Detroit Diesel MBE 900 Technician Manual page 56

CODES
4. Inspect the EGR control valve for mechanical problems.
[a] Ensure the valve moves freely between the open and closed positions. Ensure the
springs return the valve to the closed position. If required, replace the valve. Erase
the fault code memory and verify repairs. Refer to section 4.3.2.6.
[b] If the valve functions properly, go to step 5 for the MBE 4000 engine and step 6 for
the MBE 900 engine.
5. For the MBE 4000 engine, inspect the EGR shutoff valve.
[a] Ensure the valve moves freely between the open and closed positions. Ensure the
valve stays in the open position when no air pressure is applied. If required, replace
the valve. Erase the fault code memory and verify repairs. Refer to section 4.3.2.6.
[b] If the valve functions properly, go to step 6.
6. Check for damage to the reed valves as follows:
[a] Look for open valves (damaged or stuck). Replace valves as required.
[b] Look for heavy soot deposits on the valves. If necessary, clean valves. Erase fault
code memory and verify repairs. Refer to section 4.3.2.6.
[c] If the reed valve is undamaged, go to step 7.
7. Visually inspect the EGR cooler for damage or leaking.
[a] If the cooler is damaged and leaking, repair or replace cooler as required. Erase the
fault code memory and verify repairs. Refer to section 4.3.2.6.
[b] If fault code s 146/1 is still active, contact the Detroit Diesel Customer Support
Center at 313-592-5800.
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All information subject to change without notice. (Rev. 5/05)
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