Description
1. 01 27-17
2. SPN 1077/FMI 14 – GHG14
Internal or External Leakage of the High Pressure Fuel System (Too High, Leak Down Test)
The Motor Control Module (MCM) monitors rail pressure during engine shut down and compares it to a stored learned value.
If the bleed-down rate has changed due to leakage and it is below the learned value, this code will set.
Check as follows:
1. Check for multiple codes. Are additional fault codes present with SPN 1077/FMI 14?
a. Yes; service the additional fault codes first.
b. No; only SPN 1077/FMI 14 is present. Go to step 2.
2. Is the Motor Control Module (MCM) at or above the software level and fuel map ZGS specified in the chart shown below based on horsepower rating?
a. Yes; Go to step 4.
b. No; Go to step 3.
3. Using DiagnosticLink, go to the fault code in the Fault Codes panel. Under section “Extended Data Record #6 DPF Data,” check ‘rpg_leak_div_int’. Is ‘rpg_leak_div_int’ greater than 2.25?
a. Yes; update MCM software and fuel map to level specified in step 2 and Go to step 4.
b. No; update MCM software and fuel map to level specified in step 2 and release vehicle.
4. Start and run the engine until fuel temperature is greater than 35°C (95°F) and coolant temperature is greater than 70°C (158°F).
5. Shut the engine down.
NOTICE: The high pressure fuel rail feed lines, vibration dampers, P-clips, mounting bracket and hardware are
one-time-use components and MUST be replaced any time they are removed. Refer to TS letter 16 TS-9Rev2
(http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/16TS9Rev2.pdf)16 TS-9Rev2 for the high pressure fuel line kit numbers.
6. Check for an external high pressure fuel system leak(s). Are any leaks present at the following components?
• High Pressure Fuel Pump
• High Pressure Fuel Rail Feed Lines
• High Pressure Fuel Rail
• High Pressure Fuel Injector Lines
• Fuel Rail Pressure Sensor
• Pressure Limiting Valve
a. Yes; repair leaks. Verify repairs.
b. No; Go to step 7.
7. Check the engine oil dipstick. Is there any fuel in the oil?
a. Yes; Refer to section “Fuel in Oil”.
b. No; Go to step 8.
8. Check for leakage from the Pressure Limiting Valve (PLV). Refer to section “Pressure Limiting Valve Flow Test –Two-Filter Fuel System “. Does the PLV flow test pass?
a. Yes; Go to step 9.
b. No; replace the PLV and verify repairs.
For Two-Filter systems, Refer to section “Removal of the Pressure Limiting Valve – Two-Filter System”.
NOTE: The ignition has to be off for five minutes between High Pressure Leak Detection routines.
NOTE: DiagnosticLink ® 8.05 or higher is necessary to complete this troubleshooting.
9. One cylinder at a time, remove the injector fuel transfer tube and cap the rail at each injector using J-48704. Run High Pressure Leak Detection. Repeat for each injector. Record results.
10. With any one injector capped off, does Leak Detection pass?
a. Yes; replace the injector that passes Leak Detection when capped. Refer to section “Removal of the Fuel
Injector – Two-Filter System” and then run the HP Leak Detection Test again to verify repair.
b. No; Go to step 11.
11. Install all six rail caps. Crank engine for 10 seconds and then monitor rail pressure bleed down. Does rail pressure bleed down under 100 bar in less than five minutes?
a. Yes; replace the high pressure fuel pump. Refer to section “Removal of the High Pressure Fuel Pump – Two-
Filter System”.
b. No; replace all six fuel injectors. Refer to section “Removal of the Fuel Injector – Two-Filter System” and then
run the HP Leak Detection Test again to verify repairs.
3. SPN 1077/FMI 14 – GHG17
Internal or External Leakage of the High Pressure Fuel System (Too High, Leak Down Test)
The Motor Control Module (MCM) monitors rail pressure during engine shut down and compares it to a stored learned value.
If the bleed-down rate has changed due to leakage and it is below the learned value, this code will set.
Check as follows:
1. Check for multiple codes. Are there any additional SPN 1077 codes present?
a. Yes; service the additional fault codes first.
b. No; Go to step 2.
2. Is the Motor Control Module (MCM) at or above software level 6.4.0.5 and fuel map ZGS 007?
a. Yes; Go to step 4.
b. No; Go to step 3.
3. Using DiagnosticLink ®, go to the fault code in the Fault Codes panel. Under section “Extended Data Record #6 DPF Data,” check ’rpg_leak_div_int’. Is ‘rpg_leak_div_int’ greater than 2.25?
a. Yes; update MCM software to latest software level and Go to step 4.
b. No; update MCM software to latest software level and release vehicle.
4. Start and run the engine until fuel temperature is greater than 35°C (95°F) and coolant temperature is greater than70°C (158°F).
5. Shut the engine down.
NOTICE: The high pressure fuel rail feed lines, vibration dampers, P-clips, mounting bracket and hardware are
one-time-use components and MUST be replaced any time they are removed. Refer to TS letter 16 TS-9Rev2
(http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/16TS9Rev2.pdf) for the high pressure fuel line kit numbers.
6. Check for an external high pressure fuel system leak(s). Are any leaks present at the following components?
• High Pressure Fuel Pump
• High Pressure Fuel Rail Feed Lines
• High Pressure Fuel Rail
• High Pressure Fuel Injector Lines
• Fuel Rail Pressure Sensor
• Pressure Limiting Valve
a. Yes; repair leaks. Verify repairs.
b. No; Go to step 7.
7. Check the engine oil dipstick. Is there any fuel in the oil?
a. Yes; Refer to section “Fuel in Oil”.
b. No; Go to step 8.
8. Check for leakage from the Pressure Limiting Valve (PLV). Refer to section “Pressure Limiting Valve Flow Test – Two-Filter Fuel System”. Does the PLV flow test pass?
a. Yes; Go to step 9.
b. No; replace the PLV and verify repairs. Refer to section “Removal of the Pressure Limiting Valve – Two-Filter
System”.
NOTE: The ignition has to be off for five minutes between High Pressure Leak Detection routines.
NOTE: DiagnosticLink ® 8.05 or higher is necessary to complete this troubleshooting.
9. One cylinder at a time, remove the injector fuel transfer tube and cap the rail at each injector using J-48704. Run High Pressure Leak Detection. Repeat for each injector. Record results.
10. With any one injector capped off, does Leak Detection pass?
a. Yes; replace that injector that passes Leak Detection when capped. Refer to section “Removal of the Fuel
Injector – Two-Filter System” and then run the HP Leak Detection Test again to verify repair.
b. No; Go to step 11.
11. Install all six rail caps. Crank engine for 10 seconds and then monitor rail pressure bleed down. Does rail pressure bleed down under 100 bar in less than five minutes?
a. Yes; replace the high pressure fuel pump. Refer to section “Removal of the High Pressure Fuel Pump – Two-
Filter System”.
b. No; replace all six injectors. Refer to section “Removal of the Fuel Injector – Two-Filter System” and then run
the HP Leak Detection Test again to verify repair.
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