Series 60 - EGR VALVE POSITION CIRCUIT FAULT - SPN 27/FMI 4 - Detroit Diesel Troubleshooting Diagrams (2024)

This diagnostic condition is typically a circuit failed high.
19.2.1
EGR Valve Position Circuit Check
Check as follows:
1. Check for multiple codes.
[a] If 27/4, 2791/5 and 1073/4 are present, repair the open between pin 62 of the 120–pin MCM connector, the EGR valve and the Front Jake Brake Solenoid. Refer to section 19.2.1.1.
[b] If 27/4 and 3471/4 are present, go to step 6.
[c] If 27/4 and 3482/4 are present, go to step 8.
[d] If 27/4 and 1073/4 are present, go to step 10.
[e] If 27/4 and 615/4 are present, go to step 14.
[f] If only 27/4 is present, go to step 2.
2. Disconnect the EGR valve harness connector.
3. Measure the resistance between pin 4 of the EGR valve harness connector and ground.
[a] If the resistance is less than 1 kΩ, repair the short to ground between pin 4 of the EGR
valve harness connector and pin 60 of the 120–pin MCM connector. Refer to section 19.2.1.1.
[b] If the resistance is greater than 1 kΩ, go to step 4.
4. Disconnect the MCM 120–pin connector.
5. Measure the resistance between pin 4 of the EGR valve harness connector and pin 60
of the 120–pin MCM connector.
[a] If the resistance is greater than 3 Ω, repair the open between pin 4 of the EGR valve harness connector and pin 60 of the 120–pin MCM connector. Refer to section 19.2.1.1.
[b] If the resistance is less than 3 Ω, replace the EGR valve. Refer to section 19.2.1.1.
6. Monitor the active codes; unplug the Electronic Dosing Valve (EDV). Does the code
become inactive?
[a] If yes, replace the EDV. Refer to section 19.2.1.1.
[b] If no, go to step 7.
7. Unplug the EGR valve. Does the code become inactive?
[a] If yes, replace the EGR valve. Refer to section 19.2.1.1.
[b] If no, repair the short to ground on circuit 65 of the 120–pin MCM connector. Refer to section 19.2.1.1.
8. Monitor the active codes; unplug the Fuel Cutoff Valve (FCV). Does the code become
inactive?
[a] If yes, replace the FCV. Refer to section 19.2.1.1.
[b] If no, go to step 9.
9. Unplug the EGR valve. Does the code become inactive?
[a] If yes, replace the EGR valve. Refer to section 19.2.1.1.
[b] If no, repair the short to ground on circuit 69 of the 120–pin MCM connector. Refer to section 19.2.1.1.
10. Monitor the active codes; unplug the EGR valve. Does the code become inactive?
[a] If yes, replace the EGR valve. Refer to section 19.2.1.1.
[b] If no, go to step 11.
11. Turn the ignition to the OFF position.
12. Remove the upper valve cover.
13. Disconnect the front Jake Brake solenoid. Does the code become inactive?
[a] If yes, replace the front Jake Brake solenoid. Refer to section 19.2.1.1.
[b] If no, repair the short to ground on circuit 32 of the 120–pin MCM connector. Refer to section 19.2.1.1.
14. Monitor the active codes; unplug the Fuel Cutoff Valve (FCV). Does the code become
inactive?
[a] If yes, replace the FCV. Refer to section 19.2.1.1.
[b] If no, go to step 15.
15. Unplug the EGR valve. Does the code become inactive?
[a] If yes, replace the EGR valve. Refer to section 19.2.1.1.
[b] If no, replace the FCV. go to step 16.
16. Unplug the Electronic Dosing Valve (EDV). Does the code become inactive?
[a] If yes, replace the EDV. Refer to section 19.2.1.1.
[b] If no, repair the short to ground on circuits 62 and/or 64 of the 120–pin MCM connector. Refer to section 19.2.1.1..

19.2.1.1
Verify Repairs
Verify repairs as follows:
1. Turn ignition OFF.
2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
3. Clear codes with DDDL 7.0 or latest version.
4. Start and bring engine up to operating temperature (over 140°F/60°C).
5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps
illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel
Customer Support Center at 313–592–5800.