Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2: The lack of communication may be caused by a partial or a total malfunction of the circuit containing the class 2 serial data. The specified procedure will determine the particular condition.
- 3: The presence of DTCs which begin with a U indicate some other module is not communicating. The specified procedure will collect all the available information before tests are performed.
- 5: Tests if a malfunction exists in the EPS system.
- 6: Tests if the steering column shaft is bent, twisted or damaged due to a previous collision and or air bag deployment.
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| 1 | Install a scan tool. Does the scan tool turn on? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications | |
| 2 | Turn ON the ignition, with the engine OFF. Attempt to establish communication with the Power Steering Control Module (PSCM). Does the scan tool communicate with the PSCM? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |
| 3 | Select the Diagnostic Trouble Codes (DTC) function on the scan tool. Does the scan tool display any DTCs that begin with a U? | Go to Diagnostic Trouble Code (DTC) List in Data Link Communications | Go to Step 4 | |
| 4 | Does the scan tool display DTC C0550? | Go to Diagnostic Trouble Code (DTC) List in Body Control Systems | Go to Step 5 | |
| 5 | Does the scan tool display any EPS DTCs? | Go to Diagnostic Trouble Code (DTC) List | Go to Step 6 | |
| 6 | Start the engine. Turn the steering wheel 90° to the left, then 90° to the right, then return the steering wheel to center. remove hands from steering wheel and ensure no force is being applied to the steering wheel. Using the scan tool observe the Torque Sensor Main data parameter in the EPS data list. Does the scan tool indicate that the Torque Sensor Main data parameter is less than the specified range? | < + or - 1 N.m(0.7 lb ft) | Go to Symptoms - Power Steering System | Go to Steering Column Replacement in Steering Wheel and Column |
Diagnostic System Check - Power Steering System
- 2: Tests for the presence of vehicle speed related DTCs in the control module where the vehicle speed message originates.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Power Steering System Schematics Connector End View Reference: Power Steering System Connector End Views | |||
| 1 | Did you perform the Power Steering System Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Power Steering System |
| 2 | Install a scan tool. Turn ON the ignition, with the engine OFF. With the scan tool, select the Transmission Diagnostic Trouble Codes (DTC) function in Powertrain. Does the scan tool indicate the presents of any vehicle related DTCs? | Go to Diagnostic System Check - Automatic Transmission in Automatic Transmission - 5AT, or to Diagnostic System Check - Automatic Transmission in Automatic Transmission VT25-E, or to Diagnostic System Check - Manual Transmission in Manual Transmission - Getrage 5 Speed | Go to Step 3 |
| 3 | Use the scan tool in order to clear the EPS DTCs. Operate the vehicle within the conditions for running the DTC. Does the DTC reset? | Go to Step 2 | System OK |
DTC C0000
Scheme 2
The number below refer to the step number on the diagnostic table.
- 2: Tests if the high system temperature is system, or driving condition related.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Power Steering System Schematics Connector End View Reference: Power Steering System Connector End Views | |||
| 1 | Did you perform the Power Steering Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Power Steering System |
| 2 | Since most occurrences of the DTC are caused by frequent static steering, such as parking maneuvers and high ambient temperatures, review the EPS system with the customer to determine the conditions under which the DTC set. Did steering conditions, or high ambient temperatures cause the DTC to set? | Go to Step 3 | Go to Diagnostic Aids |
| 3 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset? | Go to Step 2 | System OK |
DTC C0476
The number below refers to the step number on the diagnostic table.
- 2: Tests the torque sensor in its active state.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Power Steering System Schematics Connector End View Reference: Power Steering System Connector End Views | ||||
| 1 | Did you perform the Power Steering Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Power Steering System | |
| 2 | Install a scan tool Start the engine. With the scan tool, observe the Torque Sensor Main data parameter in the EPS Data List 2. Turn the steering wheel 90 degrees to the right and hold the steering wheel position. Does the scan tool indicate that the Torque Sensor Main data parameter changes state wile turning the steering wheel and is less than the specified value? | 17.2 N.m(12.6 lb ft) | Go to Diagnostic Aids | Go to Step 3 |
| 3 | Replace the EPS assembly. Refer to Steering Column Replacement in Steering Wheel and Column. Did you complete the repair? | Go to Step 4 | ||
| 4 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset? | Go to Step 2 | System OK | |
DTC C0545
The numbers below refer to the step numbers on the diagnostic table.
