Question about 2003 Suzuki XL-7

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At low speed rpms are up and down like its trying to shift gears, high speeds it doesn't seem to find overdrive stays at high rpm. Automatic trans fluid is good. "Service engine soon" light seems randomly off and on.

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  • Suzuki Master
  • 17,970 Answers

I'll bet its the TCC solenoid (Torque Converter Clutch Solenoid). Also, I suggest check the VSS (Vehicle Speed Sensor), its fitted to the rear of the speedo unit.

If you have the Service Engine Soon turn on, its possible that you have any fault code too, try to scan the PCM to knowed exactlt what DTC code there. With this code number we can send additional info.

Test run at 3100 rpm on 55 mph, maybe you could pull the TCC relay out and see what the RPMs are at 55 mph, then you'll know for sure what you get with no TCC function.

Tell us news.



Posted on Aug 03, 2010

  • cjmotoman Aug 04, 2010

    Hey, Thanks for the help. The "service engine soon" light went out and the car started to perform normally. I had the code read and the only code that came up was the TPS. Also, when checking the TPS it seemed to be working properly except it would only read 77-79% at WOT. I had the service light reset and I guess I'll see what happens. Any thoughts?

  • ZJ Limited
    ZJ Limited Aug 04, 2010


    I'm assuming that you are talking about any code P0121 may mean that one or more of the following has happened:


    • TPS has intermittent open or short internally

    • Harness is rubbing and causing an open or short in the wiring

    • Bad connection at the TPS

    • Bad PCM (less likely)

    • Water or corrosion in connector or sensor

    So, for this fault check this alternative and possible solutions:1. If you have access to a scan tool, see what the idle and WOT (wide open
    throttle) readings are for the TPS. Check if they're close to the specifications
    mentioned above. If not, then replace the TPS and re-check.

    2. Check for an intermittent open or short in the TPS signal. To do that, you
    can't use a scan tool. You'll need an oscilliscope. The reason is because scan
    tools take samplings of many different readings over just one or two data lines
    and can miss an intermittent drop out. Hook up your oscilliscope and watch the
    signal. It should sweep up and down smoothly with no drop outs or spikes.

    3. If no problems were noticed, perform a wiggle test. Do this by wiggling
    the connector and harness while watching the pattern. Does it drop out? If so,
    replace TPS and re-check.

    4. If you have no TPS signal, check for 5 Volt reference at the connector.
    If it's present, check the ground circuit for open or shorts.

    5. Make sure the signal circuit isn't 12V. It should never have battery voltage.
    If it does, trace circuit for short to voltage and repair.

    6. Look for any water in the connector and replace TPS as necessary.


    Hope helps, good luck.

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