System Diagnosis
The EDS can be tested by a built-in test program to EDS control unit. Fault signals can be found by connecting an On-Off Ratio Tester (909-589-00-21-00) into EDS system test connector. The number of times needle oscillates on tester shows which electric component is faulty or which components of EGR circuit are defective. See EDS SYSTEM DIAGNOSIS table.
EDS SYSTEM DIAGNOSIS
| Number of Needle Oscillations | Component/Circuit Not Functioning | |||
|---|---|---|---|---|
| 1 | RPM Sensor | |||
| 2 | Fuel Rack Sensor | |||
| 3 | Air Flow Sensor | |||
| 4 | Altitude Correction Capsule | |||
| 5 (1) EGR Circuit | ||||
| A) | EGR Valve | |||
| B) | Vacuum Transducer | |||
| C) | Airflow Sensor | |||
| 8 | Coolant Temperature Sensor | |||
| 9 | Air Temperature Sensor | |||
| 10 | Reference Resistor | |||
| 11 | Trimming Plug | |||
|
||||