DTC    C1551    IG Power Supply Voltage Malfunction

for Preparation Click here


DESCRIPTION

The power steering ECU assembly distinguishes the power switch status as on (IG) or off through the IG power source circuit.

DTC No.
DTC Detection Condition
Trouble Area
C1551
IG power source circuit malfunction inside ECU
  1. ECU-IG No. 2 fuse
  2. IG power source circuit
  3. Power steering ECU assembly

WIRING DIAGRAM


C113532E38


INSPECTION PROCEDURE

NOTICE:
If the steering column assembly or power steering ECU assembly has been replaced, perform rotation angle sensor value initialization and torque sensor zero point calibration (Click here).

HINT:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.READ VALUE USING INTELLIGENT TESTER (IG POWER SUPPLY)

  1. Turn the power switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / EMPS / Data List.

  1. Select the item "IG power supply" in the Data List and read the value displayed on the intelligent tester.

    EMPS 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    IG power supply
    		IG power supply/
    Min.: 0 V
    Max.: 20.1531 V
    		9 to 16 V
    		Power switch on (IG)

    OK:
    The normal condition value is displayed on the intelligent tester.



NG
Go to step 2
OK

CHECK INTERMITTENT PROBLEMS (Click here)  

2.CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - POWER STEERING ECU ASSEMBLY)


    C113533E31

  1. Disconnect the connectors from the power steering ECU assembly.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H25-6 (IG) - Body ground
    		Power switch on (IG)
    		9 to 16 V

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A26-2 (PGND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Power Steering ECU Assembly)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER STEERING ECU ASSEMBLY (Click here)