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Tahoe / Yukon Service Manual

DTC C1119

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptor DTC C1119 49 Torque Input Sensor Signal Malfunction. Circuit/System Description The power steering control module continuously monitors the digital torque sensor’s torque. As the steering wheel is turned and torsional twist is applied to the steering shaft, the steering input and output shafts are monitored via the torque signal circuit and then processed by the power steering control module to calculate the steering torque. The power steering system contains two torque sensors for redundancy in order to limit situations where total loss of assist occur. If a malfunction occurs in only one of the two torque sensors, the power steering system will continue to provide steering assist. Conditions for Running the DTC Ignition ON, Engine Running. Power steering system voltage is 6–16 V. Conditions for Setting the DTC The power steering control module detects a short to ground, short to voltage, or an open/high resistance on any of the torque sensor circuits. Action Taken When the DTC Sets DTC C1119 is stored in memory. Assist reduced to 50%. Conditions for Clearing the DTC A history DTC will clear after 40 consecutive malfunction-free ignition cycles. Reference Information Schematic Reference Power Steering Schematics Connector End View Reference Master Electrical Component List Description and Operation Power Steering System Description and Operation Electrical Information Reference Ci it T ti Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information. Circuit/System Verification

  1. Verify that all harness connectors are installed properly at the K43 Power Steering Control Module. ⇒ If a harness connector at the K43 Power Steering Control Module is not installed properly 1.1. Connect the appropriate harness connector properly at the K43 Power Steering Control Module. 1.2. Verify the DTC does not set. ⇒ If the DTC sets, replace the Steering Gear. ⇓ If the DTC does not set 1.3. All OK. ⇓ If all harness connectors at the K43 Power Steering Control Module are installed properly
  2. Ignition ON.
  3. Verify the scan tool Torque Sensor parameter changes when turning the steering wheel. ⇒ If the parameter does not change Replace the Steering Gear. ⇓ If the parameter changes
  4. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Electric Dual Pinion Rack and Pinion Steering Gear Replacement Control Module References for control module replacement, programming and setup.