1.6tDi, Inlet press sensor low volts, ESP and Start/Stop fault
Posted: Fri Jan 26, 2018 11:44 am
Odd intermittent problem with a Passat B7 1.6Tdi Bluemotion 2012.
Symptoms:
Traveling at a steady ~50 on a clear road.
Glowplug indicator started flashing and car went into limp mode.
Got to where we were going and restarted a few hours later: Car seemed fine.
Booked it in to be looked at. (Independent VW specialist)
He did an ODB scan and advised he saw “Low manifold pressure” (from memory) which suggested air leak in the intake system
He checked hoses, ducts and pipework and found no problem. Cleared the fault and a test drive didn’t throw it up again.
A few days later:
Waiting in queue at gas station. Space came clear and I rolled forward the last yard with clutch down, no brake needed and just canme to a stop at the pump.
Glowplug indicator started flashing, message on console display “ESP fault”, followed by “Start Stop fault” (From memory)
Fault cleared on restart.
A few days later:
Going round roundabout gently (full 180 degree turn at small roundabout)
Glowplug indicator started flashing, message on console display “ESP fault”, followed by “Start Stop fault” (From memory)and car went into limp mode
Fault cleared on restart
Booked it in to be looked at again.
Had “Low voltage on boost sensor” (from memory)
Changed sensor, test drive without incident.
Going home later that day
Just driving along <20mph, Glowplug indicator started flashing, message on console display “ESP fault”, followed by “Start Stop fault” (From memory)and car went into limp mode
Back to garage and code scan still gave “Low voltage on boost sensor” (from memory)
Diagnostics advice for “ESP fault” and “Start Stop fault” suggest checking the engine management computer (which could implicate whatever caused the boost sensor fault)
We now wonder whether there is damaged wiring somewhere between the EMC and the boost sensor. The guy proposes to run new wiring and isolate old cables.
Anyone have any ideas?
Many thanks
Symptoms:
Traveling at a steady ~50 on a clear road.
Glowplug indicator started flashing and car went into limp mode.
Got to where we were going and restarted a few hours later: Car seemed fine.
Booked it in to be looked at. (Independent VW specialist)
He did an ODB scan and advised he saw “Low manifold pressure” (from memory) which suggested air leak in the intake system
He checked hoses, ducts and pipework and found no problem. Cleared the fault and a test drive didn’t throw it up again.
A few days later:
Waiting in queue at gas station. Space came clear and I rolled forward the last yard with clutch down, no brake needed and just canme to a stop at the pump.
Glowplug indicator started flashing, message on console display “ESP fault”, followed by “Start Stop fault” (From memory)
Fault cleared on restart.
A few days later:
Going round roundabout gently (full 180 degree turn at small roundabout)
Glowplug indicator started flashing, message on console display “ESP fault”, followed by “Start Stop fault” (From memory)and car went into limp mode
Fault cleared on restart
Booked it in to be looked at again.
Had “Low voltage on boost sensor” (from memory)
Changed sensor, test drive without incident.
Going home later that day
Just driving along <20mph, Glowplug indicator started flashing, message on console display “ESP fault”, followed by “Start Stop fault” (From memory)and car went into limp mode
Back to garage and code scan still gave “Low voltage on boost sensor” (from memory)
Diagnostics advice for “ESP fault” and “Start Stop fault” suggest checking the engine management computer (which could implicate whatever caused the boost sensor fault)
We now wonder whether there is damaged wiring somewhere between the EMC and the boost sensor. The guy proposes to run new wiring and isolate old cables.
Anyone have any ideas?
Many thanks