Toyota 4Runner: High Engine Revolution Signal (C1544)

Toyota 4Runner Service Manual / Steering / Power Assist Systems / Power Steering System / High Engine Revolution Signal (C1544)

DESCRIPTION

The power steering ECU assembly receives engine speed signals from the ECM via CAN communication. The power steering ECU assembly provides appropriate assisting force in accordance with the engine speed signal.

DTC Code	DTC Detection Condition	Trouble Area
C1544	An abnormal engine speed signal is received.	SFI system CAN communication system Power steering ECU assembly

PROCEDURE

1.	CHECK OTHER DTC OUTPUT (CAN COMMUNICATION SYSTEM)

(a) Check if DTC U0100 is output (See page ).

Result

Result	Proceed to
DTC U0100 is not output	A
DTC U0100 is output	B

HINT:

DTC U0100 indicates a CAN communication malfunction in the power steering system.

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

2.	CHECK OTHER DTC OUTPUT (SFI SYSTEM)

(a) Using the Techstream, check for DTCs and confirm that there are no problems in the SFI system (See page ).

Result

Result	Proceed to
DTC is not output	A
DTC is output	B

REPLACE POWER STEERING ECU ASSEMBLY

GO TO SFI SYSTEM (DIAGNOSTIC TROUBLE CODE CHART)

Vehicle Speed Signal (C1541)

DESCRIPTION The power steering ECU assembly receives vehicle speed signals from the master cylinder solenoid (skid control ECU) via CAN communication. The power steering ECU assembly provides app ...

Power Steering Warning Light Circuit

DESCRIPTION The power steering ECU assembly is connected to the combination meter assembly via CAN communication. If the power steering ECU assembly detects a malfunction, the power steering warn ...

Other materials about Toyota 4Runner:

Engine (ignition) switch (vehicles without a smart key system)
Starting the engine Check that the parking brake is set. Check that the shift lever is set in P. Firmly depress the brake pedal. Turn the engine switch to the “START” position to start the engine. Changing the engine switch positions 1. � ...

Removal
REMOVAL CAUTION / NOTICE / HINT NOTICE: When installing, coat the parts indicated by arrows with lithium soap base glycol grease (See page ). As high pressure is applied to the brake actuator tube No. 1, never deform it. Do not turn ...