Trouble Shooting Charts

WARNING: This page does not describe the selected car, but rather 151 other vehicles, including the 1992 GMC Yukon, 1992 GMC Vandura Special, 1992 GMC Vandura, 1992 GMC Suburban, and 1992 GMC Sonoma. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Diagnostic Circuit Check (All Models)

G90J06148

Courtesy of GENERAL MOTORS CORP.

Fig 2: Brake Light On Part 1 (All Models)

G90B06149

Courtesy of GENERAL MOTORS CORP.

Fig 3: Brake Light On Part 2 (All Models)

G90D06150

Courtesy of GENERAL MOTORS CORP.

Fig 4: Brake Light On Part 3 (All Models)

G90F06151

Courtesy of GENERAL MOTORS CORP.

Fig 5: Brake Light Off (All Models)

G90H06152

Courtesy of GENERAL MOTORS CORP.

Fig 6: Brake Light Flashing (All Models)

G90J06153

Courtesy of GENERAL MOTORS CORP.

Fig 7: Codes 1, 11 & 12 ECU Malfunction (All Models)

G90B06154

Courtesy of GENERAL MOTORS CORP.

Fig 8: Code 2 Open Isolation Valve or Malf ECU (All Models)

G90E06155

Courtesy of GENERAL MOTORS CORP.

Fig 9: Code 3 Open Dump Valve or Malfunctioning ECU (All Models)

G90G06156

Courtesy of GENERAL MOTORS CORP.

Fig 10: Code 4 Grounded Anti-Lock Valve Switch (All Models)

G90I06157

Courtesy of GENERAL MOTORS CORP.

Fig 11: Code 5 Excessive Actuations of the Dump Valve During ABS Stop (Astro & Safari)

G90A06158

Courtesy of GENERAL MOTORS CORP.

Fig 12: Code 5 Schematics, Excess Actuations of the Dump Valve During ABS Stop (C & K Series)

G50D00250

Courtesy of GENERAL MOTORS CORP.

Fig 13: Code 5 Excessive Actuations of the Dump Valve During ABS Stop (C, K, S & T Series)

G90C06159

Courtesy of GENERAL MOTORS CORP.

Fig 14: Code 5 Excessive Actuations of the Dump Valve During ABS Stop (G, R & V Series)

G90E06160

Courtesy of GENERAL MOTORS CORP.

Fig 15: Code 6 Schematic, Erratic Speed Signal (C & K Series)

G50E00251

Courtesy of GENERAL MOTORS CORP.

Fig 16: Code 6 Erratic Speed Signal (C & K Series)

G90G06161

Courtesy of GENERAL MOTORS CORP.

Fig 17: Code 6 Erratic Speed Signal (All Others)

G90H06147

Courtesy of GENERAL MOTORS CORP.

Fig 18: Code 7 Shorted Isolation Valve or Faulty ECU (All Models)

G90A06318

Courtesy of GENERAL MOTORS CORP.

Fig 19: Code 8 Shorted Dump Valve or Faulty ECU (All Models)

G90C06319

Courtesy of GENERAL MOTORS CORP.

Fig 20: Code 9 Schematic, Open Circuit to Speed Sensor (C & K Series)

G50F00252

Courtesy of GENERAL MOTORS CORP.

Fig 21: Code 9 Open Circuit to Speed Sensor (All Models)

G90E06320

Courtesy of GENERAL MOTORS CORP.

Fig 22: Code 10 Brake Light Switch Circuit (C & K Series)

G50G00253

Courtesy of GENERAL MOTORS CORP.

Fig 23: Code 10 Brake Light Switch Circuit (C & K Series)

G90G06321

Courtesy of GENERAL MOTORS CORP.

Fig 24: Code 10 Brake Light Switch Circuit (Astro/Safari, S/T Series)

G90I06322

Courtesy of GENERAL MOTORS CORP.

Fig 25: Code 10 Brake Light Switch Circuit (G/R/V Series)

G90A06323

Courtesy of GENERAL MOTORS CORP.

Fig 26: Codes 13, 14 & 15 ECU Malfunction (All Models)

G90C06324

Courtesy of GENERAL MOTORS CORP.