DD15 Troubleshooting – Section 31.3 SPN 164/FMI 2

Section 31.3
SPN 164/FMI 2

The fault condition is typically related to a signal drift condition with the Rail Pressure Sensor.‪

Check as follows‪

1. Check for multiple codes.
   1. If additional fault codes are present with 164/2, service the additional fault codes first.
   2. If only 164/2 is present go to the next step.
2. Using DDDL or the DDEC VI break out box, monitor rail pressure sensor voltage.
3. Turn the ignition ON (key ON, engine OFF).
4. Measure the voltage on pin 78 of the 120–pin breakout box.
   1. If the voltage is greater than or equal to 0.580 volts, replace sensor. Refer to "31.3.1 Verify Repairs" .
   2. If the voltage is less than or equal to 0.420 volts; replace sensor. Refer to "31.3.1 Verify Repairs" .
   3. If the voltage is between .420 and .580 volts, go to next step.
5. Start the engine and bring it up to operating temperature (over 140°F/60°C).
6. Turn the engine OFF and allow engine to soak for 10 minutes.
7. Turn the ignition ON (key ON, engine OFF) and measure the voltage on pin 78 of the 120–pin breakout box.
   1. If the voltage is greater than or equal to 0.580 volts, replace sensor. Refer to "31.3.1 Verify Repairs" .
   2. If the voltage is less than or equal to 0.420 volts; replace sensor. Refer to "31.3.1 Verify Repairs" .
   3. If the voltage is between .420 and .580 volts, there is no problem.

Section 31.3.1
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.