C1551

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1551/25: IG Power Supply Voltage Malfunction
C1551/25 - IG Power Supply Voltage Malfunction

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If the power steering ECU assembly has been replaced, perform assist map writing Programming and Relearning.

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

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION AND GROUND WIRE

(a) Check the connection condition of the ECU wire sub-assembly and power steering ECU assembly connectors.

OK:

The ECU wire sub-assembly and power steering ECU assembly connectors are securely connected.

(b) Check that the ground wire is securely installed with the bolt Installation.

OK:

The ground wire is securely installed with the bolt.

NG -- CONNECT CONNECTOR OR INSTALL GROUND WIRE Installation
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (IG POWER SUPPLY)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / EMPS / Data List.

(f) Select the item "IG power supply" in the Data List and read the value displayed on the Techstream.

EMPS





OK:

The normal condition value is displayed on the Techstream.

NG -- CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - ECU WIRE SUB-ASSEMBLY)

OK -- CHECK INTERMITTENT PROBLEMS How To Proceed With Troubleshooting

3. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - ECU WIRE SUB-ASSEMBLY)

(a) Disconnect the Ij2 connector from the ECU wire sub-assembly.





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

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK ECU WIRE SUB-ASSEMBLY

(a) Connect the Ij2 connector to the ECU wire sub-assembly.





(b) Disconnect the power steering ECU assembly j3 and j2 connectors.

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

Standard Voltage:





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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE ECU WIRE SUB-ASSEMBLY Disassembly

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal