GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Sonoma Pickup - 4WD 🢒 Engine 🢒 Engine Controls - 2.2L 🢒 Symptoms

Important Preliminary Checks

Before Starting

Before using this section you should have performed the Powertrain On-Board Diagnostic (OBD) System Check and determined that the following items are OK:

    • The PCM and MIL, check engine, are operating correctly.
    • There are no DTCs stored.
    • Scan tool data is within normal operating range, refer to Scan Tool Data List .

Verify the customer complaint, and locate the correct symptom in the table of contents. Check the items indicated under that symptom.

Visual/Physical Check

Several of the symptom procedures call for a careful visual and physical check. The importance of this step cannot be stressed strongly enough. This step can lead to correcting a problem without further checks and can save valuable time. This check should include:

    • PCM grounds for the following conditions:
       - Clean connection
       - Tight connection
       - Proper location
    • Vacuum hoses for the following conditions:
       - Splits
       - Kinks
       - Proper connections as shown on Vehicle Emission Control Information label
       - Leaks
       - Restrictions
    • Air leaks at the following components:
       - Throttle body mounting
       - Intake manifold sealing surfaces
    • Wiring for the following conditions:
       - Proper locations
       - Pinches
       - Cuts
    • Use the following tables when diagnosing a symptom complaint:
       -  Hard Start
       -  Surges/Chuggles
       -  Lack of Power, Sluggishness, or Sponginess
       -  Detonation/Spark Knock
       -  Hesitation, Sag, Stumble
       -  Cuts Out, Misses
       -  Poor Fuel Economy
       -  Rough, Unstable, or Incorrect Idle and Stalling
       -  Dieseling, Run-On
       -  Backfire