Reference Value Symptom Chart
The Reference Value Symptom Chart is used to provide guidance in selecting the appropriate parameter identification (PID) or measured signal related to the fault area. Select a symptom from the symptom chart along with the category number and go to the PID/MEASURED SIGNAL CHART . For multiple symptoms, select the symptom that is the most evident.
SYMPTOM CHART
| Symptom Occurs During | Symptom | Category Number |
|---|---|---|
| Startup | No start/Normal crank | 1 |
| Hard start/Long crank | 2 | |
| Stall after start | 3 | |
| Diesels/Runs on | 4 | |
| Idle | MIL | 5 |
| Stalls/Quits | 6 | |
| Slow | 7 | |
| Slow return | 8 | |
| Rolling | 9 | |
| Fast | 10 | |
| Rough | 11 | |
| Misses | 12 | |
| Backfires | 13 | |
| Acceleration | Stalls/Quits | 6 |
| Misses | 12 | |
| Bucks/Jerks | 14 | |
| Backfires | 13 | |
| Hesitation | 15 | |
| Lack/Loss of power | 16 | |
| Surge | 17 | |
| Spark knock | 18 | |
| Cooling system temperature | 19 | |
| Poor fuel economy | 20 | |
| Emissions compliance | 21 | |
| Cruise | Stalls/Quits | 6 |
| Misses | 12 | |
| Bucks/Jerks | 14 | |
| Backfires | 13 | |
| Lack/Loss of power | 16 | |
| Surge | 17 | |
| Spark knock | 18 | |
| Cooling system temperature | 19 | |
| Poor fuel economy | 20 | |
| Emissions compliance | 21 | |
| Deceleration | Stalls/Quits | 6 |
| Backfires | 13 | |
| Transmission Operation: (Automatic) | Shift/engagement concerns | 22 23 |
| No overdrive | ||