Servotronic Systems

Steering Difficult When Vehicle Stationary, Engine Idling Or During Slow Driving
1. No voltage supply at Servotronic control unit. Check voltage supply.
2. Wiring from Servotronic control unit to Servotronic valve defective. Check wiring.
3. Electrical fault in Servotronic valve. Check Servotronic valve.
4. Servotronic control unit defective. Replace Servotronic control unit as a test. If fault is not eliminated, install original control unit.
5. Hydraulic defect in steering system. Check pump pressure, if satisfactory, replace steering gear. If not, replace pump.

Steering Effort Too Light At Higher Speeds
1. Servotronic control unit defective. Replace Servotronic control unit as a test. If fault is not eliminated, install original control unit.
2. No speed signal at Servotronic control unit. Check wiring and connection. Speed signal can also be suppressed or falsified by faults in other systems.
3. Oil strainer or port in Servotronic valve blocked. Clean strainer, then replace Servotronic valve, if necessary.

Steering Effort Too Heavy Intermittently
1. Servotronic valve wiring has short to ground. Check wiring and connections to valve.

Steering Effort Too Light Intermittently
1. Servotronic valve wiring is shorted. Check wiring and connections to valve.

Steering Satisfactory While Idling When Vehicle Stationary, But Too Heavy When Driving
1. Servotronic control unit defective. Replace Servotronic control unit as a test. If fault is not eliminated, install original control unit.
2. Hydraulic defect in steering system. Replace steering gear.

Steering Effort Unequal For Left And Right Turns
1. Hydraulic defect in steering system. Replace steering gear.