DD15 SPN 1071/FMI 4 Troubleshooting

SPN 1071/FMI 4

This fault indicates that there is a short to ground.‪

Check as follows:‪

1. Turn the ignition OFF.
2. Disconnect the fan control solenoid.
3. Disconnect the 120–pin MCM connector.
4. Measure the resistance between pin 1 of the fan control solenoid and ground.
   1. If the resistance is less than 5 Ω, repair the short to ground between pin 1 of the fan control solenoid and pin 33 of the 120–pin MCM connector. Refer to “78.2.1 Verify Repairs” .
   2. If the resistance is greater than 5 Ω, repair the short to ground between pin 2 of the fan control solenoid and pin 91 of the 120–pin MCM connector. Refer to “78.2.1 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.