Dim Check Engine Light (CEL): 1993 E350 RV
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Tuned
Joined: Nov 2006
Posts: 292
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Dim Check Engine Light (CEL): 1993 E350 RV
Hi guys,
Need some advice. My 93 E350 Class C RV has a dim CEL (engine running). The CEL is bright during the startup test (key on, engine off), and is off when the ignition switch is off.
I've found some info online, here's where I'm at:
My ignition switch (cylinder) was bad (outer piece was loose). I found another forum saying to replace the switch for the dim CEL, so I hoped it was this easy. Replaced the switch yesterday, no change.
Next idea I found was a bad EEC relay. Swapped it with the fuel pump relay, no change.
I did find an old response to an online question suggesting that the cause may be worn insulation on a wire causing a weak grounding, causing the CEL bulb to come on weakly. We've had mice in the RV, so this is a good possibility (chewed wire).
Any advice beyond looking for a bad wire?
Any advice on the easiest way to locate a bad wire (using a meter, etc.)?
Being an RV, there's no shortage of wires, and very limited room to work.
Thanks.
Mike
Need some advice. My 93 E350 Class C RV has a dim CEL (engine running). The CEL is bright during the startup test (key on, engine off), and is off when the ignition switch is off.
I've found some info online, here's where I'm at:
My ignition switch (cylinder) was bad (outer piece was loose). I found another forum saying to replace the switch for the dim CEL, so I hoped it was this easy. Replaced the switch yesterday, no change.
Next idea I found was a bad EEC relay. Swapped it with the fuel pump relay, no change.
I did find an old response to an online question suggesting that the cause may be worn insulation on a wire causing a weak grounding, causing the CEL bulb to come on weakly. We've had mice in the RV, so this is a good possibility (chewed wire).
Any advice beyond looking for a bad wire?
Any advice on the easiest way to locate a bad wire (using a meter, etc.)?
Being an RV, there's no shortage of wires, and very limited room to work.
Thanks.
Mike
Moderator
Joined: Jan 2001
Posts: 56,992
Likes: 2,741
From: Virginia
I would check grounding. Check for a corroded small ground that comes off the large ground to the battery lug/terminal. I am not sure where it is on a van, but you should also have a ground going from the engine block somewhere (usually the bellhousing bolt area) to the sheetmetal.
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