Seville V8-300 4.9L (1991)
ISC motor to the minimum air setting.
15.
Using a T-25 "L-shape" Torx wrench or equivalent, loosen the TPS screw just enough to permit the sensor to be rotated. Open the throttle and
allow the throttle lever to snap shut against the minimum air screw. Adjust the TPS so the voltage is 0.475 to 0.525 volts. Go to step 16,
"Maximum ISC Extension Adjustment".
CAUTION: DO NOT use excessive force (don't pry or pound) to adjust the TPS because damage to the TPS or binding of the throttle shaft may
occur. The TPS mounting screws must be loosened to perform the adjustment.
ISC MAXIMUM EXTENSION CHECK AND ADJUSTMENT
16.
With the key ON, and the engine OFF select the ISC motor override E.5.3. Press the WARMER button on the ECC. The fuel data center should
display E.5.3 and "99" alternately indicating that override function has started. The ISC will extend to the maximum extend position.
17.
With the ISC at maximum extension the TPS voltage should be between 1.15 volts and 1.20 volts. If the TPS is not within this range, adjust the
ISC plunger as follows:
^
TPS below 1.15 volts.
^
Adjust the ISC plunger out by turning the plunger counterclockwise until the TPS parameter reads 1.18 volts.
^
TPS above 1.20 volts.
^
Adjust the ISC plunger in by turning the plunger clockwise until the TPS parameter reads 1.18 volts.
18.
Recheck the max extend setting. Press the COOLER button to retract the ISC plunger. Wait 5 seconds. Press the WARMER button and read the
TPS voltage. Readjust the ISC plunger if necessary.
AFTER ALL CHECK AND ADJUSTMENTS ARE COMPLETED
19.
While still in diagnostics turn ignition OFF. Allow approximately 20 seconds for the ISC motor to retract and perform a TPS learn routine.
20.
Re-enter diagnostics and repeat step 19. It takes 2 cycles for a successful TPS learn to occur.
21.
Remove the generator disable ground wire.
22.
START the engine and check for proper ISC motor operation.
