67.1 SPN 704/FMI 3
This diagnosis is typically a short to power.
67.1.1
Short to Power Check
Check as follows:
1. Disconnect the turbo actuator connector.
2. Turn the ignition ON (key ON, engine OFF).
3. Measure the voltage between pin 3 of the turbo actuator connector and chassis ground.
[a] If the voltage is greater than 4.5 volts, repair the short to power between pin 3 of the
turbo actuator connector and pin 35 of the 120–pin MCM connector. Refer to section
67.1.1.1.
[b] If the voltage is less than 4.5 volts, go to step 4.
4. Turn the ignition OFF.
5. Disconnect the 120–pin MCM connector.
6. Measure the resistance between pin 1 and pin 3 of the turbo actuator connector.
[a] If the resistance is less than 5 Ω, repair the short between pins 1 and 3 of the
turbo actuator connector and pins 35 and 93 of the 120–pin MCM connector.
Refer to section 67.1.1.1.
[b] If the resistance is greater than 5 Ω, refer to section 67.1.1.1.
67.1.1.1
Verify Repairs
Verify repairs as follows:
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.
67.2 SPN 704/FMI 4
This diagnosis is typically a short to ground.
67.2.1
Short Circuit Check
Check as follows:
1. Disconnect the turbo actuator connector.
2. Disconnect the 120–pin MCM connector.
3. Measure the resistance between pins 1 and 3 of the turbo actuator connector.
[a] If the resistance is less than 5 Ω, repair the short between pins 35 and 93 of the
120–pin MCM connector. Refer to section 67.2.1.1.
[b] If the resistance is greater than 5 Ω, go to step 4.
4. Measure the resistance between pins 2 and 3 of the turbo actuator connector.
[a] If the resistance is less than 5 Ω, repair the short between pins 35 and 38 of the
120–pin MCM connector. Refer to section 67.2.1.1.
[b] If the resistance is greater than 5 Ω, go to step 5.
5. Measure the resistance between pin 3 of the turbo actuator connector and ground.
[a] If the resistance is less than 5 Ω, repair the short between pin 3 of the turbo actuator
connector and ground. Refer to section 67.2.1.1.
[b] If the resistance is greater than 5 Ω, go to step 6.
6. Measure the resistance between pin 1 of the turbo actuator connector and ground.
[a] If the resistance is less than 5 Ω, repair the short between pin 1 of the turbo actuator
connector and ground. Refer to section 67.2.1.1.
[b] If the resistance is greater than 5 Ω, refer to section 67.2.1.1.
67.2.1.1
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.
67.3 SPN 704/FMI 5
This diagnosis is typically an open circuit.
67.3.1
Open Circuit Check
Check as follows:
1. Perform the Turbo Actuator Hysteresis Test using Artesian software and a turbo interface
cable.
[a] If the hysteresis test fails, replace the turbo actuator.
[b] If the hysteresis test result is pass or unable to perform hysteresis test, go to step 2.
2. Disconnect the turbo actuator connector.
3. Turn the ignition ON (key ON, engine OFF).
4. Measure the voltage between pins 1 and 2 of the turbo actuator connector.
[a] If the voltage is greater than 11.5 volts, go to step 6.
[b] If the voltage is less than 11.5 volts, go to step 5.
5. Measure the voltage between pin 1 of the turbo actuator connector and chassis ground.
[a] If the voltage is between 11 and 13 volts, repair the open in the wire between
pin 38 of the 120–pin MCM connector and pin 2 of the turbo actuator connector.
Refer to section 67.1.1.1.
[b] If the voltage is less than 11 volts, repair the open in the wire between pin 93 of the
120–pin MCM connector and pin 1 of the turbo actuator connector. Refer to section
67.1.1.1.
6. Turn the ignition OFF.
7. Disconnect the 120–pin MCM connector.
8. Measure the resistance between pin 3 of the turbo actuator connector and pin 35 of the
120–pin MCM connector.
[a] If the resistance is less than 3 Ω, re-verify this procedure. If the results are the same
contact the Detroit Diesel Customer Support Center (313–5925800).
[b] If the resistance is greater than 3 Ω, repair the open circuit in the wire between
pin 3 of the turbo actuator connector and pin 35 of the MCM 120–pin connector.
Refer to section 67.1.1.1.
