Computed timing check (1984-1991 eec-iv vehicles), Caution – Actron Professional Enhanced Scan Tool 9640A User Manual
Page 64
Ford Historic Self-Test Routines
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6
❒
If Applicable, set Octane Switch To Premium.
The tool will prompt the user to:
❒
Work Steering Wheel
❒
Pump Brake Pedal & Cycle OD (overdrive) Cancel Switch.
✓
Observe Screen for Prompt to Perform the next action.
❒
Quickly Press And Release Throttle. One Time Only!
After performing these steps, wait for
the tool to retrieve DTCs. When the test
is done, turn Ign Key OFF and press
ENTER
.
Use the
DOWN
arrow key to begin view-
ing codes.
If no problems exist, Code 11 or 111 will
be displayed.
If vehicle problems exist, codes are set.
Use
UP/DOWN
arrow keys to view
codes. Write down codes for reference.
When done, press
FUNC
to return to the
Ford Function List screen.
Computed Timing Check (1984-1991 EEC-IV Vehicles)
This option of the
KOER Read Codes
function allows you to check both the
“Base” engine timing (no computer adjustment) and the ability of the computer
to control spark advance.
✓
This does not apply to 7.3L diesel vehicles.
Connect a
Timing Light
to the vehicle in accordance with the manufacturer’s
instructions. (For 2.3L dual plug engines, use exhaust side plug. Refer to igni-
tion system section in vehicle service manual for specific instructions.)
Select
Computed Timing
and press
ENTER
.
Follow the instructions step-by-step.
Failure to perform these steps may set a
false DTC in the PCM — observe the
display.
Avoid Cooling Fan! It May Turn On During Test.
Test Completed
Turn Ign Key Off.
Press ENTER To Cont
Use to view Codes.
Write Down Codes
For Reference.
[
~
KOER Code
111
System Pass Code
No Faults Detected [
During KOER Test ~
KOER Code
326
PFE/DPFE EGR Sensor]
Below Min. Voltage [
~
Select Code Type
1)Fast Codes
2)Slow Codes
` 3)Computed Timing
!
CAUTION