Detroit Diesel MBE 900 Technician Manual page 54

CODES
3. Measure the resistance between pin 22 of the 55-pin connector and pin 3 of the EGR
temperature sensor connector. See Figure 4-2.
[a] If resistance is greater than 3 , repair open circuit in wire between pin 22 of the
55-pin connector and pin 3 of sensor connector.
[b] If resistance is less than 3 , check all contacts and connections. If any corrosion
is evident, remove it.
[c] If fault code s 146/0 is no longer active, erase fault code memory and verify repairs.
Refer to section 4.3.2.6.
[d] If fault code s 146/0 is still active, go to step 4.
4. Check coolant usage.
[a] If coolant usage indicates a leak, perform an EGR Cooler Inspection.
Refer to appendix C, Service Information Letter 04 TS - 38. Clean and replace
parts as indicated by inspection. Erase fault code memory and verify repairs.
Refer to section 4.3.2.6.
[b] If coolant usage is normal, go to step 5.
5. Check the following vehicle components for proper function. Repair or replace as
required. Refer to the appropriate OEM Vehicle service manual as required.
[a] Check airflow through the CAC and radiator.
[b] Check fan belt condition for possible slippage.
[c] Check the fan shroud for proper position.
[d] Check the radiator hoses for collapsing.
[e] Check the viscous fan for proper operation.
[f] If fault code s 146/0 is no longer active, erase fault code memory and verify repairs.
Refer to section 4.3.2.6.
[g] If fault code s 146/0 is still active, 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 fault code s 146/0 is still active, contact the Detroit Diesel Customer Support
Center at 313-592-5800.
4-12
All information subject to change without notice. (Rev. 5/05)
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