Quote:
Originally Posted by pdm
If its a Bendix system the ecu should be on top of the rear relay valve. There will be LED lights on the side to indicate where the problem is. The fault codes can be reset by holding a magnet next to the lights for 20- 30 seconds.
If its a Rockwell/Meritor there may be a blink code switch somehwere, near the diagnostic connector? Hold the switch for 1 sec & release & it will blink out a 2 digit code. Hold it for more than 3 sec to clear the codes. Light will blink fast 8 times to indicate codes were cleared, The light will stay on till the truck is driven more than about 4 mph .
maybe try googling bendix abs, meritor abs
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Bendix has been "off and on" with those indicator lights; the ec-16 used them, the ec-17 didn't for example. ...so, I wouldn't look too hard for them. If they ARE used on the ECU, they are; green to indicate power, and a series of 3 red lights to identify the fault.
However, in an '01 9400, my fading memory tells me that the ECU will be found inside the cab, behind the driver's side kick panel (to the left of the clutch pedal), and it's not even easy to locate once that panel is removed; BTDT. There will be a small, round twist-type ?black? connector (maybe 12-wire?) that passes out through the firewall just in front of the driver's feet... I would first remove that connector (from the outside) and inspect for green death.
There is not much point in resistance testing the sensors unless you know which one to check; I would use allan's "sensor connector swap" idea to narrow it down if the firewall connector checks ok.