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HOMESERVICE MANUALSSATURN2005RELAY AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTILOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C0870TEST DESCRIPTION
2005 Saturn Relay AWD

Test Description

2005 Saturn Relay AWDSECTION Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step tests for a short to ground or voltage on the 5-volt reference circuit.
  2. 3:  This step tests for an internal short to ground in the yaw rate and lateral accelerometer sensor.
  3. 4:  This step tests for an internal short to ground in the SWPS.
DTC C0870

Step Action Yes No
Schematic Reference: ABS Schematics 
Connector End View Reference: ABS Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2  Check for a short to ground or voltage on the 5-volt reference circuit of the following sensors:
  • The yaw rate and lateral acceleration sensor
  • The steering wheel position sensor (SWPS)

Did you find and correct the condition?		 Go to Step 8  Go to Step 3 
3 
  1. Clear the DTCs with the scan tool.
  2. Turn OFF the ignition.
  3. Disconnect the yaw rate and lateral acceleration sensor.
  4. Turn ON the ignition.
Does DTC C0870 set?		 Go to Step 4  Go to Step 5 
4 
  1. Reconnect the yaw rate and lateral acceleration sensor.
  2. Clear the DTCs with the scan tool.
  3. Turn OFF the ignition.
  4. Disconnect the SWPS.
  5. Turn ON the ignition.
Does DTC C0870 set?		 Go to Step 7  Go to Step 6 
5 Replace the yaw rate and lateral acceleration sensor. Refer to Yaw Rate Sensor/Lateral Accelerometer Replacement .
Did you complete the replacement?		 Go to Step 8  -
6 Replace the SWPS. Refer to Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement .
Did you complete the replacement?		 Go to Step 8  -
7 Replace the electronic brake control module (EBCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 8  -
8
  1. Clear the DTCs using the scan tool.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.