Circuit Description
When Stabilitrak® or TCS activates for longer than 1.5 seconds, there will be an accompanying DIC message. Short activations of either system may occur without any DIC messages. Stabilitrak® activations mostly occur in the turns or bumpy roads without much use of the accelerator pedal. Activations may also occur during aggressive driving. Unwanted Stabilitrak® activations may be caused by the following:
| • | A loosely mounted yaw rate sensor |
| • | An intermittent faulty steering wheel position sensor |
| • | An intermittent wiring harness problem |
| • | A chassis alignment that is grossly out of specification |
| • | The wrong EBTCM installed |
| • | The wrong steering gear rack installed |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check |
2 | Check the mounting of the yaw rate sensor. Is the yaw rate sensor properly secured? | -- | Go to Step 4 | Go to Step 3 |
3 | Remount or properly secure the yaw rate sensor. Refer to Vehicle Yaw Sensor Replacement . Did you complete the repair? | -- | Go to Diagnostic System Check | -- |
4 |
Does the yaw rate sensor output suddenly increase or decrease without rapid turning of the vehicle? | -- | Go to Step 5 | |
5 |
Did Phase A and Phase B change states as the steering wheel was rotated? | -- | Go to Step 6 | Go to Step 8 |
6 |
Did Phase A and Phase B change states as the steering wheel was rotated? | -- | Go to Step 7 | Go to Step 8 |
7 | Perform the Steering Position Sensor Test. Refer to Scan Tool Diagnostics . Was the Steering Position Sensor Test passed? | -- | Go to Step 9 | Go to Step 8 |
8 | Replace the Steering Wheel Position Sensor. Refer to Lower Steering Shaft, Lower Bearing, Column Jacket - Off Vehicle in Steering Wheel and Column - Tilt. Did you complete the repair? | -- | Go to Diagnostic System Check | -- |
9 |
Is the Lateral Accelerometer Input voltage within the specified range? | 2.3-2.7 V | Go to Step 14 | Go to Step 10 |
10 | Check the mounting of the lateral accelerometer sensor. Is the lateral accelerometer sensor properly secured? | -- | Go to Step 12 | Go to Step 11 |
11 | Remount or properly secure the lateral accelerometer. Refer to Lateral Accelerometer Replacement . Did you complete the repair? | -- | Go to Step 12 | -- |
12 | Using the scan tool, display the Lateral Accelerometer Input in the ABS/TCS/ICCS Data Display (1) Diagnostics, DATA LIST 2. Is the Lateral Accelerometer Input voltage within the specified range? | 2.3-2.7 V | Go to Step 14 | Go to Step 13 |
13 | Replace the lateral accelerometer sensor. Refer to Lateral Accelerometer Replacement . Did you complete the repair? | -- | Go to Diagnostic System Check | -- |
14 | Check the EBTCM for the proper part number. Is the EBTCM part number correct? | -- | Go to Step 15 | Go to Step 17 |
15 | Check the power steering gear for the proper part number. Is the power steering gear part number correct? | -- | Go to Step 16 | Go to Step 18 |
16 |
Is the vehicle alignment proper? | -- | Go to Diagnostic System Check | |
17 | Replace the EBTCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair? | -- | Go to Diagnostic System Check | -- |
18 | Replace the power steering gear. Refer to Steering Gear Replacement in Power Steering System. Did you complete the repair? | -- | Go to Diagnostic System Check | -- |
