Bulldoggin Posted January 26, 2017 Share Posted January 26, 2017 Hi there Macksters, I have an 08 Pinnacle MP8 with an EF Gen 3 autoshift and 682K on the clock. Bought it 6 months ago and I've had a recurring problem with moisture and recently water leaking into and on the EPDM. Unfortunately the Ignition relay was an unsealed variety and must have swallowed some water. Perhaps from energizing it every time I started it, it finally went nuclear and wouldn't start. About 10 fuses were burned on the legs but never popped. I believe the VECU and ABS ECU sustained some damage. I have 2 inactive codes with FMI 9, abnormal update rate, the ECU and TECU. The truck won't start because the VECU doesn't supply the 12 volts for the start enable relay and the TECU doesn't energize the start enable relay, and not allowing a reference for neutral. My question is, when I test for continuity through the J1939/CAN H & L, I have continuity to F11 (pos 12V) and several other circuits that it is connected to through both yellow and green wires. When I disconnect the circuit connectors from the VECU with the data lines still connected there is no continuity to F11, just once the circuit connectors are plugged in. There is continuity when the connector that has the data lines and other circuits is plugged into the ABS ECU. Is the continuity to F11 the interference between the ECU's that is disrupting communication ? Is the VECU and ABS the problem internally that is allowing continuity ? When I unplug the connectors and test continuity through the data line pins and other circuit pins in the ABS ECU there is none, unless the battery cable are connected. Just trying to isolate where the problem is. Any help would be greatly appreciated. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/48521-08-mack-pinnacle-cxu613-mp8-no-start-after-ignition-relay-meltdown/ Share on other sites More sharing options...
Mackpro Posted January 28, 2017 Share Posted January 28, 2017 There was a recall on the fuse panel on most models due to water getting into them, have you installed a new panel? What your vin and I can see what I can do Quote Link to comment https://www.bigmacktrucks.com/topic/48521-08-mack-pinnacle-cxu613-mp8-no-start-after-ignition-relay-meltdown/#findComment-360035 Share on other sites More sharing options...
Bulldoggin Posted January 30, 2017 Author Share Posted January 30, 2017 I took mine apart, cleaned it up and put new relays in. When I was broke down this last time it started raining and I found the leak and repaired it. I installed the waterproof relays too. The VIN is 1M1AW07Y98N003542 Quote Link to comment https://www.bigmacktrucks.com/topic/48521-08-mack-pinnacle-cxu613-mp8-no-start-after-ignition-relay-meltdown/#findComment-360251 Share on other sites More sharing options...
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