You must build the code reader circuit as described above.
ECC is on Pin 6
Read all the fault codes, if self adjustment of damper motors is required you should get fault code 5-1-1. If you have others you will need to fix these first.
Then use the procedure below:
SELF adjustment of damper motors 850 ECC
TEST MODE 4
1) Turn ignition on. Press button on code reader 4
times (for about one second each time). LED should illuminate.
2) Control codes must be entered one step at a time. LED should go off after each digit is entered. Entering each digit in a code must be made within 4 seconds, as failure to do so will abort input and TEST MODE 4 must be restarted.
Self-Adjustment Of Damper Motor Limit Positions
1) Turn ignition on. Place fan (blower motor) lever in manual
mode. Turn function selector to AUT (automatic). Ensure system is in
TEST MODE 4.
2) Enter control code 9-9-9 by pressing button on diagnostic
unit 9 times in quick succession. Enter each of the 9 series 3 times,
with a short pause in-between to allow LED to come on again. ECC
control module is now ready to adjust damper motor limit positions
automatically.
3) Wait about 10 seconds for fan to start. Turn ignition off
to exit TEST MODE 4. Turn ignition on. AC OFF and REC indicator on A/C
control panel should flash. Drive car for a few minutes at speeds
greater than 20 MPH.
4) Stop car and turn engine off, but leave ignition on for at
least 2 minutes to enable ECC control module to store all values.
Start TEST MODE 1 and record DTCs. If DTC 1-1-1 appears, selfadjustment
is complete. If DTC 5-1-1 appears, self-adjustment is not.
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