Toyota 4Runner manuals

Toyota 4Runner: 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.


B

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


A

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


A

REPLACE POWER STEERING ECU ASSEMBLY


B

GO TO SFI SYSTEM (DIAGNOSTIC TROUBLE CODE CHART)

Vehicle Speed Signal (C1541)
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Power Steering Warning Light Circuit
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Other materials about Toyota 4Runner:

How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: The ECM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system. *: Use the Techstream. PRO ...

Removal
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