DD15 Troubleshooting – Section 31.6 SPN 164/FMI 5

Section 31.6
SPN 164/FMI 5

The fault condition is typically Rail Pressure Sensor circuit open or a stuck in range sensor.‪

Check as follows:‪

1. Check for multiple codes
   1. If additional fault codes are present with 615/14, service the additional fault codes first.
   2. If only 615/14 is present go to the next step.
2. Turn the ignition OFF.
3. Disconnect the Rail Pressure Sensor.
4. Turn the ignition ON (key ON, engine OFF).
5. Check for 5 volt supply at pin 3 of the Rail Pressure Sensor.
   1. If voltage is correct, replace the Rail Pressure Sensor. Refer to "31.6.1 Verify Repairs" .
   2. If no voltage was found, repair the circuit between pin 3 of the Rail Pressure Sensor and pin 58 of the MCM 120 MCM connector. Refer to "31.6.1 Verify Repairs" .

Section 31.6.1
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.