Speed Sensor Malfunction - Electronic Power Steering System

POWER STEERING: ELECTRONIC POWER STEERING SYSTEM: C1541/41: Speed Sensor Malfunction

DTC C1541/41 - Speed Sensor Malfunction

DTC C1542/42 - Speed Sensor Malfunction

DTC C1571/71 - Speed Sensor Malfunction (Test Mode DTC)

DESCRIPTION

The power steering ECU controls the assisting power in accordance with the vehicle speed signals from the combination meter.
HINT: These DTCs are only for vehicles without a skid control ECU (ABS ECU).
When the sensor is normal, a pulse signal (43 Hz at 37 mph [60 km/h]) that alternates between 0 V and 5 V is transmitted to the ECU.





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Confirm that DTC C1571/71 has been cleared by activating test mode after the repair is completed.

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the tester on.
(d) Enter the following menus: Chassis / EMPS /Data List.
(e) According to the display on the tester, read the "Data List".
OK:
Speed values are same.
HINT: There is tolerance of +/- 10 % in the speedometer indication.

OK -- CHECK INTERMITTENT PROBLEMS
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - COMBINATION METER)




(a) Disconnect the connectors from the power steering ECU and the combination meter.
(b) Measure the resistance.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- GO TO COMBINATION METER SYSTEM