Ford Corsar Repair Manual page 186

E.C.C.S DESCRIPTION
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Control System Modes
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Diagnostic Mode
The diagnostic mode is activated by turning the ignition 'OFF", wait-
ing 15 seconds for the E.C.M. t o power down, inserting service tool
ESD-28079 or similar (diagnostic bridge) then turning the ignition
"ON".
When in the diagnostic mode, the E.C.M. lamp will flash in a
sequence which can be read as a code number t o indicate that sys-
tem functions are normal or that a malfunction has been recorded.
A normal system operation (no malfunctions recorded) is identified
by code 12. Code 12 is read as follows:
I I I I I I I I I I I I
Seconds 10.5
1
1.0 10.510.510.51 3.0 10.51 1.0 10.510.5 10.51
The number of half second flashes preceding the one second pause
indicates the ten digits whilst the number of half second flashes fol-
lowing the one second pause indicates the unit digits. Codes are
repeated after a three second pause.
If no malfunctions are recorded, code 12 will continue until the diag-
nostic bridge is removed.
If a malfunction is recorded, only that malfunction code will be dis-
played as in code 12 above. If multiple malfunctions are recorded
each code will be displayed once in a predetermined sequence then
repeated.
Malfunction Codes
Within the E.C.M. microcomputer, a predetermined set of con-
ditions exists under which a malfunction code will be set. For
example, if a sensor voltage does not fall within the parameters that
the E.C.M. is programmed to expect under the existing conditions,
a code will be set. This code will refer to the circuit within which the
fault occurred (i.e.) the sensor, the wiring and connectors to it, and
the E.C.M.