- 2: Tests if the condition is current.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Did you perform the Diagnostic System Check - Power Steering System? | Go to Step 2 | Go to Diagnostic System Check - Power Steering System |
| 2 | Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the Tuning Profile parameter in the EPS data list. Does the scan tool display number 0? | Go to Step 3 | Go to Step 4 |
| 3 | Configure the PSCM. Refer to Service Programming System (SPS) in Vehicle Control Systems. Did you complete the repair? | Go to Step 4 | |
| 4 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset? | Go to Step 2 | System OK |
DTC C0551
Scheme 3
The numbers below refer to the step numbers on the diagnostic table.
- 2: Tests if the malfunction is intermittent.
- 5: Tests if a short to ground exists in the ignition 1 voltage circuit, or in the PSCM.
| Step | Action | Yes | No |
|---|---|---|---|
| Connector End Views Reference: Power Steering System Connector End Views | |||
| 1 | Did you perform the Power Steering Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Power Steering System |
| 2 | Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, attempt to establish communication with the PSCM. Does the scan tool communicate with the PSCM? | Go to Diagnostic Aids | Go to Step 3 |
| 3 | Turn OFF the ignition. Inspect the 10 A EPS fuse for an open. Is the fuse open? | Go to Step 4 | Go to Step 6 |
| 4 | Replace the 10 A EPS fuse. Turn ON the ignition, with the engine OFF. Does the fuse open? | Go to Step 5 | Go to Diagnostic Aids |
| 5 | Test the ignition 1 voltage circuit of the PSCM for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
| 6 | Test the ignition 1 voltage circuit of the PSCM for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 7 |
| 7 | Inspect for poor connections at the harness connector of the IPFB. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
| 8 | Inspect for poor connections at the harness connector of the PSCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
| 9 | Replace the EPS assembly. Refer to Steering Column Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 10 | |
| 10 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset? | Go to Step 2 | System OK |
DTC C0847
Scheme 4
The number below refers to the step number on the diagnostic table.
- 2: Tests if the malfunction exists in the vehicles charging system.
- 3: Tests if the malfunction is intermittent.
| Step | Action | Yes | No |
|---|---|---|---|
| Connector End Views Reference: Power Steering System Connector End Views | |||
| 1 | Did you perform the Power Steering Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Power Steering System |
| 2 | Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the Battery Voltage parameter in the ECM/PCM Data List. Does the scan tool display greater than 11 volts? | Go to Step 3 | Go to Diagnostic System Check - Engine Electrical in Engine Electrical |
| 3 | With a scan tool, observe the Battery Voltage parameter in the EPS Data List. Does the scan tool display greater than 11 volts? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 4 |
| 4 | Test the battery positive voltage circuit of the PSCM for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 5 |
| 5 | Test the ground circuit of the PSCM for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
| 6 | Inspect for poor connections at the harness connector of the underhood fuse block stud terminal. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 7 |
| 7 | Inspect for poor connections at the harness connector of the PSCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
| 8 | Inspect for poor connections at the ground terminal G109. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
| 9 | Replace the EPS assembly. Refer to Steering Column Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 10 | |
| 10 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset? | Go to Step 2 | System OK |
DTC C0896
Scheme 5
The numbers below refer to the step numbers on the diagnostic table.
- 2: Tests if the malfunction exists in the vehicles charging system.
- 3: Tests if the malfunction is in the EPS system.
| Step | Action | Yes | No |
|---|---|---|---|
| Connector End Views Reference: Power Steering System Connector End Views | |||
| 1 | Did you perform the Power Steering Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Power Steering System |
| 2 | Install a scan tool. Turn ON the ignition, with the engine OFF. Turn ON the scan tool Does the scan tool power up and communicate with the Engine Control Module (ECM)? | Go to Step 3 | Go to Diagnostic System Check - Engine Electrical in Engine Electrical |
| 3 | With the scan tool observe the Battery Voltage parameter in the EPS Data List. Does the scan tool display less than 8 Volts? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
| 4 | Test the battery positive voltage circuit of the PSCM for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 5 |
| 5 | Test the ground circuit of the PSCM for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
| 6 | Inspect for poor connections at the harness connector of the PSCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 7 |
| 7 | Inspect for poor connections at the harness connector of the underhood fuse block stud terminal. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
| 8 | Inspect for poor connections at the ground connector, G207. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
| 9 | Replace the EPS assembly. Refer to Steering Column Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 10 | |
| 10 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset? | Go to Step 2 | System OK |
DTC C0899
