GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2001 🢒 Isuzu T-Series (Truck Line C) 🢒 Brakes 🢒 Park Brake 🢒 Diagnostic System Check - Park Brake

Circuit Description

The Park Brake Diagnostic System Check is an organized approach to identifying problems associated with the electro/hydraulic park brake (EHPB). This must be the starting point for any EHPB related concern and will direct you to the next logical step in diagnosing a malfunction. Most system malfunctions are linked to faulty wiring, connections, and occasionally to components. Understanding the EHPB system and using the diagnostic tables correctly will reduce diagnostic time and prevent unnecessary parts replacement.

Test Description

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

  1. Some codes may set in adverse conditions even though the park brake system is functioning properly. This information can be found in the Diagnostic Aids section for the corresponding code.

Step

Action

Yes

No

1
  1. Turn ON the ignition.
  2. Display and record any DTCs that are stored in the park brake control module (PBCM). Refer to Diagnostic Trouble Code (DTC) Displaying .

Did you find any DTCs present?

Go to Step 2

Go to Symptoms - Park Brake

2
  1. Clear the DTCs. Refer to Diagnostic Trouble Code (DTC) Clearing .
  2. Operate the park brake.

Did any DTCs reset?

Go to Diagnostic Trouble Code (DTC) List

Go to Step 3

3

Review the appropriate Diagnostic Aids for the original DTCs that were set.

Does the park brake function properly?

System OK

Go to Symptoms - Park Brake