Engine Performance Diagnostic Routine.pdf

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GENERAL INFORMATION

Engine Performance Diagnostic Routine Outline

WHERE DOES DRIVEABILITY DIAGNOSIS START?

PERFORM BASIC INSPECTION

1. Verify Customer Complaint

2. Perform Visual Inspection

(See Basic Diagnostic Procedures)

3. Test Engine Sub-Systems

(See Basic Diagnostic Procedures)

Mechanical Condition (Compression)

Ignition Output

Fuel Delivery

4. Check Air Induction System For Leaks

5. Check & Adjust Basic Engine Settings

(See On-Vehicle Adjustments)

Ignition Timing

Idle Speed

CHECK FOR TROUBLE CODES

1. Check for Diagnostic Trouble Codes (DTCs).

(See Self-Diagnostics)

2. Repair cause of DTCs.

3. Clear PCM memory and repeat self-test.

DIAGNOSE SYMPTOM

1. If no self-diagnostics available, or no trouble codes present, identify symptom.

2. See trouble shooting procedure to identify problem.

(See Trouble Shooting - No Codes)

TEST SYSTEM

1. Perform required tests.

(See Systems & Component Testing)

2. Verify complaint is repaired.