Diagnostic Procedure

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2003 Hummer H2, 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 GMC Sierra, and 2003 GMC Cab & Chassis Sierra. 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 VS. 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.