DTC P1621 Control Module Long Term Memory Performance (4JJ3 with DPD)

1. DTC P1621 description

The learning data, VIN data, and immobilizer security information is stored in the EEPROM inside the ECM. If the ECM detects an error in any data, the DTC is set.

2. Condition for setting DTC P1621

Condition for setting the DTC

  • The ECM detects an error in the learning data stored in the internal EEPROM.

3. Action taken when DTC P1621 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".

4. Condition for clearing DTC P1621

  • 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".

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