DB5 - Continuous Memory Code 337: Verify Condition

Continuous Memory Diagnostic Trouble Code (DTC) 337 indicates that sometime in the last 80 warm-up cycles, the EGR Temperature (EGRT) sensor signal was greater than the Self-Test maximum.

Possible Causes:
- Damaged EGRT sensor.

- Open harness circuit.

- Damaged Powertrain Control Module (PCM).

- Key "OFF".

- Clear continuous memory. Clearing Diagnostic Trouble Codes

- Start engine and run for at least two minutes.

- Turn engine "OFF" and rerun Key On Engine Off (KOEO) Self-Test.

- Is Continuous Memory DTC 337 still present?

Yes -- Go to DB6. DB6 - Check EGRT Circuit For Shorts to Power

No -- Go to DB90. DB90 - Check EEC-IV Vehicle Harness