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  1. Pcpurvis

    P0332, Knock Sensor Low Voltage

    No voltage output from a knock sensor unless you induce a vibration (hit your block with a hammer-tap it). You will only see AC voltage proportional to the amplitude of the induce strike. Typically on the bench vice you will see from 20 - 110 mv on a meter best to view on an oscope if you have...
  2. Pcpurvis

    Several ABS codes

    So I replaced both front hub assemblies (245K miles) last weekend. On my first commute to work the ABS / Brakes warning lamps came on. Oddly enough on the test drives (weekend 80 miles) all was good. This was strange as it was throwing codes prior to the hub replacements almost instantly when...
  3. Pcpurvis

    Rear end oil change

    Good to know. So how can you tell which type you have if you have an automatic transmission? My TJ is a manual 6 speed and the wheels spin in opposite directions when rotating a wheel by hand (open slip).
  4. Pcpurvis

    Several ABS codes

    I have a set of wheel hubs arriving tomorrow they come with speed sensors. I bought a CReader Launch CPR123 unit last year thinking it would help with diagnosing the ABS issues but it can only read and reset DTCs that are ABS related. Honestly it is a piece of junk; has very little graphing and...
  5. Pcpurvis

    Several ABS codes

    I believe you are correct replace the hub assemblies would be the most sensible first thing to do; they are original. I inspected and cleaned the hub tone rings when I serviced the brake calipers; they were in good condition with no rust or signs of wearing. But the issue may be due to bearing...
  6. Pcpurvis

    Several ABS codes

    Well I should have known the Gremlin King wouldn’t die that easy; the ABS warning lamp and Brake lamp are back. Intermittent with no commonality with speed or turning; some times just sitting still in park without the brake pedal depressed. I did the bearing test and I believe both front...
  7. Pcpurvis

    Rear end oil change

    The note about the limited slip additive is on the back
  8. Pcpurvis

    Rear end oil change

  9. Pcpurvis

    P0332, Knock Sensor Low Voltage

    Update After running with the resistors for several days with no codes I can be certain that the PCM and harness wiring is good. So all points to a bad knock sensor. So to further isolate bank 1 I cut the dark blue wire on the manifold side of the knock sensor harness connector and wire nutted...
  10. Pcpurvis

    Several ABS codes

    Thanks for the diagrams; my 02 Yukon only has front wheel speed sensors. I replaced the brake pads and flushed the entire brake system with DOT4, cleaned the wheel sensors; I now have a firm brake peddle, great breaking power, and NO ABS / BRAKE codes! The ABS always worked even though it was...
  11. Pcpurvis

    Rear end oil change

    I replaced the rear differential gear oil last weekend using 75w90; it took right at 3qts. The old oil looked very good for the miles (at least 170k miles); the differential was like new with only a very small amount of metal filings on the magnet (like putty in fact). Got it cleaned out and put...
  12. Pcpurvis

    Several ABS codes

    Can anyone confirm that this is the same pin out used on 2002 Yukon? Also for the 2002 Yukon is the B1 vehicle speed signal coming from the transmission speed sensor or is it actually from the rear wheel speed sensor? Reason I ask is that my launch CRP123 scan tool shows 3 wheel speed sensors...
  13. Pcpurvis

    Rear end oil change

    Thanks for the information; I’ll change out the tranny fluid and filter once I have corrected the ABS phantom and replace the knock sensors and harness ( both are still throwing intermittent codes after my second round of “fixes”). I’m changing the rear differential fluid today and just Needed a...
  14. Pcpurvis

    Rear end oil change

    I have a 02 Yukon SLE 5.7L, 4 speed automatic transmission. Do I need to add limited slip additive to the gear oil? Also I want to verify the gear oil is SAE 75W90 Synthetic (GM spec 9986115) VIN: 1GKEC13Z42R299363 Thanks In advance
  15. Pcpurvis

    Brake line removal and install at abs module procedure ?

    I’m fighting the same fight with a PC0245 code; I was able to remove the ABS module and I resolded all the large solder connections. My scan tool cannot activate the ABS so to bleed it I went old school down a dirt road and did several power skids to activate it. To my surprise it did activate...
  16. Pcpurvis

    P0332, Knock Sensor Low Voltage

    Thanks @ Or VietVet will do.
  17. Pcpurvis

    P0332, Knock Sensor Low Voltage

    My 02 Yukon SLE has just joined the knock knock club (240K miles); after reading every post on every forum as well as viewing every video on YouTube regarding the random PO 0327 code I made my choice to isolate the sensors from the ECM to confirm the harness and ECM was throwing false codes due...

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