Symptom Charts

SYMPTOM CHART-STEERING SYSTEM

Condition	Possible Sources	Action
Steering has lack of assist or inconsistent assist	Steering gear Power steering pump Restricted power steering lines/hoses	GO to PINPOINT TEST A .
Excessive steering wheel play	Steering gear Steering column Steering column shaft/coupling Steering linkage Ball joints Strut bearing plate	GO to PINPOINT TEST B .
Steering system drift/pull/wander	Unevenly loaded vehicle	CORRECT the vehicle loading as necessary.
Steering system drift/pull/wander	Tire pressure Wheel alignment Steering gear Steering column shaft/coupling Frame alignment	GO to PINPOINT TEST C .
Poor returnability/sticky steering	Binding steering column shaft/coupling U-joints	INSTALL a new steering column shaft. Refer to STEERING COLUMN SHAFT for the procedure.
	Loose, worn or damaged steering linkage	GO to STEERING LINKAGE TEST in this article.
	Binding suspension components	Refer to the appropriate SUSPENSION SYSTEM-GENERAL INFORMATION article for the procedure, to continue the suspension diagnosis.
	Binding steering column bearing(s)	INSTALL a new steering column. Refer to STEERING COLUMN for the procedure.
	Binding dash boot seal	INSTALL a new dash boot seal. Refer to STEERING COLUMN SHAFT for the procedure.

