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.
Inspection and Verification: Notes
- Verify the customer's concern by operating the climate control system to duplicate the condition.
- Inspect to determine if one of the following mechanical or electrical concerns apply:
Visual Inspection Chart
- As pinpoint tests and measurements are being carried out, be sure to inspect for any disconnected, loose-fitting, or incorrectly installed component, module and in-line electrical connectors and pins.
- If the inspection reveals obvious concerns that can be readily identified, repair as necessary.
- If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the vehicle selection cannot be entered:
- check that the program card is correctly installed
- check the connections to the vehicle.
- check the ignition switch position.
- check that the battery voltage is greater than 9V.
If the Scan tool still does not allow the vehicle selection to be entered, refer to the scan tool manual.
- Carry out the Data Link Diagnostic Test using the scan tool. If the scan tool responds with:
- SCP+, SCP- OR UBP circuits fault=ALL MODULE NO RESPONSE/NOT EQUIPPED, go to Module Communication Network Diagnostics to diagnose the network concern.
- If the powertrain control module (PCM) is not listed for a communication concern, turn the A/C controls to OFF and execute the self-test diagnostics for the PCM.
- If the DATC module is not listed for a communication concern, execute the self-test diagnostics for the DATC module.
- If any PCM or DATC DTCs are retrieved, and are related to the concern, go to the POWERTRAIN CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX or the DUAL AUTOMATIC TEMPERATURE CONTROL (DATC) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX in this section to continue the diagnostics.
- If no DTCs related to the concern are retrieved, GO to Symptom Chart to continue the diagnostics.
- If the DATC module cannot be accessed by the scan tool, GO to PINPOINT TEST A .
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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