Series 50G/60G Troubleshooting – Section 5.19 PID 105, FMI 4, Flash Code 28, Air Temperature Sensor Input Voltage Low

Section 5.19
PID 105, FMI 4, Flash Code 28, Air Temperature Sensor Input Voltage Low

The input voltage is low for the Air Temperature Sensor due to a short.‪

Section 5.19.1
Troubleshooting PID 105, FMI 4, FLASH CODE 28

Troubleshoot as follows:‪

1. Check wire 132 (white, air temperature) cavity N-2 in the Engine Sensor Harness (ESH) 30–pin connector for a short to ground (see Figure "Engine Sensor Harness 30–pin Connector" ). If there is a short, repair or replace the wire(s), pins, and sockets.
   

   Figure 1. Engine Sensor Harness 30–pin Connector

   1. If the code is still active, go to step .
   2. If the code is no longer active, refer to "5.19.2 Verification" .
2. Check pin B (air temperature) in the Air Temperature Sensor connector for a short. If there is a short, repair or replace the wire(s), pins, and sockets.
   1. If the code is still active, call Detroit Diesel Technical Service.
   2. If the code is no longer active, refer to "5.19.2 Verification" .

Section 5.19.2
Verification

Verify troubleshooting as follows: ‪

1. Check the DDR to see if PID 105, FMI 4, Flash Code 28 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.