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    Test TOPS switch?

    I have a 2007 RXT that continues to give me a fault code of 1502, TOPS fault. How can I test the TOPS switch to see if it is functioning properly?


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    Quote Originally Posted by dustintinsley View Post
    I have a 2007 RXT that continues to give me a fault code of 1502, TOPS fault. How can I test the TOPS switch to see if it is functioning properly?
    The TOPS is both a mechanical and electrical device. Mechanically, it only needs to prevent oil (air) from flowing out of valve area when flipped. The TOPS uses a shared power source (+5V) with the TAS and MAPS. A higher drain on one of the others could trip this code. Harness could also do this.

    Check for an open circuit (bad) on A-C4, A-G1 and A-F4. Also test other sensors I mentioned are in spec.

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