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:

Gauges and meters
Non-Optitron type meters Optitron type meters 1. Tachometer Displays the engine speed in revolutions per minute 2. Speedometer Displays the vehicle speed 3. Display change button 4. Engine coolant temperature gauge Displays the engine coolant tempe ...

Using the audio control function
Changing sound quality modes Type A Pressing selects the mode to be changed in the following order: “BAS”→“TRE”→“FAD”→“BAL”→“ASL” Type B and C Press . Press , , , or (type C only) as corresponds to the desired mod ...