DTC P0601 Internal Control Module Memory Check Sum Error (4JJ3 with DPD)

1. DTC P0601 description

This diagnosis applies to the microprocessor inside the ECM.

2. Condition for setting DTC P0601

Condition for setting the DTC

  • The ECM detects that the calculated checksum does not match the checksum registered in the ROM.

3. Action taken when DTC P0601 sets

  • The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type A.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".

  • The ECM stops the engine.
  • The ECM inhibits engine startup.
  • The ECM inhibits pre-injection.
  • The ECM limits the fuel rail pressure.
  • The ECM inhibits the cruise control.

4. Condition for clearing DTC P0601

  • Refer to Conditions for clearing the MIL/DTC - Type A or Type B.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".