Series 50G/60G Troubleshooting – Section 5.18 PID 105, FMI 3, Flash Code 27, Air Temperature Sensor Input Voltage High

Section 5.18
PID 105, FMI 3, Flash Code 27, Air Temperature Sensor Input Voltage High

The voltage is high for the Air Temperature Sensor due to a short or an open wire.‪

Section 5.18.1
Troubleshooting PID 105, FMI 3, FLASH CODE 27

Troubleshoot as follows:‪

1. Check wire 132 (white, air temperature) cavity N-2 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 (air temperature) in the Air Temperature Sensor connector. Repair or replace any open wires, 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 If the code is no longer active, refer to "5.18.2 Verification" .
2. Check wire 132 (white, air temperature) cavity N-2 in the ESH 30–pin connector for a short to wire 416 (gray, sensor supply, 5VDC) cavity W-1 in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin B (air temperature) in the Air Temperature Sensor connector. 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 If the code is no longer active, refer to "5.18.2 Verification" .

Section 5.18.2
Verification

Verify troubleshooting as follows: ‪

1. Check the DDR to see if PID 105, FMI 3, Flash Code 27 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.