12. Exhaust Restriction Test

12. EXHAUST RESTRICTION TEST

Purpose:
The purpose of this test is to determine if an exhaust system restriction is causing a performance problem.

Exhaust Restriction







- Visually inspect the exhaust system for damage.
- Monitor the EBP PID with the scan tool and the engine temperature greater than 70°C (158°F) at 3,800 RPM with the vehicle in PARK/NEUTRAL.

Recommended Procedure:
Connect the scan tool. Access and monitor the EBP and RPM PIDS.
- Increase the engine speed to 3,800 RPM.
- Record the EBP PID value.
- A low RPM or an EBP PID value greater than 244 kPa (35 psi) indicates a restricted exhaust condition.

Possible Causes:
- Collapsed or restricted tail pipe
- Restricted oxidation catalytic converter (OC)
- Restricted diesel particulate filter
- Damaged muffler
- Turbocharger

Tools Required:
Scan tool