SYMPTOM CHART - STEERING NOISE/VIBRATION

Condition	Possible Sources	Action
Steering system cold start noise	Blockage in the power steering fluid reservoir caused by power steering fluid contamination	NOTE: Some noise during an extremely cold start (-12.2°C [-10°F]) is normal and should improve as the steering system warms up (usually within 60 seconds). NOTE: It may be necessary to remove the power steering fluid reservoir to flush contamination trapped in the reservoir screen. CHECK the power steering fluid reservoir for contamination. FLUSH the power steering system as necessary. REFER to POWER STEERING SYSTEM FLUSHING in this article.
Steering system cold start noise	Air in the steering hydraulic system (aerated fluid)	CHECK for leaks in the system. REFER to POWER STEERING FLUID LEAK TEST . PURGE the air from the system. REFER to POWER STEERING SYSTEM PURGING in this article.
Steering grunt or shudder - occurs when turning into or out of a turn at low speeds (temperature sensitive)	Air in the steering hydraulic system (aerated fluid)	CHECK for leaks in the system. REFER to POWER STEERING FLUID LEAK TEST . PURGE the air from the system. REFER to POWER STEERING SYSTEM PURGING in this article.
	Steering gear or power steering hoses	GO to STEERING GEAR GRUNT/SHUDDER TEST in this article.
Steering system clonk - hydraulic knocking sound	Air in the steering hydraulic system (aerated fluid)	NOTE: Some amount of clonk noise is considered acceptable. If in doubt of the acceptability, compare to another vehicle. CHECK for leaks in the system. REFER to POWER STEERING FLUID LEAK TEST . PURGE the air from the system. REFER to POWER STEERING SYSTEM PURGING in this article.
Power steering pump moan - loud humming noise occurs when the steering wheel is rotated to the stop position. Produces a 120-600 Hz frequency that changes with rpm	Low fluid	CHECK the fluid level. FILL as necessary. REFER to POWER STEERING SYSTEM FILLING in this article.
	Air in the steering hydraulic system (aerated fluid)	CHECK for leaks in the system. REFER to POWER STEERING FLUID LEAK TEST . PURGE the air from the system. REFER to POWER STEERING SYSTEM PURGING in this article. If a pump moan still exists, INSTALL a new power steering pump. Refer to POWER STEERING PUMP for the procedure.
	Power steering fluid reservoir or screen is blocked or damaged	INSPECT the reservoir. Flush or INSTALL an new reservoir as necessary.
	Power steering line/hose grounded to chassis	INSPECT the power steering lines/hoses. REPAIR as necessary.
	Power steering pump brackets loose or misaligned	CHECK bolts, brackets and bracket alignment. TIGHTEN bolts to specification. REPAIR or INSTALL new brackets as necessary. Refer to the appropriate POWER STEERING article for the procedure.
	Steering gear isolators	INSPECT the isolators for wear or damage. REPAIR as necessary.
Steering gear clunk - occurs only while cornering over a bump (can be temperature sensitive)	Steering gear	INSPECT the steering gear for loose mounting bolts. TIGHTEN to specification as necessary. Refer to STEERING GEAR for the procedure.
Feedback (rattle, chuckle or knocking noise in the steering gear) - roughness is felt in the steering wheel when the vehicle is driven over rough surfaces	Steering column shaft/coupling joints damaged or worn	INSTALL a new steering column shaft. Refer to STEERING COLUMN SHAFT for the procedure.
	Loose, damaged or worn tie-rod ends	INSPECT and INSTALL new tie-rod ends as necessary. GO to STEERING LINKAGE TEST in this article.
	Steering gear insulators or mounting bolts loose or damaged	TIGHTEN the bolts to specification or INSTALL new bolts as necessary. Refer to STEERING GEAR for the procedure.
	Steering column shaft/coupling bolts are loose	TIGHTEN the bolts to specification. Refer to STEERING COLUMN SHAFT for the procedure.
	Steering column damaged or worn	REPAIR or INSTALL a new steering column as necessary. Refer to STEERING COLUMN for the procedure.
	Loose suspension bushings, bolts or ball joints	INSPECT the suspension system. TIGHTEN the bolts to specification or INSTALL new components as necessary. Refer to SUSPENSION SYSTEM-GENERAL INFORMATION the appropriate article for the procedure.
Accessory drive belt squeal/chirp - when rotating the steering wheel from stop-to-stop	Loose or worn accessory drive belt	ADJUST or INSTALL a new accessory drive belt as necessary. Refer to ACCESSORY DRIVE BELT the appropriate article for the procedure.
Power steering hiss or whistle	Steering column shaft/coupling-to-steering gear is binding or misaligned	REPAIR or INSTALL a new steering column shaft as necessary. Refer to STEERING COLUMN SHAFT for the procedure.
	Grounded or loose steering column boot at the dash panel	REPAIR as necessary.
	Damaged or worn steering gear input shaft and valve	REPAIR or INSTALL a new steering gear as necessary. Refer to STEERING GEAR for the procedure.
	Power steering pump low relief pressure	GO to PINPOINT TEST A .
	Restricted power steering lines/hoses	GO to PINPOINT TEST A .
Steering column rattle	Loose bolts or attaching brackets	TIGHTEN the bolts to specification.
	Loose, worn or insufficiently lubricated column bearings	LUBRICATE bearings or INSTALL new steering column bearings or steering column as necessary. Refer to STEERING COLUMN for the procedure.
	Steering shaft insulators damaged or worn	INSTALL new insulators. Refer to STEERING COLUMN SHAFT for the procedure.
	Steering column shaft/coupling compressed or extended	INSPECT the rubber spider coupling for damage. INSTALL a new intermediate/flexible shaft. Refer to STEERING COLUMN SHAFT for the procedure.
Steering gear squeak	Incorrect power steering fluid in system	If incorrect power steering fluid is suspected, FLUSH the power steering system. REFER to POWER STEERING SYSTEM FLUSHING . If noise persists after system flush, INSTALL a new steering gear. Refer to STEERING GEAR for the procedure.
	Steering gear rotary seal	NOTE: Use the chassis ears to verify that the steering gear is the source of the noise. It may be necessary to replicate the customer operating conditions (fluid temperature, turning rate of steering wheel) to get the squeak to reoccur. INSTALL a new steering gear as necessary. Refer to STEERING GEAR for the procedure.
	Stone shield (if equipped)	Make sure that the stone shield is correctly installed and that it is not making contact with the steering shaft. REPOSITION stone shield or INSTALL a new stone shield as necessary.
Steering column squeak, cracks or grinds	Insufficiently lubricated steering shaft bushings	LUBRICATE the steering shaft and shaft tube seals.
	Loose or misaligned steering column shrouds	TIGHTEN or ALIGN the steering column shrouds.
	Steering wheel rubbing against steering column shrouds	REPOSITION the steering column shrouds.
	Upper or lower bearing sleeves out of position	REPOSITION the bearing sleeves.
Power steering pump noisy	Power steering pump	INSTALL a new power steering pump as necessary. Refer to POWER STEERING PUMP for the procedure.
Power steering pump relief noise	Power steering fluid flow into the bypass valve of the pump valve housing, with fluid temperature below 54°C (130°F)	Acceptable condition.
Power steering pump whine noise	Aerated fluid	CHECK for a leak in the system. REFER to POWER STEERING FLUID LEAK TEST . PURGE the air from the system. REFER to POWER STEERING SYSTEM PURGING .
Power steering pump whine noise	Damaged power steering pump	INSTALL a new power steering pump as necessary. Refer to POWER STEERING PUMP for the procedure.