reklund
Full Access Member
On the way home from Salt Lake City a week ago, my speedometer began behaving erratically. At random times, the needle will drop roughly 10% of whatever speed the vehicle is moving, and then bounce back to the normal speed. So far to diagnose I have:
Observed the waveform of the rear axle speed sensor using a picoscope and it checks ok.
Tried a known good rear axle speed sensor (new from Ford) with no change.
Visually inspected the tone ring on the rear differential ring gear through the sensor mounting hole, and it appears fine with no damaged, bent, or funny looking teeth.
Verified circuit integrity from the rear axle speed sensor connectors all the way up to the cluster. All check ok.
I'm thinking it's a malfunction in the speedo head unit itself, and in my googling to see what's up, I came across these guys: www.clusterfix.net
It appears my condition is a somewhat common concern, and it usually manifests itself on automatic trans vehicles sooner as it causes all sorts of issues with the E40D shifting.
Anyone here have any experience with these guys, or have you successfully repaired one of these yourself?
Thanks,
Ryan
Observed the waveform of the rear axle speed sensor using a picoscope and it checks ok.
Tried a known good rear axle speed sensor (new from Ford) with no change.
Visually inspected the tone ring on the rear differential ring gear through the sensor mounting hole, and it appears fine with no damaged, bent, or funny looking teeth.
Verified circuit integrity from the rear axle speed sensor connectors all the way up to the cluster. All check ok.
I'm thinking it's a malfunction in the speedo head unit itself, and in my googling to see what's up, I came across these guys: www.clusterfix.net
It appears my condition is a somewhat common concern, and it usually manifests itself on automatic trans vehicles sooner as it causes all sorts of issues with the E40D shifting.
Anyone here have any experience with these guys, or have you successfully repaired one of these yourself?
Thanks,
Ryan