Ascender 2WD L6-4.2L (2003)
Step 4
Test Description
The number below refers to the step number on the diagnostic table.
4. If the battery positive voltage and ground circuits of the DLC are functioning properly. The malfunction must be due to the scan tool.
Symptom Based Diagnosis
Symptoms - Data Link Communications
Important: The following steps must be completed before using the symptom tables.
1. Perform the applicable diagnostic system check before using the Symptom Tables in order to verify that there are no DTCs set.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to Data Link Communications Description and
Operation.
Visual/Physical Inspection
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Inspect for aftermarket devices which could affect the operation of the vehicle systems.
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Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions.Refer to Diagnostic Aids for Circuit Testing amd Wiring Repair
procedures.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
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Scan Tool Does Not Power Up
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Scan Tool Does Not Communicate with Class 2 Device
