C1552

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1552/22, C1554/23: PIG Power Supply Voltage Malfunction
C1554/23 - Power Supply Relay Failure

DESCRIPTION

When a problem occurs in the power steering system, the power source relay circuit is shut off to stop the power assist.





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 (PIG 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 "PIG 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 Ij1 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 Ij1connector to the ECU wire sub-assembly.





(b) Disconnect the power steering ECU assembly j2 connector.

(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