If you do not have access to a laptop computer, it is
still possible to access the diagnostic trouble codes
stored in the memory of the Spectrum system ECM
using a diagnostic jumper and the malfunction indicator
lamp. With the key OFF, connect the diagnostic
jumper to the DLC located near the ECM. The
jumper will connect diagnostic pins A and D. Turn
the ignitionONbut do not start the vehicle. Themalfunction
indicator lamp (MIL) will begin to flash.
The MIL displays three digit codes by flashing the
first digit, pausing, then flashing the second digit,
pausing, and then flashing the third digit. There will
be a long pause between codes. For example, a code
143 would be one flash followed by four flashes followed
by three flashes.
The MIL will first display a 166 three times. Code
166 indicates that the ECM based diagnostic routines
are functioning. Then, any Diagnostic Trouble
Codes stored in memory will display three times
each. The MIL will then start over with the code 166.
If the vehicle is started while the diagnostic jumper
is in place, the MIL will flash rapidly.
Diagnostic Trouble Codes may be cleared from the
system ECM memory by moving the ignition key to
the OFF position and removing the (F2) system battery
fuse for at least 15 seconds.
NOTE: This will erase all of the memory in the computer
including the adaptive learn.