DDEC III/IV Single ECM Troubleshooting – Section 39.3 Troubleshooting Flash Code 39

Section 39.3
Troubleshooting Flash Code 39

The following procedure will troubleshoot Flash Code 39. For all EGR related codes, always perform the basic checks in EGR-1. Performing the basic checks will troubleshoot the components that will be responsible for logging these codes for Series 50 engines. Refer to "10.16 Exhaust Gas Recirculation System (EGR-1) – Fault, Series 50 Engine" . For Series 60 engines, refer to "10.18 Exhaust Gas Recirculation System Basic Checks for Series 60 Engines" .‪

If the basic checks all pass, and no fault can be found with the VNT/turbocharger or EGR valve, then it is recommended that the information you have collected be available to discuss with Detroit Diesel Technical Service. ‪

1. Code s 146/7 — occurs if actual EGR rate during EGR mode operation is less than it should be. This fault will lock boost mode operation and illuminate the CEL for the remainder of the ignition cycle.
2. Code s 146/2 — occurs if actual EGR rate during Power Boost mode operation is greater than a calibrated value. This fault will illuminate the CEL for the duration of the fault being active.
3. Code s 146/12 — occurs if actual EGR rate during Boost Jake mode operation is greater than a calibrated value. This fault will illuminate the CEL for the duration of the fault being active.
4. Code s 147/7 — occurs if error in actual EGR rate vs desired EGR rate (Actual – Desired) during EGR mode operation. This FMI signifies excessive EGR flow. This fault will lock boost mode operation and illuminate the CEL for the remainder of the ignition cycle if the actual is greater than the desired.
5. Code s 147/2 — occurs if error in actual boost vs desired boost during Power Boost mode operation is greater than it should be. This fault will illuminate the CEL for the duration of the fault being active.
6. Code s 147/12 — occurs if error in actual boost vs desired boost during Jake Boost mode operation is greater than it should be. This fault will illuminate the CEL for the duration of the fault being active.
7. Code s 147/14 — occurs if error in actual EGR rate vs desired EGR rate (Desired – Actual) during EGR mode operation. This FMI signifies low EGR flow. This fault will illuminate the CEL for the duration of the fault being active.

Section 39.3.1
Verify Repairs

Perform the following steps to verify repairs:‪

1. Reassemble the engine.
2. Start and run the engine.
3. Perform a road test.
4. Check for logged codes.
   1. If codes 146/152 or 147/153 are logged, refer to "10.16 Exhaust Gas Recirculation System (EGR-1) – Fault, Series 50 Engine" for Series 50 engines. For Series 60 engines, refer to "10.18 Exhaust Gas Recirculation System Basic Checks for Series 60 Engines" . Or, call Detroit Diesel Technical Service.
   2. If no codes are logged, repairs are complete.