Engine Electrical
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 Descriptors
DTC C1523 03
- System Voltage Low Voltage
DTC C1523 07
- System Voltage High Voltage
Diagnostic Fault Information
Circuit/System Description
The power steering control module (PSCM) monitors the battery voltage through the battery voltage signal circuit. If the PSCM senses that battery voltage is outside of its normal range, DTC C1523 will set. Damage to components, and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
* The voltage supplied to the control module is in the range of 7-26 volts.
* The ignition is ON.
* The engine is running.
Conditions for Setting the DTC
C1523 03
The PSCM detects a system voltage below the calibrated value usually 9 volts for 5 seconds.
C1523 07
The PSCM detects a system voltage above the calibrated value usually 18 volts for 5 seconds.
Action Taken When the DTC Sets
* The PSCM commands the SERVICE POWER STEERING message in the DIC to be displayed ON
* The PSCM system is disabled.
Conditions for Clearing the DTC
The DTC clears when the system voltage returns to a normal range.
Diagnostic Aids
* A high or low voltage DTC set in multiple control modules indicates a concern in the charging system.
* A possible cause of this DTC could be overcharging with a battery charger or jump starting.
* A high or low voltage value in multiple control modules indicates a concern in the charging system.
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))
Charging System Description and Operation (Description and Operation)
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 measure and record the voltage at the battery terminals.
2. Verify that the battery voltage is 12.6-15.5 volts
• If the battery voltage is not within the specified range, refer to Charging System Test (Charging System Test)
3. Engine running, observe the scan tool EHPS Positive Voltage parameter.
4. Verify that the scan tool displays a value that is within 2 volts of the battery terminal voltage.
Circuit/System Testing
1. Ignition OFF, Disconnect the harness connectors at the PSCM .
2. Ignition OFF, verify that there is less than 3.0 ohms between the ground circuit X2 terminal 2 and ground.
• If greater than the specified value, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the battery positive voltage circuit X2 terminal 1 and ground.
• If test lamp did not illuminate, test the battery positive voltage circuit for a short to ground or an open/high resistance.
4. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit X1 terminal 1 and ground.
• If test lamp did not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance.
5. If all the circuits test normal, replace the PSCM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for PSCM replacement, setup, and programming.