DD15 Troubleshooting – Section 30.1 SPN 157/FMI 2

Section 30.1
SPN 157/FMI 2

This diagnostic condition is typically an erratic Fuel Rail Pressure Sensor signal.‪

Check as follows:‪

Note: Step 7 of this procedure (PLV counter) must be verified.

1. Disconnect the Fuel Rail Pressure Sensor.
2. Inspect the Fuel Rail Pressure Sensor harness connector for loose, bent, spread or corroded pins.
   1. If pin damage is found, repair as necessary. Refer to "30.1.1 Verify Repairs" .
   2. If no connector damage is found, go to the next step.
3. Disconnect the MCM 120–pin connector.
4. Inspect pins 58, 78, and 102 for bent, spread or corroded pins.
   1. If pin damage is found, repair as necessary. Refer to "30.1.1 Verify Repairs" .
   2. If no connector damage is found, go to the next step.
5. Connect DDDL 7.X.
6. Turn the ignition ON (key ON, engine OFF).
7. Under the Actions” drop down menu, select “PLV Change.” On the PLV Change screen select “Read Accumulator.”
   1. If the PLV counter is greater than 50, the PLV must be replaced. After PLV replacement, reset the PLV accumulator value via the “Reset Accumulator” button.
   2. If the PLV counter is less than 50, troubleshooting is complete.

Section 30.1.1
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.