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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 772 (Anti-Lock Brake System) >> Diagnostic Information & Procedures >> DTC C0269: Excessive Dump/Isolation Time; C0274: Excessive Dump/Isolation Time >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. 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. )  -Performing solenoid tests determines if there is a mechanical malfunction inside the BPMV. Perform dump valve solenoid tests for DTC C0269 or isolation valve solenoid tests for DTC C0274.
DTC C0269 Or C0274 Diagnosis

Step Action Yes No
1 Did you perform the ABS Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - ABS 
1
  1. 1) Use a scan tool in order to clear the DTCs.
  2. 2) Use the scan tool in order to perform the necessary Solenoid Tests. Refer to Scan Tool Output Controls .
Do the Solenoid Tests show the system to be functioning normally?		 Go to Diagnostic Aids Go to Step 3 
3 Replace the BPMV. Refer to Brake Pressure Modulator Valve (BPMV) Replacement . Did you complete the replacement? Go to Step 4  -
4 Use the scan tool in order to perform the necessary Solenoid Tests. Do the Solenoid Tests show the system to be functioning normally? System OK Go to Step 3 
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