C1551

POWER STEERING: POWER STEERING SYSTEM: C1551: IG Power Supply Voltage Malfunction

DTC C1551 - IG Power Supply Voltage Malfunction

DESCRIPTION

The power steering ECU distinguishes the ignition switch status as ON or OFF through the IG power source circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE
NOTE: If the steering column or power steering ECU has been replaced, perform the rotation angle sensor initialization and torque sensor zero point calibration .

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (IG POWER SUPPLY)
(a) Turn the ignition switch to OFF.
(b) Connect an intelligent tester or Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the intelligent tester or Techstream on.
(e) Enter the following menus:
(1) Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / CHASSIS / EMPS / DATA LIST /
(2) Techstream - Select: Chassis / EMPS / Data List /
(f) Select the item "IG Power Supply" in the Data List and read the value displayed on the intelligent tester or Techstream.
(1) Intelligent tester

EMPS:

(2) Techstream

EMPS:

OK:
The normal condition value is displayed on the intelligent tester or Techstream.
NG -- INSPECT FUSE (ECU-IG NO. 1)
OK -- CHECK INTERMITTENT PROBLEMS
2. INSPECT FUSE (ECU-IG NO. 1)
(a) Remove the ECU-IG No. 1 fuse from the main body ECU.
(b) Measure the resistance of the fuse.
Standard resistance:

NG -- REPLACE FUSE
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (BATTERY - POWER STEERING ECU)

(a) Disconnect the connectors from the power steering ECU.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE POWER STEERING ECU