Notes On Flow Chart

Circled numbers in flow chart correspond to the following numbers:

1. To diagnose this condition, clear codes. Enter output cycling. Manipulate affected wiring. Tap the sensor. Recheck for codes. See NOTES ON INTERMITTENTS under TESTING & DIAGNOSIS.
2. The code may set because Code S077 is set. If Code S077 is set, first diagnose and repair fault causing Code S077.
3. Negative values may roll over from -100 to +117, but should be considered as LESS THAN -90.
4. If MORE THAN 90 is displayed, the value may be as high as 115.

Fig 1: CODE S073 Schematic

Courtesy of GENERAL MOTORS CORP.

Fig 2: CODE S073 Flow Chart

Courtesy of GENERAL MOTORS CORP.