Diagnostic Unit "A" Led Does Not Flash
- Disconnect diagnostic unit "A". Turn ignition on. Check for voltage at diagnostic connector terminal No. 4. If voltage is not present, check fuse and wiring. If voltage is present, turn ignition off.
- Connect an ohmmeter between diagnostic connector socket No. 8 and ground. Ohmmeter should indicate approximately zero ohms. If reading is not approximately zero ohms, check wiring. If wiring is okay, replace diagnostic unit "A".