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P0506-IDLE SPEED PERFORMANCE LOWER THAN EXCEPTED (CONTINUED) 3. 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. Verify that the throttle cable between the Accelerator Pedal and APPS is not binding. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands Were any problems found or does the idle fluctuate while tapping on the ETC Motor? Yes >> Repair or replace as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 4 4. 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) HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 543 |