A Symptoms

SYMPTOMS

IMPORTANT PRELIMINARY INSPECTIONS BEFORE STARTING
Perform the Diagnostic System Check - Vehicle in Vehicle DTC Information and verify all of the following items:
- The powertrain control module (PCM) and malfunction indicator lamp (MIL) are operating correctly.
- Ensure no DTCs are stored.
- Scan tool data is within normal operating range. Refer to Scan Tool Data List. Scan Tool Data, Normal Values and Definitions
- Verify the customer concern.
- Perform the Visual/Physical Check in this section.

VISUAL/PHYSICAL CHECK
Several of the symptom procedures call for a careful visual and physical inspection. This can lead to correcting a condition without further tests and can save valuable time. This inspection should include the following areas:
- Inspect the PCM grounds for being clean, tight, and in their proper location.
- Inspect vacuum hoses for splits, kinks, and proper connections, as shown on Vehicle Emission Control Information label. Inspect thoroughly for any type of leak or restriction.
- Inspect the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking, especially between the mass air flow (MAF) sensor and the throttle body.
- Inspect for air leaks at throttle body mounting area, MAF sensor and intake manifold sealing surfaces.
- The ignition wires are not cracked, brittle, or carbon tracked.
- Inspect the wiring harness for poor connections, pinches, cuts, or other damage.
- Inspect for loose, damaged, or missing sensors/components.

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
- Poor Fuel Fill Quality
- Rough, Unstable, or Incorrect Idle and Stalling
- Dieseling, Run-On
- Backfire
- Malfunction Indicator Lamp (MIL) Inoperative
- Malfunction Indicator Lamp (MIL) Always On
- Engine Cranks but Does Not Run