Without Scan Tool (Quest)
- If use of an OBD-II type scan tool is not available, DTCs can be retrieved by changing PCM output from Mode 1 to Mode 2. Mode 1 is the normal malfunction warning mode. Mode 2 displays self-diagnostic results.
- To switch PCM output from Mode 1 to Mode 2, locate the self-test harness connector. See Fig 3. Turn ignition on. Disconnect self-test harness connector and jump terminals No. 3 and 6 together. Disconnect jumper wire after being connected for at least 2 seconds. Reconnect self-test connector. MIL should now be in Mode 2. When in Mode 2 with engine off, MIL should begin flashing codes.
- The 4-digit DTCs (flash codes) are read as two 2-digit numbers. The first 2-digit number is indicated by a series of long flashes followed by a series of short flashes. E.g. one long flash followed by 2 short flashes indicates DTC 0102. See Fig 2. The DTCs retrieved by MIL are not numerically the same as DTCs retrieved from a scan tool.
- Write down DTCs and repair in order of priority. See DTC PRIORITY IDENTIFICATION table. To determine which circuit test to use, see appropriate DTC IDENTIFICATION table under SUMMARY . After retrieving DTCs or performing a repair, clear DTCs from PCM memory. See CLEARING CODES . If no DTCs or DTC P0000/MIL 0505 (pass code) were retrieved and fault still exists, proceed to TESTS W/O CODES
article for diagnosis by symptom.
Courtesy of FORD MOTOR CO.
Courtesy of FORD MOTOR CO.
Courtesy of FORD MOTOR CO.