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Old January 30th, 2005, 05:01 PM
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Michael Howell
Join Date: Sep 2003
Location: Seattle
Posts: 69
Fault Code Help

Check engine light came on today, computer readout said code 48. Here's what the FAQ says for #48:

Code 48 - Stepper motor
Check base idle speed- see setting procedure.
Refer to tests 15 and 16 of continuity test procedure.
Check road speed sensor- refer to test 25 of continuity test procedure.

Can anyone explain this in laymens terms? How big of deal is this? Thanks guys.

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Old January 30th, 2005, 05:43 PM
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Hans Haase
The D-90.com Lab Rat
Join Date: Oct 2003
Location: Long Island, NY
Posts: 2,385
The stepper motor is easy to access. It's on the right-rear of the intake plenum, and has 4 wires coming out in a square pattern. It regulates extra air going into the intake to adjust idle speed. Replacement is easy, it just unscrews and undo a single wiring connector. I believe new ones are available from NAPA and a few other parts stores, it's not a Rover dealership only thing.

Checking the base idle is easy, when the engine is warm just look at your tach. If your engine idles higher when it's cold, and drops down to normal when it's warm, then the stepper motor is most likely working fine. Just reset the code and see if it comes back.

The continuity testing basically means to check that the wires and connections to the computer are ok.

Part of the system is the vehicle speed sensor, attached to the transfer case. Again, it just reccomends testing the wires for continuity. Haven't done anything with the VSS yet, so can't make many comments on it.

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