Possible Causes
| Possible Causes |
|---|
| (F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND |
| (K34) EGR SIGNAL CIRCUIT SHORTED TO GROUND |
| (F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT |
| (K34) EGR SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT |
| (F856) 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE |
| (K34) EGR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE |
| EGR VALVE ASSEMBLY |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to *PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .