5.5 volts, go to next step. If voltage reading is as specified, go to next step. If voltage reading is not as specified, check for open or short circuit in Violet/Green wire between TCM 36-pin harness connector terminal "AL" and PCM 31-pin harness connector terminal "4AC". After repair, go to step  7.
  6. Inspect TCM -  Turn ignition off. Reconnect TCM 36-pin harness connector. Perform TCM DTC inspection and voltage inspection. See appropriate article in AUTOMATIC TRANSMISSIONS. If TCM is okay, go to next step. If TCM if faulty, replace TCM. After repair, go to next step.
  7. Verify Troubleshooting Of DTC P0600 Completed -  Return vehicle to original condition. Using scan tool, clear DTCs from PCM memory. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and let idle until normal operating temperature is reached. Monitor for DTCs. If same DTC is not present, go to next step. If same DTC P0600 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step.
  8. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, go to applicable test and repair.
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