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Home >> Pontiac >> 2004 >> Vibe Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 121 (Antilock Brake System, Traction Control System & Stability Control System) >> Diagnostic Information and Procedures >> DTC C0273 >> Test Description
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Test Description

WARNING: This page is about a different car, the 2005 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  This step determines if the DTC is current.
  2. 6:  This step tests the relay circuits between the ABS relay block and the EBCM for an open, high resistance, or short to ground.
  3. 7:  This step tests the battery positive voltage circuit for an open, high resistance, or short to ground.
  4. 8:  This step tests the motor ground circuit for an open or high resistance.
DTC C0273

Step Action Values 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 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Use the scan tool in order to clear the DTCs.
  4. Using the scan tool, cycle the pump motor in the Special Functions menu.
  5. Read the DTCs.
Does the DTC reset?		 - Go to Step 3  Go to Diagnostic Aids
3 Is the vehicle equipped with the traction control system? - Go to Step 4  Go to Step 5 
4
  1. Turn OFF the ignition.
  2. Remove the ABS motor relay.
  3. Turn ON the ignition.
  4. Measure the voltage between the battery positive voltage terminal of the ABS motor relay and a good ground.
Does the voltage measure as specified?		 10-14 V Go to Step 6  Go to Step 7 
5
  1. Turn OFF the ignition.
  2. Disconnect the electronic brake control module (EBCM) harness connector.
  3. Measure the voltage between the battery positive voltage circuits of the EBCM and a good ground.
Does the voltage measure as specified?		 10-14 V Go to Step 8  Go to Step 9 
6  Test the relay circuits between the ABS relay block and the EBCM for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 11 
7  Test the battery positive voltage circuit for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  Go to Step 12 
8  Measure the resistance between the EBCM ground circuits and a good ground.
Does the resistance measure as specified?		 Below 1 Ω Go to Step 13  Go to Step 10 
9 Locate and repair the open, high resistance, or short to ground in the battery positive voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  -
10 Locate and repair the open or high resistance in the motor ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 14  -
11 Replace the ABS motor relay.
Did you complete the replacement?		 - Go to Step 14  -
12 Replace the ABS cutoff relay.
Did you complete the replacement?		 - Go to Step 14  -
13 Replace the brake pressure modulator valve (BPMV). Refer to Brake Modulator Assembly Replacement (Without VSC)  or Brake Modulator Assembly Replacement (With VSC) .
Did you complete the replacement?		 - Go to Step 14  -
14
  1. Use the scan tool in order to clear the DTCs.
  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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