Cause
- Control power fuse (F3A or F3B) is open.
| Components | Troubleshooting | Corrective actions |
|---|---|---|
| Check F3A, if the fuse is open: | Check PA, PB, CH coils for short to ground, if short is found: | Replace the defective coil. Replace the fuse. |
| Check F3B, if the fuse is open: | Check ESV coil resistance at TP7 to TP9, if short to ground, or if resistance is less than 4 ohms, coil is defective. Check CF, ES, EF, HR coils for short to ground, if short is found, coil is defective. | Replace the defective coil. Replace the fuse. |
| Check Voltage at QC1: | If voltage is present, it indicates a defective microprocessor. | Refer to Controller Service Section 6.23. |
