Diagnostic Procedure

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Suburban, and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: DTC P0101: Mass Air Flow Sensor Performance (Steps 1-8)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P0101: Mass Air Flow Sensor Performance (Steps 9-15)

Courtesy of GENERAL MOTORS CORP.

ALTITUDE VERSUS BAROMETRIC PRESSURE

Altitude Feet (m) ⁽¹⁾

Barometric Pressure kPa

-1000 (-305)

101-105

Sea Level

96-104

1000 (305)

94-102

2000 (610)

90-98

3000 (914)

87-95

4000 (1219)

83-91

5000 (1524)

80-88

6000 (1829)

77-85

7000 (2134)

74-82

8000 (2438)

71-79

9000 (2743)

69-77

10,000 (3048)

66-74

11,000 (3353)

64-72

12,000 (3658)

61-69

13,000 (3962)

58-66

14,000 (4267)

56-64

⁽¹⁾	Determine your altitude by contacting a local weather station or by using another reference source.