Talk Morgan Forums Thread Like Summary - GDI Gauges Intermittent Fault

Hi,

Just asking the collective if anyone has experienced this and for any advice.

Just back from a 16 day trip across Europe, but on about 5 occasions, the following all went to Zero.

Speedometer
Rev counter
Coolant Temp
Fuel Gauge

On most occasions they returned to normal almost immediately, but on one occasion did not come back for a few minutes. The engine was fine. On 2 occasions the fault occurred while on the Motorway and it didn't occur while driving through a Downpour.

I had a new Battery fitted before the trip.

I'm thinking the dials may have a common earth, that needs attention, or there's some electronics that may be on its way out.

All is OK at the moment.

Thanks in advance.
Mark

Tony, this is the topology published by MMC for the Roadster showing hookup between ECU, BCU, instrument cluster and diagnostic socket.



It shows high and medium speed CANBUS and confirms your mention of two terminator resistors across CAN high and low and on each speed, these to prevent reflected signals at termination causing data corruption when bounced back. Since the GDI +4 uses similar BCU, albeit with the VDO master gauge system for instruments and no medium speed CANBUS used for same, it seems reasonable to assume it has otherwise a similar hookup.

The 16 pin OBD2 diagnostics connector had pins 6 and 14 populated as early as 2007 so yes those models did use CANBUS Doug.