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Preliminary Checks: Notes

Before using this section, perform On-Board Diagnostic (OBD) System Check and verify following items:

Powertrain Control Module (PCM), Malfunction Indicator Lamp (MIL) and Reduced Power Lamp (RPL) are operating correctly.
There are no DTC(s) stored.
Tech 2 data is within normal operating range. See TYPICAL SCAN TOOL VALUES in PIN VOLTAGE CHARTS article.
Verify customer complaint and perform appropriate test. See SYMPTOM DIAGNOSIS under SYMPTOMS.