• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 6 – 9Ford Historic (OBD I) Diagnostics64. View and write down DTCs.•Use UP or DOWN arrowkey.✓ ENG indicates that DTC is fromthe engine or powertrain controlmodule.✓ After viewing and noting theKOEO codes, use the DOWNarrow key to view continuousmemory codes.✓ Continuous memory codes(codes set previously undernormal driving conditions) areavailable after reading KOEOcodes. They are indicated asMemory Codes by the Scan Tool.5. Return to Diagnostic Codes Menu.•Press BACK.Read KOER Codes✓ The Read KOER Codes function activates the KOER self-testwhich retrieves KOER DTCs that are present when the engine isrunning.When the trouble condition is inactive, the KOER code isno longer sent through the data stream. This function alsoperforms a Computed Timing Check for EEC-IV vehiclesmanufactured from 1984 through 1991.✓ The DTCs are transmitted in two formats which transmit the sameinformation:• Slow Codes are regular service codes that allow the user to identifythe faults with an analog voltmeter or the check engine light. SlowCodes are transmitted within 3 minutes.• Fast Codes are transmitted within seconds and must be read witha diagnostic tool. MECS vehicles do not support Fast Codes.1 of 3ENGExcessive converterclutch sli ppage.KOEO6282 of 3ENGMAP sensor signalvoltage higher orlower then expected.MEMORY126
