C1541

POWER STEERING: POWER STEERING SYSTEM: C1541/41,C1542/42,C1571/71: Speed Sensor Malfunction
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 Techstream on.

(d) Enter the following menus: Chassis / EMPS /Data List.

(e) Select the item "Meter Vehicle Velocity" in the Data List and the value displayed on the Techstream.

EMPS

EMPS:

OK:

When the vehicle is being driven at 12.4 mph (20 km/h) the Techstream displays a speed within the range of 11.1 to 13.6 mph (18 to 22 km/h).

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