Test Description
WARNING: This page is about a different car, the 2004 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.
- 2: This step uses the scan tool to test the ignition positive voltage circuit to the EBCM.
DTC C1279
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: ABS Schematics Connector End View Reference: ABS Connector End Views |
||||
| 1 | Did you perform A Diagnostic System Check - ABS? | - | Go to Step 2 | Go to Diagnostic System Check - ABS |
| 2 |
|
Low | Go to Diagnostic Aids | Go to Step 3 |
| 3 | Test the deceleration sensor circuits of the EBCM for a high resistance, an open, or a short. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 7 | Go to Step 4 |
| 4 | Test the voltage of the deceleration sensor circuits of the EBCM to a good ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Is the voltage within the specified range? |
Terminal GS1 and GS2: approximately 5 V Terminal GST: switching 0 to 12 V |
Go to Step 5 | Go to Step 6 |
| 5 | Replace the deceleration sensor. Refer to Deceleration Sensor Replacement . Did you complete the replacement? |
- | Go to Step 7 | - |
| 6 | Replace the brake pressure modulator valve (BPMV). Refer to Brake Modulator Assembly Replacement . Did you complete the replacement? |
- | Go to Step 7 | - |
| 7 |
|
- | Go to Step 2 | System OK |