POWER STEERING SYSTEM, Diagnostic DTC:C1551

DESCRIPTION

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

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

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

   
   

   1. Turn the ignition switch off.

   2. Connect the intelligent tester to the DLC3.

   3. Turn the ignition switch on (IG).

   4. Turn the intelligent tester on.

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

   6. 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	11 to 14 V	Ignition switch on (IG)

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

   
   

   NG

   INSPECT FUSE (ECU IG NO. 1) Click here

   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.

   2. Measure the resistance of the fuse.

      OK
      Below 1 Ω

   
   

   NG

   REPLACE FUSE

   OK

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

   
   

   1. 

      Disconnect the connectors from the power steering ECU.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition D5-5 (IG) - Body ground Ignition switch on (IG) 11 to 14 V

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

      Standard resistance
      Tester Connection Condition Specified Condition D4-2 (PGND) - Body ground Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE POWER STEERING ECU Click here