DTC Troubleshooting: P0512 (137-2)
DTC P0512:
 Starter Signal Circuit Malfunction
NOTE: If the engine is started without using the starter switch, DTC P0512 is stored.
  1. Turn the ignition switch to ON (II).
  1. Clear the DTCs with the HDS.
  1. Start the engine.
  1. Check for DTCs with the HDS.
Is DTC P0512 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the clutch actuator subharness 10P connector from the engine compartment wire harness.
  1. Turn the ignition switch to START (III).
  1. Measure the voltage between clutch actuator subharness 10P connector terminal No. 4 and body ground.
Is there battery voltage?
YES -
Remove the clutch actuator assembly; R18A2 engine model, L13Z1 engine model, then check for the clutch actuator subharness, if the wire harness is OK, update the TCM if it does not have the latest software, or substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM; R18A2 engine model, L13Z1 engine model. ■
NO -
Repair an open in the wire between the starter switch and the TCM.■