Chart D, Loss Of Communications (Non-CRT Equipped TORONADO & TROFEO)

Fig 1: Chart D - Wiring Schematic (Non-CRT Toronado & Trofeo)

Courtesy of GENERAL MOTORS CORP.

NOTE: Test numbers refer to numbers on diagnostic chart.

1. Zero volts indicate an open or grounded data line.
2. This step checks for short to ground on data line
3. Since ECCP displays were lost, an open must exist between BCM and ECCP. This step determines which side of PCM open is on.

Fig 2: Chart D - Troubleshooting Diagram (Non-CRT Toronado & Trofeo)

Courtesy of GENERAL MOTORS CORP.