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Initial Inspection and Diagnostic Overview



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CLIMATE CONTROL SYSTEM - INSPECTION AND VERIFICATION

See the Tribute Wiring Diagram for schematic information.

Inspection and Verification

1. Verify the customer's concern by operating the climate control system to duplicate the condition.

2. Inspect to determine if one of the following mechanical or electrical concerns apply:Visual Inspection Chart





3. If the inspection reveals obvious concerns that can be readily identified, repair as necessary.

4. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).

NOTE:Make sure to use the latest scan tool software release.
5. If the scan tool does not communicate with the VCM:

- check the VCM connection to the vehicle.
- check the scan tool connection to the VCM.
- see Pinpoint Test 14: No Power To The Scan Tool, to diagnose no power to the scan tool.

NOTE:The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
6. If the scan tool does not communicate with the vehicle:

- verify the ignition key is in the ON position.
- verify the scan tool operation with a known good vehicle.
- see Pinpoint Test 15: The HVAC Module Does Not Respond To The Scan Tool, to diagnose no response from the EMTC module.

7. Carry out the network test.

- If the scan tool responds with no communication from one or more modules, see - Description and Operation.
- If the network test passes, retrieve and record the continuous memory DTCs.

8. Clear the continuous DTCs and carry out the self-test diagnostics from the PCM, and the EMTC module.

9. If the EMTC module DTCs retrieved are related to the concern, see Electronic Manual Temperature Control (EMTC) Module DTC Chart. If the PCM DTCs retrieved are related to the concern, see - PCM DTC Chart. For all other DTCs, see - Control Systems - Diagnostic Trouble Code (DTC) Chart - B, C And U Codes.

10. If no DTCs related to the concern are retrieved, see - Symptom Troubleshooting Chart - Climate Control.

EMTC Module - Diagnostic Methods

The EMTC module must be diagnosed by first retrieving any DTCs, if present.

- On-demand (hard fault) DTC indicates that the fault is currently present. An on-demand DTC suggest a wiring fault, disconnected connector or component failure.
- A continuous (intermittent) DTC alone (corresponding on-demand DTC is not present) indicates that the fault is an intermittent condition and may not be currently present. A continuous only DTC suggests a poor wiring connection, loose pin or terminal or intermittent component failure.
On-demand (hard fault) or continuous (intermittent fault) DTCs can be retrieved using a scan tool. If using a scan tool, refer to the scan tool operating manual. If no DTCs are present, see - Symptom Troubleshooting Chart - Climate Control for the appropriate diagnostic action.

EMTC Module - Cold Boot Process

The purpose of the cold boot process is to allow the EMTC module to reinitialize and calibrate the actuators. To carry out the cold boot process, follow the steps below.
1. Turn the ignition switch to the OFF position.

2. Disconnect the EMTC module electrical connectors.

3. Wait one minute.

4. Connect the EMTC module electrical connectors.

5. Turn the ignition switch to the ON position.

6. Select any position except OFF on the EMTC module.The EMTC module will now initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 seconds.

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