Dtc C1551 Ig Power Supply Voltage Malfunction

Steering. Corolla. Zre142 Aze141
Power Assist Systems. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM (IG POWER SUPPLY)

INSPECT FUSE (ECU-IG NO. 1)

CHECK HARNESS AND CONNECTOR (BATTERY - POWER STEERING ECU)

DTC C1551 IG Power Supply Voltage Malfunction


DESCRIPTION

The power steering ECU distinguishes the ignition 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. 1 fuse
  2. IG power source circuit
  3. Power steering ECU

WIRING DIAGRAM


Corolla. Zre142 Aze141.Power Assist Systems.Power Steering System (For 2Az-Fe). Dtc C1551 Ig Power Supply Voltage Malfunction


INSPECTION PROCEDURE

NOTICE:
If the steering column assembly or power steering ECU has been replaced, perform the rotation angle sensor initialization and torque sensor zero point calibration (COROLLA_ZRE142 RM00000275305CX.html).
1.READ VALUE USING TECHSTREAM (IG POWER SUPPLY)

  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch on (IG).

  1. Turn the Techstream 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 Techstream.

    EMPS
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    IG power supply
    		IG power supply/
    Min.: 0 V
    Max.: 20.1531 V
    		11 to 14 V
    		Ignition switch on (IG)
    OK:
    The normal condition value is displayed on the Techstream.


NG
Go to step 2
OK

CHECK INTERMITTENT PROBLEMS

2.INSPECT FUSE (ECU-IG NO. 1)

  1. Remove the ECU-IG No. 1 fuse from the instrument panel junction block.

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

    Standard Resistance:
    Fuse
    		Condition
    		Specified Condition
    ECU-IG No. 1
    		Always
    		Below 1 Ω


NG
REPLACE FUSE
OK


3.CHECK HARNESS AND CONNECTOR (BATTERY - POWER STEERING ECU)


    Corolla. Zre142 Aze141.Power Assist Systems.Power Steering System (For 2Az-Fe). Dtc C1551 Ig Power Supply Voltage Malfunction

  1. Disconnect the connectors from the power steering ECU.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E32-6 (IG) - Body ground
    		Ignition switch on (IG)
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A75-2 (PGND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER STEERING ECU (COROLLA_ZRE142 RM000002XN605AX.html)