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Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0600 [ATX] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or online repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnostic according to the available repair information
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
2 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect PCM connector.
  • Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
  • Is there any malfunction?
 Yes Repair or replace the terminal, go to Step 7.
No Go to the next step.
3 CHECK SERIAL COMMUNICATION CIRCUIT AT PCM CONNECTOR 
  • Turn the ignition switch off.
  • Disconnect PCM connector
  • Turn ignition key to ON (Engine off).
  • Measure voltage between PCM terminal 4Z (harness-side) and body GND.
  • Is voltage within 4.5-5.5 V  ?
 Yes Go to the next step.
No Check for open circuit or short circuit between PCM terminal 4Z and TCM terminal O, go to Step 7.
4 INSPECT TCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect TCM connector.
  • Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
  • Is there any malfunction?
 Yes Repair or replace the terminal, go to Step 7.
No Go to the next step.
5 INSPECT SERIAL COMMUNICATION CIRCUIT AT TCM CONNECTOR 
  • Turn the ignition switch off.
  • Connect PCM connector.
  • Disconnect TCM connector.
  • Turn ignition key to ON (Engine off).
  • Measure voltage between TCM terminal AL (harness-side) and body GND.
  • Is voltage within 4.5-5.5 V  ?
 Yes Go to the next step.
No Check for open circuit or short circuit between TCM terminal AL and PCM terminal 4AC, go to Step 7.
6 INSPECT TCM 
  • Turn the ignition switch off.
  • Connect all connector.
  • Perform TCM DTC Inspection and voltage Inspection.
  • Is TCM okay?
 Yes Go to the next step.
No Replace TCM, go to Step 7.
7 VERIFY TROUBLESHOOTING OF DTC P0600 COMPLETED 
  • Make sure to connect all disconnected connectors.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Start engine.
  • Is same DTC present?
 Yes Replace PCM, go to the next step.
No Go to the next step.
8 VERIFY AFTER REPAIR PROCEDURE  Yes Go to the applicable DTC inspection.
(See DTC TABLE .)
No Troubleshooting completed.
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