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3. VACUUM LEAKS Start the engine. Inspect the vehicle for external vacuum leaks. Inspect the engine for internal leaks. Were any vacuum leaks found? Yes >> Repair the vacuum leak as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 4 4. THROTTLE BODY OPERATION Inspect the throttle body for carbon build up, other restrictions, and a bent throttle plate using a straight edge. If the throttle plate does not close entirely it may be bent and needs to be replaced. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands Were any problems found? Yes >> Repair or replace as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 5 5. PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal Were there any problems found? Yes >> Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Replace and program the Powertrain Control Module per Service Information. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 508 ENGINE ELECTRICAL DIAGNOSTICS LX |