Hydraulic Pressure
B: MEASUREMENT OF HYDRAULIC PRESSURECAUTION:
^ Be sure to complete all items aforementioned in "STEERING CONDITION", prior to measuring hydraulic pressure. Refer to Steering; Testing and Inspection; Procedures. Otherwise, pressure can not be measured correctly.
^ Do not leave the valve of pressure gauge closed or hold the steering wheel at stop end for 5 seconds or more in any case, as the oil pump may be damaged due to long keep of these conditions.
^ Put cotton cloth waste at a place where fluid drops before pressure gauge is installed. Wipe off split fluid thoroughly after the measurement.
NOTE: Keep engine idling during the measurement.
1B1 : Measure Regular Pressure
1. Install STs to power steering pump.
1) Drain the power steering fluid about 0.35 l (0.4 US qts., 0.3 Imp. qts.) from oil tank.
2) Remove two bolts securing power steering pipes to engine.
3) Install ST1, 2 and 3 between power steering pump and pipes using gasket (Part No. 34621AC020) and bolt (Part No. 34620AC010). ST1 925711000 PRESSURE GAUGE ST2 34099AC020 ADAPTER HOSE B ST3 34099AC010 ADAPTER HOSE A
4) Replenish power steering fluid up to specified level.
2. Open valve, and start the engine.
3. Measure regular pressure.
Check: Is pressure 981 kPa (10 kg/cm2, 142 psi) or less?
Yes: Go to step 1B2.
No: Trouble may be due to crushed pipe or hose, leakage from fluid line, foreign particles in fluid line, etc. Replace faulty parts with new ones.
1B2: Measure Relief Pressure
1. Using STs, measure relief pressure. ST1 925711000 PRESSURE GAUGE ST2 34099AC020 ADAPTER HOSE B ST3 34099AC010 ADAPTER HOSE A
2. Close valve.
Check: Is pressure 7,159 - 7,748 kPa (73 - 79 kg/cm2, 1,038 - 1,123 psi)?
Yes: Go to step 1B3.
No: Trouble may be due to malfunctioning relief valve, fluid leaking into oil pump interior, abnormal wear of pump vanes, etc. Replace with new oil pump.
1B3: Measure Working Pressure
1. Using STs, measure working pressure. ST1 925711000 PRESSURE GAUGE ST2 34099AC020 ADAPTER HOSE B ST3 34099AC010 ADAPTER HOSE A
2. Open valve.
3. Measure working pressure of control valve by turning wheel from stop to stop.
Check: Is pressure 7,159 - 7,748 kPa (73 - 79 kg/cm2, 1,038 - 1,123 psi)?
Yes: Measure steering force.
No: Control valve is inoperative. Replace control valve itself or control valve and pinion as a single unit with new ones.