Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Powertrain Diagnostic Procedures: Introduction: Notes
The procedures contained in this service information include specifications, instructions, and graphics needed to diagnose the PCM Powertrain System . The diagnostics in this service information are based on the failure condition or symptom being present at the time of diagnosis.
Please follow the recommendations below when choosing your diagnostic path.
- First make sure the Scan Tool is communicating with the appropriate modules; i.e., if the Scan Tool displays a "No Response" condition, you must diagnose this first before proceeding.
- Read DTCs (diagnostic trouble codes) with a Scan Tool.
- If no DTCs are present, identify the customer complaint.
- Once the DTC or customer complaint is identified, locate the matching test in DIAGNOSTIC INFORMATION AND PROCEDURES and begin to diagnose the symptom.
All component location views are in COMPONENT LOCATIONS .
All connector pinouts are in CONNECTOR PINOUTS . All system schematic diagrams are in SCHEMATIC DIAGRAMS . All charts and graphs are in CHARTS AND GRAPHS .
An * placed before the symptom description indicates a customer complaint.
When repairs are required, refer to the appropriate service information for the proper removal and repair procedure.
Diagnostic procedures change every year. New diagnostic systems may be added; current systems may be enhanced. READ THIS SERVICE INFORMATION BEFORE TRYING TO DIAGNOSE A VEHICLE DTC. It is recommended that you review the service information to become familiar with all new and enhanced diagnostic procedures.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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