Possible Causes
| Possible Causes |
|---|
| (D509) LIN BUS CIRCUIT OPEN OR HIGH RESISTANCE |
| (Z921) GLOW PLUG CONTROL MODULE GROUND CIRCUIT OPEN OR HIGH RESISTANCE |
| GLOW PLUG CONTROL MODULE |
| ENGINE CONTROL MODULE (ECM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure