Spectrum 3.0L GM, Parts & Service Manual

Page: 34 / 327

34
Step Action Values Yes No
24 Was the Adaptive 1 fuel correction less than -15%?
Go to Step
(26)
Go to
Step (25)
25 Was the Adaptive 1 fuel correction more than +15%?
Go to Step
(27)
NA
26
Engine is running RICH (system is trying to compensate by de-
creasing the amount of fuel). Check the following for any
condition which may cause the engine to run RICH:

Ignition system (See Step 7).

Air cleaner and intake system (including vehicle intake
ducting) for airflow obstructions.

Exhaust system for flow obstructions.

HEGO for correct switching characteristics.
Are all actions complete?
Go to Step
(28)
NA
27
Engine is running LEAN (system is trying to compensate by
increasing the amount of fuel). Check the following for any
condition which may cause the engine to run LEAN:

Intake manifold for leaks.

All throttle body gaskets or o-rings for leaks.

All vacuum hoses and fittings for leaks.

Exhaust system for leaks
NOTE: Exhaust system leaks allow for excess O
2
to dilute the
HEGO sensor giving a false reading. Engine may exhibit signs
of a rich running condition but the Adaptive 1 corrections will
indicate an excessive positive fuel adjustment.

HEGO for correct switching characteristics.
Are all actions complete?
Go to Step
(28)
NA
28 Repeat Step 20. NA NA
29

Remove all test equipment except the DST.

Connect any disconnected components, fuses, etc.

Using the DST clear DTC information from the ECM.

Turn the ignition OFF and wait 30 seconds.

Start the engine and operate the vehicle to full operating
temperature

Observe the MIL

Observe engine performance and driveability
Does the engine operate normally with no stored codes?
Remove all diagnostic equipment and return vehicle to original
condition. Return vehicle to customer.
NA NA