Trouble Shooting: Notes
If no faults were found during testing of individual components, fault may be in ECU control circuit. Inspect each input signal to ECU. If no faults are found in input signals, replace ECU.
CONTROL UNIT INPUT CHECKS
| Circuit | Go To Check No. | ||
|---|---|---|---|
| Frequency Solenoids A & B | |||
| Manual | 1, 4, 6, 7, 8, 10, 11, 12, 13 | ||
| Automatic | 1, 4, 5, 7, 8, 10, 11, 12, 13 | ||
| Frequency Solenoid C | 1, 2, 4, 5, 10, 11, 14 | ||
| Feedback Control Solenoid | |||
| 49-State | |||
| Manual | 1, 4, 6, 8, 11 | ||
| Automatic | 1, 4, 5, 8, 9, 11 | ||
| California | |||
| Manual | 1, 4, 6, 7, 8, 11 | ||
| Automatic | 1, 4, 5, 7, 8, 11 | ||
| A/T Idle Boost Solenoid | 1, 4, 5, 7, 10, 11, 14 | ||
| A/C Idle Boost Solenoid | 1, 4, 7, 10, 11, 14 | ||
| Air Suction Solenoid | |||
| 49-State | |||
| Manual | 1, 4, 7, 8, 10, 11, 12 | ||
| Automatic | 1, 4, 7, 9, 10, 11, 12 | ||
| California | 1, 4, 7, 8, 10, 11, 12 | ||
| Anti-Afterburn Solenoid | |||
| Manual | 1, 10, 11 | ||
| Automatic | 1, 5, 11 | ||
| Cranking Leak Solenoid | 1, 3, 4, 10, 11, 12 | ||
| Primary Slow Mixture | |||
| Cut-Off Solenoid | |||
| Manual | 1, 4, 6, 7, 8, 10, 11 | ||
| Automatic | 1, 4, 5, 7, 8, 10, 11 | ||
| EFE Heater | 1, 11 | ||