Section 51.2
Troubleshooting Flash Code 48, PID 94, 412, 411, 351, 404/FMI 1
This condition is normally associated with a restriction in the fuel supply system (currently not used):
- Plugged fuel filter
- Low fuel supply
Note: Not all engines use a fuel pressure sensor.
For gas engines, code 48 indicates that the air inlet pressure has dropped below a calibration limit.
Flash Code 48 is also used to identify the EGR Delta-Pressure, or EGR temperature is below programmed limits. This condition is typically due to:
- EGR valve not opening completely
- EGR valve not opening at all – leaking CAC.
- Leaking EGR piping/hoses.
Flash Code 48 also indicates the exhaust gas temperature fell below calibrated limits, or EGR Delta-Pressure fell below calibrated limits. Possible causes include:
- EGR valve not opening
- EGR valve not opening fully
- Leaking CAC
Flash Code 48 also indicates the TCI (Turbo Compressor Inlet) or TCO (Turbo Compressor Outlet) temperature fell below the calibrated limits. Possible causes include:
- Leaking CAC
- Leaking inlet piping
- EGR valve not opening properly
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.
For all EGR related codes, always perform Exhaust Gas Recirculation System Basic Checks . Refer to "20.18 Exhaust Gas Recirculation System Basic Checks for Series 60 Engines" .
Then, perform the following steps to troubleshoot code 48:
Section 51.2.1
Check for Other Codes
Perform the following steps to check for other codes:
- Turn ignition ON.
- Plug in diagnostic tool.
- Read active codes.
- If code 39 and others display, service the other codes first.
- If code 39 did not display, refer to "51.2.2 Vehicle Air Test" .
Section 51.2.2
Vehicle Air Test
The vehicle air test should have been performed during Exhaust Gas Recirculation System Basic Checks . Refer to "20.18 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 "51.2.2.1 Verify Repairs" for verification of repairs.
- No additional DDEC troubleshooting is recommended for these codes. Do all the Basic Checks and then contact Detroit Diesel Customer Service Center (313–592–5800) for instructions, providing a snapshot and code logging details.
Section 51.2.2.1
Verify Repairs
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/ECU or contact the Detroit Diesel Customer Service Center (313–592–5800).
- If no codes are logged, troubleshooting is complete.
| Series 60 DDEC V Troubleshooting Guide - 6SE570 |
| Generated on 10-13-2008 |
I’m getting codes and not sure what they are
FMI 31
SPN 636
FMI 1
Spn 111
have a 2007 Western star 4900 FA with 14 liter 60 series Detroit engine
I’ve had so much done to it by certified Detroit engine tech’s to discover and correct a engine issue which to date has not been found nor corrected.
Symptoms:
Shifting through bottom gears is of course quick and no Symptoms appear. Once in higher gears and prolonged throttle applications are present, that’s when the problem becomes apparent.
Feels like injector failure or air in fuel. Coolant temp rises, power diminishes and rough running / popping etc is there.
Back off the throttle to round a cloverleaf ( access to other highway or similar) and reapply the throttle and Symptoms are ( temporarily) gone till once again I’m on the throttle fully for a prolonged period of time.
2. Idle truck for upwards of 60 minutes and again, all Symptoms are gone once I start working the engine, but again the popping/ power reduction etc returns one I’m on the throttle for a while ( 25 seconds +)
After 8-10 hour’s working the truck, Symptoms taper down and often leave completely.
-after truck sits, not used for a couple day’s or more, engine runs pretty decent for the 1st hour or so.
-power is hugely effected along with the popping etc.
Detroit support got involved. They had new ( not reman) VPOD installed, new engine wiring harness, new boost sensor, new Syncro sensor, new turbo .
( 4 turbos were tried, 3 VPOD’s also)
No codes present whatsoever.
The EGR was also replaced ( this I paid for, the prior I did not, Detroit picked up the bill )
Engine was fully rebuilt by Detroit tech’s ( Wajax, Stoney Creek Ont)
who have also done all previously mentioned work.
27 visits to date ( to Wajax), none of which have corrected my problem.
The ” popping power reduction stumble etc” can be quite bad, bad enough my power divider failed, the eyes in my driveshaft wowed out
( became oval) , U-joints failed, Tranny failed, the bell housing seal/ gasket began leaking and the list continues.
Again, no issue’s until engine is under load with prolonged throttle applications. Mornings can be horrific, even though engine is 2x 120 minute
“Wabasto ” pre-heated in colder season.
Please help. My cell: 905 746 5505
Thank you.
REPLY