ABS and Tire Pressure Warning System
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- Eric Burns
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1 S and Tire Pressure arning System D Data Link 3 * : utomatic /C * : Except * SIL TC TS K 9 L P- 4 K 0 L 7 S Speed Sensor Rear LH 8 S Speed Sensor Rear RH I 5 I IL IL - R - R P- R G LG L - R P- R G J 7(), J 8() J 5(), J () LG L M +S D/G TC TS RL+ RL- RR+ RR- S 3 Skid Control ECU with ctuator INIT PK GND GND FL+ FR- FL- FR F (), F0(E), F(G) Fusible Link lock 30 S 3 G E - R 50 S FL MIN 3. 0 attery T 4 Tire Pressure arning Standardization S L- O 4 0 L- O 3 (*) 3 (*) J8 J 5(), J () P Parking rake S R- L 7 C 0 K 3 7 J 5(), J () 3 S Speed Sensor Front LH L- O 4 S Speed Sensor Front RH Y IE ED SIENN (ED3U)
2 From Power Source System (See Page 58) 0 STOP 0 ECU- IG 0 GUGE C C L S Stop Light S G- J - R 0 R R R 85 7 II3 J8 G- - R 3 P N P Park/Neutral Position S STP IG S 3 Skid Control ECU with ctuator SP 7 9 RL 30 TIR P 4 5 N Y II3 II3 J 5(), J () J0 Y- 005 SIENN (ED3U) 49
3 S and Tire Pressure arning System From Power Source System (See Page 58) 7. 5 GUGE 0 ECU- 5 H 8 C Tire Pressure C0 Combination Meter S RKE Speedometer - R L - L C 7 L Y- - R R - L J 7(), J 8() J9 Y- Y- J rake Fluid Level arning S R - L E IF SIENN (ED3U)
4 System Outline S system controls the respective brake fluid pressures acting on the disc brake cylinders of the four wheels when the brakes are applied in a panic stop, so that the wheels do not lock. This results in improved directional stability and steerability during panic braking. Tire pressure warning system turns on the tire pressure warning light and warns the driver of low tire pressure, when driving with a low tire pressure, which may cause trouble driving. However, this system can detect the low tire pressure condition only if one of the tires has such a condition in particular compared to other tires, and it cannot detect. Therefore, it can not detect natural (Gradual) air loss occurring to the tires.. Input Signals () Speed sensor signal The speed of the wheels is detected and input to TERMINLS FL+, FR+, RL+ and RR+ of the skid control ECU with actuator. () Stop light S signal signal is input to TERMINL STP of the skid control ECU with actuator when the brake pedal is operated. (3) Standardization S Signal signal is input to TERMINL INIT of the skid control ECU with actuator when the tire pressure warning standardization S in operated. (4) Parking position signal signal is input to TERMINL P of the skid control ECU with actuator when the Shift lever at P position. (5) Neutral position signal signal is input to TERMINL N of the skid control ECU with actuator when the Shift lever at N position.. S System Operation During sudden braking the skid control ECU with actuator has signals input from each sensor, which controls the current to the solenoid inside the actuator and lets the hydraulic pressure acting on each wheel cylinder escape to the reservoir. The pump inside the actuator is also operating at this time, and it returns the brake fluid from the reservoir to the master cylinder, thus preventing locking of the vehicle wheels. If the skid control ECU with actuator judges that the hydraulic pressure acting on the wheel cylinder is insufficient, the current on the solenoid is controlled and the hydraulic pressure is increased. Holding of the hydraulic pressure is also controlled by the skid control ECU with actuator, by the same method as above. Pressure reduction, holding and increase are repeated to maintain vehicle stability and to improve steerability during sudden braking. 3. Operation of Tire Pressure arning System In accordance with the reduction of tire pressure, tire diameter becomes small and the tire rotation speed becomes greater. In the relation between the difference of the vehicle speed of normal wheels and the low pressure wheel and the tire pressure, based on the speed signal detected during driving, it detects the change of the tire pressure. s a result, if the system judges that the tire pressure has reduced, it turns on the tire pressure warning light and warn the driver using the signal from the skid control ECU with actuator. Service Hints S3 Skid Control ECU with ctuator, 4-Ground : lways approx. volts 3-Ground : pprox. volts with the ignition S at ON position -Ground : pprox. volts with the brake pedal depressed, 3-Ground : lways continuity 3, 4 S Speed Sensor Front LH, RH - : pprox..07 kω (0 C, 8 F) 7, 8 S Speed Sensor Rear LH, RH - : pprox.. kω (5 C, 77 F) S Stop Light S - : Closed with the brake pedal depressed 005 SIENN (ED3U) 5
5 S and Tire Pressure arning System : Parts Location Code See Page Code See Page Code See Page 3 3 F0 E 3 J F G 3 J J 33 J J 33 P 33 3 J5 3 P 37 C0 35 J 3 S3 33 D 35 J7 3 S 37 F 3 J8 3 T4 37 : lock and ire Harness Code See Page lock and ire Harness ( Location) C 7 Engine Room Main ire and Driver Side J/ (Lower Finish Panel) H K Instrument Panel ire and Driver Side J/ (Lower Finish Panel) 7 L C Engine Room Main ire and Engine Room J/ (Engine Compartment Left) : Joining ire Harness and ire Harness Code See Page Joining ire Harness and ire Harness ( Location) I 4 Engine Room Main ire and Floor No. ire (Left Cowl Side Panel) II3 48 Engine ire and Instrument Panel ire (Right Kick Panel) IL 48 Engine Room Main ire and Floor No. ire (Right Kick Panel) : Ground Points Code See Page Ground Points Location E 44 Front Side of the Right Fender pron ED 44 Front Side of the Left Fender pron IE 4 Left Kick Panel IF 4 Instrument Panel race LH SIENN (ED3U)
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