Diagnostic Tests: Notes

CAUTION: Ensure ignition switch is in OFF position when disconnecting ECM or performing resistance tests.

NOTE: Perform all resistance and voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm impedance, unless stated otherwise in test procedures.

Using scan tool, display and record Diagnostic Trouble DTCs (DTCs). See ENTERING ON-BOARD DIAGNOSTICS under SELF-DIAGNOSTIC SYSTEM section. If scan tool is blank, see SCAN TOOL WILL NOT COMMUNICATE . If no DTCs are displayed, see TESTS W/O CODES article.

Clear DTCs. See CLEARING DTCS under SELF-DIAGNOSTIC SYSTEM section. Road test vehicle (if necessary) and attempt to duplicate conditions that caused original complaint. Recheck for DTCs. If no DTCs are displayed, go to INTERMITTENT DTCS . If one or more DTCs are displayed, repair DTCs in order, starting with lowest numbered DTC. Clear DTCs after each repair. Recheck for DTCs to confirm repair.