[fakawe]

My "check engine light" on my 98 RR 4.6 is intermittenty flashing on the instrument panel and logged the fault as "p1607,MIL circuit open or short circuit".I searched this forum for any similar experience but no results. Thanks to the forumer who posted the DTC's list as I see the electrical gremlin originates from the engine ecu.I checked my rave cd (another thanks to the forumers who's posts enabled me to successfully download this) and the description explains only this :"engine control module (Z132) is interfaced to the instrument cluster (Z142) via the BeCM (Z238)"
I suspect there is a loose connection / shorting so my assumption is to trace this electrical gremlim starting from the engine ecu with the help of the rave electrical diagrams.I just hope this is not a symptom of a failing engine ecu. ray:
Any thoughts?
Are my assumptions on the right track?

thanks

 

[Rich998a]

Possibly an ECU problem, but you can check around the multiplugs. Opening the ECU is also an option, just to visually check if there is anything strange going on.

Which version of EMS do you have? GEMS?

 

[Rich998a]

Just another thought if it is GEMS.

As you know, the MIL illuminates as part of the initial start up of the engine. It's a self check thing like the ABS/TC etc you see illuminated on start up. If the bulb itself isn't working properly (or intermittently), the MIL will throw this fault. Perhaps it could be the instrument cluster ground triggering the DTC?

 

[fakawe]

yes , it's a GEMS ems.The auto electricians are busy today to check the multiplugs and any suspect wiring that may have "chaffed" and is causing a short circuit.If all this is ok we will check the ecu itself.
I will forward them your comment to check the instrument cluster as well.
I will report back on their findings.
Thanks.

 

[fakawe]

As promised here is a report back. While tracing for this fault a "chaffed wire" at the seat was found and repaired.Tested the vehicle for a couple of days and the 'CHECK ENGINE LIGHT" does not illuminate anymore.Seems this was the fault. :thumb: