Series 50G/60G Troubleshooting – Section 5.25 PID 108, FMI 4, Flash Code 87, Barometric Pressure Sensor Input Voltage Low

Section 5.25
PID 108, FMI 4, Flash Code 87, Barometric Pressure Sensor Input Voltage Low

The input voltage on the Barometric Pressure Sensor (BARO Sensor) is low due to an open wire or a short.‪

Section 5.25.1
Troubleshooting PID 108, FMI 4, FLASH CODE 87

Troubleshoot as follows:‪

1. Check wire 904 (purple/white, barometric pressure) cavity L-1 in the Engine Sensor Harness (ESH) 30–pin connector to see if it is open (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin B (barometric pressure) in the BARO Sensor connector. Repair or replace any open wire(s).
   

   Figure 1. Engine Sensor Harness 30–pin Connector

   1. If the code is still active, go to step .
   2. If the code is not active, refer to "5.25.2 Verification" .
2. Check wire 904 (purple/white, barometric pressure) cavity L-1 in the ESH 30–pin connector for a short to ground (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin B (barometric pressure) in the BARO Sensor connector. If there is a short, repair or replace any open wire(s).
   1. If the code is still active, call Detroit Diesel Technical Service.
   2. If the code is not active, refer to "5.25.2 Verification" .

Section 5.25.2
Verification

Verify troubleshooting as follows: ‪

1. Check the DDR to see if PID 108, FMI 4 Flash Code 87 is still active.
   1. If the code is still active, go to step 2.
   2. If the code is not active, troubleshooting is complete.
2. If the code is still active, call Detroit Diesel Technical Service.