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Our 2009 Kenworth T800, the low air pressure buzzer does not sound when the pressure is below 60 psi. The red warning lights are on in each gauge( primary tank and secondary tank). It has a electron

Our 2009 Kenworth T800, the low air pressure buzzer does not sound when the pressure is below 60 psi. The red warning lights are on in each gauge( primary tank and secondary tank). It has a electronic speedo cluster. Is there anyway to test if it is the sensors for each tank or the cluster? Someone told me the module for the buzzer was in the cluster. Any help would be appreciated. Thank you.

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  • Cars & Trucks Master
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Most likley the buzzer itself is bad. I would start there and test it it off the vehicle.

Posted on Nov 26, 2014

Testimonial: "From what I am told the buzzer is in the dash cluster unit and is all one circuit board. It would be crazy to have to replace the whole speedo/tach cluster to have a buzzer."

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I brought my RX350 to the dealer for this problem before. They told me to inflate my tires to 36psi for winter time although the recommended pressure is 30 psi

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SOURCE: Emissions sensor fuel tank 2001 gmc jimmy

I don't think you have anything wrong, I just don't think you have completed the correct drive cycle yet. Some vehicles must be driven in a very specific way before all the monitors will set. Here is the drive cycle that Gm Recommends:

  1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 122°F (50°C) and within 11°F (6°C) of the ambient air temperature at startup.
    Do not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run.
  2. Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire, and - if closed loop is achieved- Fuel Trim.
  3. Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 55mph (88km/hr) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
  4. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
  5. Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 20 mph (32km/hr). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
  6. Accelerate. Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). This will perform the same diagnostics as in step 3.
  7. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
  8. Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

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SOURCE: how do you reset the low tire air pressure gauge

Since you have such a new vehicle you should have a owners manual. The instructions to reset are in the manual. If not you should get one from the dealership, probably for free. That manual will give you other reset procedures you are going to need in the future.

Posted on Oct 20, 2009

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SOURCE: 1996 oldsmobile aurora oil pressure

The Aurora is a low pressure oil system. The only solution available at this time is to increase the oil weight. I went o straight 30W to solve the idle alarm issue. Some use 20W oil and that works too.
With 20W you will be at 80 to 90psi cold then drop to 20-30psi hot.
I first replaced the oil pressure gauge and it was worse. I put the original back in and it was better. Then went to 30W and all is fine.
Running it that way for a few years now.

Posted on Apr 03, 2010

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If by red lined you mean it went over the 250 psi range??

Assumiing that the answer is yes. This is what I think.

The Hi and Low pressure switches prevent damage to the compressor if the pressure is out of range.

Before going any further, check A/C Relay and fuse.

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