Power Steering
DTC C1523
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.
DTC Descriptor
DTC C1523 03
- System Voltage Low Voltage
DTC C1523 07
- System Voltage High Voltage
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit/System Description
The power steering control module (PSCM) monitors the system voltage to ensure that the voltage stays within proper range. Damage to components and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
* Engine Running
* Power steering system voltage is 9-16 volts.
Conditions for Setting the DTC
DTC C1523 03
The input voltage at the power steering control unit Connector X1, terminal 1 is less than 9 volts for at least 0.3 seconds.
DTC C1523 07
The input voltage at the power steering control unit Connector X1, terminal 1 is greater than 16 volts for at least 0.1 second.
Action Taken When the DTC Sets
Steering boost is decreased.
Conditions for Clearing the DTC
A history DTC will clear after 60 consecutive malfunction-free ignition cycles.
Diagnostic Aids
* Overheating of the system caused by overload.
* After many steering movements the steering is overheated (for example, parking several times at high outside temperature).
Reference Information
Schematic Reference
Power Steering Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Power Steering System Description and Operation (TRW) (Power Steering System Description and Operation (TRW))Power Steering System Description and Operation (ZF) (Power Steering System Description and Operation (ZF))
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Circuit/System Verification
1. Engine running, accessories OFF, measure and record the battery voltage. The voltage should be between 9.0 and 16.0 volts.
• If not within the specified range, refer to Charging System Test (Charging System Test) .
2. Observe the scan tool Electro-hydraulic power steering ECU Battery Voltage. The reading should be between 9.0 and 16.0 volts.
Circuit/System Testing
1. Ignition OFF, disconnect the B+ harness connector at the power steering module.
2. Test for less than 5.0 Ohm between the ground circuit terminal listed below and ground.
• Connector X2, terminal 2
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Verify that the test lamp illuminates between the B+ circuit terminals listed below and ground.
* Terminal Connector X2, terminal 40
* Terminal Connector X3, terminal 1
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, replace the power steering module.
Repair Instructions
Important: For any module replacement a set procedure needs to be followed. A "Reset" may need to be performed from the PROGRAMMING menu of the current system with the scan tool BEFORE replacing the module.
* Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* Power Steering Pump Replacement (TRW) (Service and Repair)Power Steering Pump Replacement (ZF) (Service and Repair)
* Power Steering Pump Wiring Harness Replacement (Service and Repair)