Purpose
To check for restrictions in the exhaust system likely to cause engine performance problems
NOTE: High intake or exhaust restriction can cause a large amount of black smoke.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
Monitoring EBP using EST
NOTE: If an EST is not available, use alternate method – “Monitoring EBP using Pressure Sensor.”
1. See “DT 466 Performance Specifications” – Appendix A (page 595) or “DT 570 and HT 570
Performance Specifications” – Appendix B (page 619) for specifications and record on Diagnostic Form.
2. Inspect the exhaust system for damage and restriction.
3. Disconnect the EGR control valve. If EGR control valve is plugged in during the test, results will be incorrect.
NOTE: When the EGR control valve is disconnected, the ECM will set DTC 163 (Position signal out of range low ) and possibly DTC 365 (Position above/below desired level) for the EGR control valve. Ignore and clear DTC 163 and DTC 365, after the test is complete.
4. Open D_KOER_AirManagement.ssn to monitor EBP at high idle, no load.
5. Run engine at high idle, no load.
NOTE: Do not run KOER Air Management test.
The session is open to monitor EBP at high idle and to clear DTC after it is set.
6. Record results on Diagnostic Form.
• If restriction is to specification, do the following:
a. Turn ignition switch to OFF.
b. Reconnect EGR control valve.
c. Turn ignition switch to ON.
d. Clear all DTCs.
e. Continue Performance Diagnostics.
• If restriction is above specification, remove exhaust pipe from turbocharger outlet and retest.
• If restriction is to specification with exhaust pipe removed, do the following:
a. Turn ignition switch to OFF.
b. Reconnect EGR control valve.
c. Turn ignition switch to ON.
d. Clear all DTCs.
e. Correct problem from turbocharger outlet to tail pipe.
• If exhaust back pressure is still high with pipe removed from turbocharger outlet, do the following:
a. Turn ignition switch to OFF.
b. Reconnect EGR control valve.
c. Turn ignition switch to ON.
d. Clear all DTCs.
e. An inoperative turbocharger is suspect. Do Test 13 Air Management and Test 14 VGT Test.
Possible Causes
• Restricted exhaust pipe
• Collapsed exhaust pipe
• Damaged muffler
• Turbocharger malfunction
• Clogged catalytic converter
• Clogged Catalyzed Diesel Particulate Filter (CDPF) – dependent on application
Monitoring EBP using Pressure Sensor Breakout Harness
NOTE: Do this procedure, if an EST is not available. This is an alternate method.
Tools
• Pressure sensor breakout harness
• Digital Multimeter (DMM)
1. See “DT 466 Performance Specifications” – Appendix A (page 595) or “DT 570 and HT 570 Performance Specifications” – Appendix B (page 619) for specifications and record on Diagnostic Form.
2. Connect Pressure Sensor Breakout Harness to engine harness and EBP sensor.
3. Use DMM to measure EBP at high idle, no load.
• Connect POS to green (signal circuit) and NEG to black (signal ground).
4. Run engine at high idle, no load.
5. Record results on Diagnostic Form.
• If restriction is to specification, do the following:
a. Turn ignition switch to OFF.
b. Reconnect EGR control valve.
c. Turn ignition switch to ON.
d. Clear all DTCs.
e. Continue Performance Diagnostics.
• If restriction is above specification, remove exhaust pipe from turbocharger outlet and retest.
• If restriction is to specification with exhaust pipe removed, do the following:
a. Turn ignition switch to OFF.
b. Reconnect EGR control valve.
c. Turn ignition switch to ON.
d. Clear all DTCs.
e. Correct problem from turbocharger outlet to tail pipe.
• If exhaust back pressure is still high with pipe removed from turbocharger outlet, do the following:
a. Turn ignition switch to OFF.
b. Reconnect EGR control valve.
c. Turn ignition switch to ON.
d. Clear all DTCs.
e. An inoperative turbocharger is suspect. An EST is needed to run Test 13 Air Management and Test 14 VGT Test.
