27.1 SPN 103/FMI 0
This diagnosis is typically turbocharger speed below threshold (Low Box).
27.1.1
Low Speed Check (Low Box)
Check as follows:
1. Inspect the entire air intake system for leaks and/or restrictions.
[a] If leaks or restrictions are found, repair as necessary. Refer to section 27.1.1.1.
[b] If no air intake system leaks or restrictions are found, go to step 2.
2. Connect to DDDL 7.0
3. Turn the ignition ON (key On, engine OFF).
4. Perform the DDDL Turbo Hysteresis Test.
[a] If the test passed, replace the Turbo Speed Sensor (TSS). Refer to section 27.1.1.1.
[b] If the test failed, refer to section 6.5 in the Series 60 Service Manual (6SE2007).
27.1.1.1
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.
27.2 SPN 103/FMI 1
This diagnosis is typically turbocharger speed below threshold (High Box).
27.2.1
Low Speed Check (High Box)
Check as follows:
1. Inspect the entire air intake system for leaks and/or restrictions.
[a] If leaks or restrictions are found, repair as necessary. Refer to section 27.2.1.1.
[b] If no air intake system leaks or restrictions are found, go to step 2.
2. Connect to DDDL 7.0
3. Turn the ignition ON (key On, engine OFF).
4. Perform the DDDL Turbo Hysteresis Test.
[a] If the test passed, replace the Turbo Speed Sensor (TSS). Refer to section 27.2.1.1.
[b] If the test failed, refer to section 6.5 in the Series 60 Service Manual (6SE2007).
27.2.1.1
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.
27.3 SPN 103/FMI 4
This diagnosis is typically circuit failed low.
27.3.1
Short Circuit Check
Check for short as follows:
1. Disconnect the Turbo Speed Sensor (TSS).
2. Disconnect the 120–pin MCM connector.
3. Measure the resistance across pins 1 and 2 of the TSS connector.
[a] If the resistance is less than 5 Ω, repair the short between the 120–pin MCM
connector wires 50 and 51. Refer to section 27.3.1.1.
[b] If the resistance is greater than 5 Ω, go to step 4.
4. Measure the resistance between pin 1 of the TSS harness connector and ground.
[a] If the resistance is less than 5 Ω, repair the short between pin 1 of the TSS harness
connector and ground. Refer to section 27.3.1.1.
[b] If the resistance is greater than 5 Ω, go to step 5.
5. Measure the resistance between pin 2 of the TSS harness connector and ground.
[a] If the resistance is less than 5 Ω, repair the short between pin 2 of the TSS harness
connector and ground. Refer to section 27.3.1.1.
[b] If the resistance is greater than 5 Ω, refer to section 27.3.1.1.
27.3.1.1
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.
