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Old 08-20-2023, 07:59 AM   #1
Mini-Skoolie
 
Join Date: Feb 2020
Posts: 11
Year: 2004
Coachwork: Bluebird
Chassis: TC2000FE
Engine: Cummins 5.9L
Cummins ISB 5.9 engine de-rate issue

Hello - WE have a 2004 Bluebird TC2000 Cummins 5.9 ISB Front Engine -Allison 2000 automatic rig. Over the last 3 months I've been experiencing an intermittent engine fault that causes the engine to derate. I've taken the rig into 3 different shops and come out with a new camshaft sensor then a new crankshaft sensor but I still have this issue. No one seems to be able to get the exact cause. Yesterday when going up a 6% grade for a mile, the check engine turned on and we crawled up at 10mph - rather unnerving. I have a bluefire system and these are the fault codes usually displayed (pics):

1075 - Fuel Pump Speed/Position Sensor
1078 - Fuel Pump Speed/Position Sensor
190 - Engine Speed Data

197124 - Engine Unknown SPI
97592 - Engine Unknown FMI

When the mechanics pull the codes, they seem to just get the first two - corresponding to the Cummins codes of


368 Fuel Pump Can Not Reach Commanded Timing

369 Fuel Pump To Engine Synchronization Pulse Not Recognized

The fuel pump was replaced about a year ago and so far the mechanics don't believe this is the issue, but that are not sure.

Anyone ever run into this issue? Any advice? Its looking like I'll need to head to a Cummins dealer to see if they can diagnos/repair - but trying to avoid.
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indurain is offline   Reply With Quote
Old 08-20-2023, 10:19 AM   #2
Bus Nut
 
Join Date: Oct 2018
Location: Central Alabama
Posts: 591
Year: 1998
Coachwork: Blue Bird
Chassis: TC/2000
Engine: 5.9 Cummins 12-valve
Rated Cap: 1
Was the lift pump replaced as well? Cummins QuickServe Online has some good info on the codes after you register your engine serial number.
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Old 08-20-2023, 01:10 PM   #3
Mini-Skoolie
 
Join Date: Feb 2020
Posts: 11
Year: 2004
Coachwork: Bluebird
Chassis: TC2000FE
Engine: Cummins 5.9L
Quote:
Originally Posted by BamaBus View Post
Was the lift pump replaced as well? Cummins QuickServe Online has some good info on the codes after you register your engine serial number.
@BamaBus - lift pump was not replaced.

Mechanics have been using the Cummins QuickServe info in their problem diagnosis. Apparently fault codes 368 and 369 occurring simultaneously directs to the replacement of the camshaft sensor and then the crankshaft sensor.
indurain is offline   Reply With Quote
Old 08-20-2023, 01:24 PM   #4
Bus Nut
 
Join Date: Oct 2018
Location: Central Alabama
Posts: 591
Year: 1998
Coachwork: Blue Bird
Chassis: TC/2000
Engine: 5.9 Cummins 12-valve
Rated Cap: 1
According to QuickServe, reason for 368 "The fuel pump can not achieve the timing value being commanded by the engine control module (ECM) due to an internal pump problem."
It adds, "The fuel pump uses pressure generated by an internal vane-type transfer pump and its timing solenoid to vary the fuel pump's timing according to the specified ECM commands. Possible causes can be classified into four groups:

Static timing - offset key, gear train issues
Low-pressure fuel supply issues - restriction issues, low supply pressure
Fuel pump return plumbing issues - high return restriction, overflow valve issues
Noise in the engine position pulse signal."

For 369, "Fuel pump controller does not detect engine position pulse at pin 7 of the engine harness ECM connector."
It adds "The fuel pump controller monitors/processes 10- to 12-VDC square wsoave signals at pin 8 (engine harness pump end). The leading edge of this wave is the top dead center reference for the pump. The reference signal must occur within a defined window. If an engine pulse is not recognized within a window, the pump controller sets an error (bit 12). If a final error (bit 13) is set, Fault Code 369 is triggered after 10 seconds while the engine is operating. If Fault Code 368 occurs along with Fault Code 369, verify the engine static timing. Most occurrences of this fault are due to improper wiring by original equipment manufacturer (OEMs) or to grounding issues, loose/shorted wires, or electrical noise."
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Old 10-23-2023, 10:06 AM   #5
Mini-Skoolie
 
Join Date: Feb 2020
Posts: 11
Year: 2004
Coachwork: Bluebird
Chassis: TC2000FE
Engine: Cummins 5.9L
Solved- Engine De-rate Issue with Engine Wiring Harness Replacement

Turns out there were multiple nicks and short bare sections of wire on the engine wiring harness. Replaced the original harness and the check engine lights do not return and there is no engine-derating.
indurain is offline   Reply With Quote
Old 10-24-2023, 08:18 AM   #6
Bus Nut
 
Join Date: Oct 2018
Location: Central Alabama
Posts: 591
Year: 1998
Coachwork: Blue Bird
Chassis: TC/2000
Engine: 5.9 Cummins 12-valve
Rated Cap: 1
Thank you for taking the time to post the final outcome.
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