Powertrain Chart 3 - Powertrain Ground Check

Circuit G401 is ground location for fuel pump. Circuit G104 is cooling fan and A/C compressor clutch ground. Circuit G301 is ground for all powertrain electronics, including PCM.

Loose or poor ground connections may cause a variety of problems, including flickering telltales, PCM codes and several driveability problems. POWERTRAIN GROUND CHECK should be performed when referred to by other diagnostics or when erratic or intermittent problem is present.

These 3 vehicle grounds are essential for proper powertrain system operation. They are:

• Circuit G301, located on upper portion of right side kick panel.
• Circuit G104, located on right side of starter.
• Circuit G401, located on front side of left rear seat diagonal brace.

Fig 1: POWERTRAIN Chart 3 Schematic - Powertrain Ground Check

Courtesy of GENERAL MOTORS CORP.

Fig 2: POWERTRAIN Chart 3 - Powertrain Ground Check (G104)

Courtesy of GENERAL MOTORS CORP.

Fig 3: POWERTRAIN Chart 3 - Powertrain Ground Check (G301)

Courtesy of GENERAL MOTORS CORP.

Fig 4: POWERTRAIN Chart 3 - Powertrain Ground Check (G401)

Courtesy of GENERAL MOTORS CORP.