Leak Test Fails

If the pressure gage reads less than 158 kPa (23 psi) with constant air pressure, and audible air leaks are present, the leak test has failed. Perform the following procedure:

1. Inspect for air leaks by listening for excessive hissing sounds.
2. Inspect for air leaks by using a pump spray bottle to apply a soapy solution, while observing for excessive soapy bubbles at all of the following engine locations:
   • Charge air cooler pipes/hoses connections
   • Charge air cooler core
   • EGR valve gaskets
   • EGR valve cooler gaskets
   • Exhaust manifold gaskets
   • Turbocharger gaskets, inlet and outlet connections
   • Intake manifold gaskets
3. Replace the affected gasket or component, as necessary.
4. Retest the engine system. If no other leaks are found, assemble the vehicle and clear the DTC information with a scan tool.