Durango 2WD V6-3.7L (2009)
1. With ignition key off, and door open, press on the brake pedal. The electric vacuum pump (EVP) should come on for approximately 2-5 seconds.
If not, EVP or circuits may be faulty, refer to DTC diagnostics.
2. Start engine and check booster vacuum hose connections. A hissing noise indicates vacuum leak. Correct any vacuum leak before proceeding.
3. Turn off engine.
4. Remove the Vacuum Pump Circuit Breaker located in the Power Distribution Center-HEV.
5. Disconnect the harness connector of the Brake Pedal Simulator Cut Off (3).
6. Pump brake pedal until all vacuum reserve in booster is depleted.
7. Press and hold brake pedal under light foot pressure. The pedal should hold firm, if the pedal falls away master cylinder is faulty (internal
leakage).
NOTE: Several system warning lamps will illuminate on the instrument panel after starting the engine due to the circuit breaker and harness
connector disconnect in the previous steps. The last step will clear DTCs and reset these warning lamps.
8. Start engine and note pedal action. It should fall away slightly under light foot pressure then hold firm. If no pedal action is discernible and the
Power Booster Vacuum Test - HEV and Power Booster Check Valve Test - HEV have both passed, the power booster is faulty.
9. Increase engine speed to 1500 rpm, close the throttle and immediately turn off ignition to stop engine. Wait a minimum of 90 seconds and try
brake action again. Booster should provide two or more vacuum assisted pedal applications. If vacuum assist is not provided, booster is faulty.
10. Stop engine, connect the harness connector of the Brake Pedal Simulator Cut Off (3) and install the Vacuum Pump Circuit Breaker.
NOTE: This step must be performed. The warning lamps may not be illuminated after reconnecting all connectors, however the DTCs will
need to be cleared
11. Perform the ABS VERIFICATION TEST-HEV See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic
Trouble Code Tests and Associated Procedures/Verification Tests/ABS Verification Test.
