My Grand Caravan would randomly just stop running every half hour or
so, and it showed a 54 code. I replaced the camshaft sensor and after
briefly showing an 11 code, it has reverted back to the 54 code with
the new sensor but ran more badly (just seconds before dying). The
sensor is clearly continuing to provide its signal as the engine first
runs, then stumbles, and then dies.
Testing method: I used an old fashioned moving-needle VOM to observe
the sensor output. These antiques show the product of the voltage times
the duty cycle, whereas digital meters periodically sample their input,
and hence show random variations. Doing this, I got a pretty steady ~1
volt AVERAGE output from the sensor regardless of how badly the engine
was running. A DVM showed 0.05 volt output when the engine was stopped.
Unless I am missing something (certainly wouldn't be the first time),
this MUST be either the computer (e.g. the camshaft sensor input
threshold has drifted to some absurd voltage) or intermittent wiring
between the sensor and the computer. I tend to dismiss wiring because
this has shown two DIFFERENT intermittent modes of operation that
changed suddenly when the sensor was changed, which seems (to me) to be
pretty far fetched as a wiring problem. Are there ANY other reasonable
Are these computers repairiable? I would guess that whatever chip the
camshaft sensor goes to has probably been fried, so if it can be
identified and changed, the computer could be repaired.
I looked on eBay and other places and did NOT find a replacement
computer. Is there a source of them somewhere?
Thanks in advance for any help you can provide.