Troubleshooting Flash Code 48
Fuel Pressure code is logged as a result of a mechanical fault. Check for reasons for low fuel pressure. Refer to appropriate service manual, section 5.
This (Gas-fueled engine) code is logged as a result of a mechanical fault. Check for reasons for low air inlet pressure. Refer to appropriate service manual, section 6.
For all EGR related codes, always perform the basic checks in (EGR-1) 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" .
Then, perform the following steps to troubleshoot code 48:
Check for Other Codes
Perform the following steps to check for other codes:
- Turn ignition ON.
- Plug in DT.
- Read active codes.
- If codes 63 (s 060) and/or 31 (s 52) display, service those codes first.
- If codes 63 (s 060) and/or 31 (s 52) do not display, refer to "48.3.2 Vehicle Air Test" .
Vehicle Air Test
Perform the following steps to check the vehicle air test. The vehicle air test should have been performed during EGR–1 on a Series 50 engine; refer to "10.16 Exhaust Gas Recirculation System (EGR-1) – Fault, Series 50 Engine" . On a Series 60 engine, refer to "10.18 Exhaust Gas Recirculation System Basic Checks for Series 60 Engines" . If the test was not performed, refer to proper section and perform all steps.
- If the vehicle air system failed the test, resolve low vehicle air pressure.
- If the vehicle air system passed the test, replace the EGR valve and refer to "48.3.3 Verify Repairs" for verification of repairs.
- No additional DDEC troubleshooting is recommended for these six codes. Check all Basic Checks and then contact Technical Service for instructions, providing a snapshot and code logging details.
Perform these steps to verify repairs to the vehicle air system:
- Connect all connectors.
- Start engine.
- Perform road test.
- Has the fault returned?
- If the code is logged, review this section to find the error. If the fault returns after review, try a test ECM or contact Detroit Diesel Technical Services.
- If no codes are logged, troubleshooting is complete.
|DDEC III/IV Single ECM Troubleshooting Guide - 6SE497|
|Generated on 10-13-2008|