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Brad Barker
Administrator
USA
874 Posts |
 Posted - 04/21/2016 : 10:28:21 AM
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I have an 09 Thomas Bus with MBE900 Mercedes. Engine starts and within 5 seconds goes to high idle. High idle switch off. ABS fault lamp and Trans Check lamps illuminated. Connected DDDL 7 which reads no communication with engine ecm. Connected to Allison Doc which reads no communication and ABS the same. Also have no instrument panel rpm, oil psi, coolant temp. ICU performs sweep test on key on just fine. Disconnected batteries and checked J1939 terminating resistors. Reads 62 ohms. Pulled ECM connectors from ECM. Engine oil ran out leaving a 6" puddle.
Replaced the dual power breaker assembly inside the frame rail. Replaced corroded battery power and ground cable ends and clean power fuse connections, fuses, so forth from battery to engine. Checked power and grounds front and rear.
Any ideas? |
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second.flood
Top Member
USA
640 Posts |
Posted - 04/22/2016 : 08:56:08 AM
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Why is this a sticky?
I don't have any Mercedes, but why oil from the ECM? |
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second.flood
Top Member
USA
640 Posts |
Posted - 04/23/2016 : 09:43:25 AM
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Why oil from the ECM? Is there a sensor integral to the ECM? Oil leak trailing a wire harness?
Is high idle possibly a fail safe or limp in feature caused by an ECM or wiring failure?
Check wiring harness near starter for shorted wiring.
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baptistbusman1
Senior Member
USA
175 Posts |
Posted - 04/24/2016 : 11:58:26 AM
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Every one of our 09 MBE900's leak oil out the ECM when unplugged. These engines are the biggest pieces of junk I have ever worked on. EGR's constantly clogged shut, the intakes clogged, oil blowing out of the turbos, DPF's clogged, turbo actuators messed up......
The EPA should have to pay to keep these things running. |
I was formally Baptistbusman. However, I lost my password, and had not updated my email address.
Here is a link to my old posts. http://www.schoolbusfleet.com/forum/search.asp?mode=DoIt&MEMBER_ID=1846 |
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07 Mercedes MBE 900
