DD15 Troubleshooting – Section 81.1 SPN 1077/FMI 5

Section 81.1
SPN 1077/FMI 5

SPN 1077/FMI 5 indicates a quantity control valve current too low.‪

Check as follows:‪

1. Disconnect the quantity control valve.
2. Measure the resistance across pins 1 and 2 of the quantity control valve.
   1. If the resistance is greater than 2 Ω, replace quantity control valve. Refer to "81.1.1 Verify Repairs" .
   2. If the resistance is less than 2 Ω, go to the next step.
3. Disconnect the MCM 120-pin connector.
4. Measure the resistance between pin 1 of the MCM 120-pin connector and pin 1 of the quantity control valve.
   1. If the resistance is less than 5 Ω, go to next step.
   2. If the resistance is greater than 5 Ω, repair the open circuit between pin 1 of the 120 MCM connector and pin 1 of the quantity control valve. Refer to "81.1.1 Verify Repairs" .
5. Measure the resistance between pin 2 of the MCM 120-pin connector and pin 2 of the quantity control valve.
   1. If the resistance is less than 5 Ω, call the Detroit Diesel Customer Support Center at 313–592–5800 for authorization to replace the MCM.
   2. If the resistance is greater than 5 Ω, repair the open circuit between pin 2 of the MCM 120-pin connector and pin 2 of the quantity control valve. Refer to "81.1.1 Verify Repairs" .

Section 81.1.1
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.

   ENGINE EXHAUST ‪
   To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

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.