This diagnosis is typically a CAN3 communication error.
94.1.1 CAN3 Check
Check as follows:
1. Check for multiple codes.
[a] If codes other than SPN 2795/FMI 9 are present, repair those first.
[b] If only SPN 2795/FMI 9 is present, go to step 2.
2. Disconnect the turbo actuator connector.
3. Turn the ignition ON (key ON, engine OFF).
4. Measure the voltage between pin 1 of the turbo actuator connector and ground.
[a] If the voltage is less than 11 volts, repair the cause of low or no voltage between
pin 1 of the turbo actuator connector and pin 93 of the MCM 120–pin connector.
Refer to section 94.1.1.1.
[b] If the voltage is greater than 11 volts, go to step 5.
5. Turn the ignition OFF.
6. Disconnect the MCM 120–pin connector.
7. Measure the resistance between pin 4 of the turbo actuator connector and ground.
[a] If the resistance is less than 5 Ω, repair the short to ground between pin 4 of the turbo
actuator connector and pin 75 of the MCM 120–pin connector. Refer to section
94.1.1.1.
[b] If the resistance is greater than 5 Ω, go to step 8.
8. Measure the resistance between pin 2 of the turbo actuator connector and pin 38 of the
MCM 120–pin connector.
[a] If the resistance is greater than 5 Ω, repair the open between pin 2 of the turbo actuator
connector and pin 38 of the MCM 120–pin connector. Refer to section 94.1.1.1.
[b] If the resistance is less than 5 Ω, go to step 9.
9. Measure the resistance between pin 3 of the turbo actuator connector and pin 74 of the
MCM 120–pin connector.
[a] If the resistance is greater than 5 Ω, repair the open between pin 3 of the turbo actuator
connector and pin 74 of the MCM 120–pin connector. Refer to section 94.1.1.1.
[b] If the resistance is less than 5 Ω, go to step 10.
10. Measure the resistance between pin 4 of the turbo actuator connector and pin 75 of the
MCM 120–pin connector.
[a]If the resistance is greater than 5 Ω, repair the open between pin 4 of the turbo actuator
connector and pin 75 of the MCM 120–pin connector. Refer to section 94.1.1.1.
[b]If the resistance is less than 5 Ω, replace the turbo actuator. Refer to section 94.1.1.1.
94.1.1.1 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.
