GM Service Manual Online
For 1990-2009 cars only

Low Air Pressure Switch Diagnosis for Isuzu Isuzu MD Steel Tilt (F Model) 2000

  1. Apply the parking brake.
  2. Drain all of the reservoirs. Refer to Draining Reservoirs
  3. Start the engine and run the engine at a fast idle.
  4. Verify that the low pressure tone alarm is on.
  5. •  If the tone alarm is not on when first charging the system, test the brake warning system.
    • For diagnosis of the brake warning system, refer to Brake Warning System Check.
  6. The low pressure tone alarm should turn off when the dual air pressure gauge indicates 470-510 kPa (68-74 psi).
  7. •  If the tone alarm does not turn off, test the brake warning system.
    •  For diagnosis of the brake warning system, refer to Brake Warning System Check.