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Tahoe / Yukon Service Manual

DTC C115E or C1170

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC C115E Transfer Case Motor Clockwise Control DTC C1170 Transfer Case Range Actuator System Performance Symptom Byte Information: Symptom Byte List. Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Control Circuit — Terminal A @ A16 Transfer Case Four Wheel Drive Actuator C115E 11 C115E 13 C115E 12 C1170 98, 64
Control Circuit — Terminal D @ A16 Transfer Case Four Wheel Drive Actuator C115E 11 C115E 13 C115E 12 C1170 98, 64

Circuit/System Description For an overview of the component/system, refer to: Transfer Case Description and Operation

Circuit Description
Control Circuit — Terminal A @ A16 Transfer Case Four Wheel Drive Actuator The output circuit is switched from ground to 12 V to activate the component.
Control Circuit — Terminal D @ A16 Transfer Case Four Wheel Drive Actuator The output circuit is switched from ground to 12 V to activate the component.
Component Description
A16 Transfer Case Four Wheel Drive Actuator An electric DC motor.
Component Description
The motor is bidirectional.
K69 Transfer Case Control Module The control module contains a microprocessor used to process input data to control outputs.

Conditions for Running the DTC Ignition = On System Voltage = 9 to 17.5 V Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC C115E 12 Control Circuit = Short to Voltage C115E 11 Voltage = 0 to 0.107 V C115E 13 Condition 1 Voltage = 0.85 to 1.057 V Condition 2 Voltage = 0 to 0.107 V C119E 64 Not plausible conditions, greater than 5 degrees C119E 98 Control module K69 detects: High Temperature Actuator temperature stress has exceeded the maximum stress. Actions Taken When the DTC Sets Shifting = Disabled Driver Information Display = Service 4WD Conditions for Clearing the DTC The conditions for setting the DTC no longer exist. A history DTC will clear after 40 consecutive malfunction-free ignition cycles. Reference Information Schematic Reference Transfer Case Control Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify DTC C115E, C1170 is not set. ⇒ If the DTC is set Refer to: Circuit/System Testing ⇓ If the DTC is not set
  3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC is not set
  4. All OK. Circuit/System Testing
  5. Ignition/Vehicle » Off
  6. Disconnect the electrical connector: A16 Transfer Case Four Wheel Drive Actuator
  7. Connect a test lamp between the test points: Control circuit terminal A & Control circuit terminal D
  8. Start the vehicle and place the transmission in Neutral.
  9. Perform the scan tool control function: Range Actuator Verify the test lamp state: Range Actuator » Idle = Test lamp Off Range Actuator » Clockwise = Test lamp On Range Actuator » Counterclockwise = Test lamp On ⇒ If not the specified state 5.1. Ignition/Vehicle » Off & Remove » Test lamp 5.2. Disconnect the electrical connector: X1 @ K69 Transfer Case Control Module 5.3. Use jumper wires to connect the CAN Bus serial data circuits together at the K69 Transfer Case Control Module connector. Jumper circuit 4979 to 4979. Jumper circuit 4978 to

5.4. Ignition » On / Vehicle » In Service Mode 5.5. Test for less than 1 V between the test points: Control circuit terminal A @ Component harness & Ground Control circuit terminal D @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V 5.6. Ignition/Vehicle » Off 5.7. Test for infinite resistance between the test points: Control circuit terminal A @ Component harness & Ground Control circuit terminal D @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 5.8. Test for less than 2 Ω between the test points: Control circuit terminal A @ Component harness & Terminal 38 @ Control module harness Control circuit terminal D @ Component harness & Terminal 13 @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K69 Transfer Case Control Module ⇓ If the specified state 6. Test or replace the component: A16 Transfer Case Four Wheel Drive Actuator Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Transfer Case Two/Four Wheel Drive Actuator Replacement — A16 Transfer Case Four Wheel Drive Actuator For control module replacement, programming, and setup refer to: Control Module References