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Home >> GMC >> 2003 >> Jimmy 2D Utility, Part Time, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 137 (Antilock Brake System, Traction Control System & Stability Control System) >> Diagnostic Information and Procedures >> DTC C1242 or C1243 >> Test Description
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 3:  Tests the ability of the EBCM to control the pump motor. If the test lamp illuminates, the pump motor circuit within the EBCM is good.
DTC C1242 or C1243

Step Action Yes No
Schematic Reference:  ABS Schematics  
Connector End View Reference:  ABS Connector End Views  
1 Did you perform the ABS Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - ABS 
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. With the scan tool, perform the Automated Test.
Does the DTC reset?		 Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 
  1. Turn OFF the ignition.
  2. Disconnect the pump motor harness pigtail connector of the BPMV.
  3. Connect a test lamp between the pump motor circuits at the pump motor connector of the EBCM using the J 35616  connector test adapter kit.
  4. Use the scan tool in order to clear the DTCs.
  5. With the scan tool, perform the Pump Motor Test.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 5 
4 Inspect for poor connections at the pump motor harness pigtail connector of the BPMV. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 8  Go to Step 6 
5 Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 8  Go to Step 7 
6 Replace the BPMV. Refer to Brake Pressure Modulator Valve (BPMV) Replacement .
Did you complete the repair?		 Go to Step 8  -
7 Replace the EBCM. Refer to Electronic Brake Control Module Replacement .
Did you complete the repair?		 Go to Step 8  -
8
  1. Use the scan tool in order to clear the DTCs.
  2. With the scan tool, perform the Automated Test.
Does the DTC reset?		 Go to Step 2  System OK
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