DD15 SPN 647/FMI 5 Troubleshooting

SPN 647/FMI 5

This fault code indicates that there is an open circuit.‪

Open Circuit Check

Check as follows:‪

1. Check for multiple codes.
   1. If SPN 1071/5, SPN 1672/5, and SPN 647/5 are active, repair the open in between pin 91 of the 120–pin MCM connector and the fan and the Jake Brake solenoids. Refer to “57.3.2 Verify Repairs” .
   2. If only SPN 647/5 is active, go to the next step.
2. Disconnect the fan control solenoid connector.
3. Turn the ignition ON (key On, engine OFF).
4. Measure the voltage between pin 1 and 2 of the fan control solenoid connector.
   1. If the voltage is less than 11.5 volts, go to the next step.
   2. If the voltage is between 11.5 and 13.5 volts, replace the fan control solenoid. Refer to “57.3.2 Verify Repairs” .
5. Measure the voltage between pin 2 of the fan control solenoid connector and pin 91 of the 120–pin MCM connector. Refer to “57.3.2 Verify Repairs” .
   1. If the voltage is less than 11.5 volts, repair the open between pin 2 of the fan control solenoid connector and ground. Refer to “57.3.2 Verify Repairs” .
   2. If the voltage is greater than 11.5, repair the open between pin 1 of the fan control solenoid connector and pin 98 of the 120–pin MCM connector. Refer to “57.3.2 Verify Repairs” .

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.