DDEC TROUBLESHOOTING
28.3 TROUBLESHOOTING FLASH CODE 28
The following procedure will troubleshoot Flash Code 28.
28.3.1
Multiple Code Check
Perform the following steps to check for multiple codes.
1. Turn vehicle ignition switch ON.
2. Plug in DDR.
3. Read active codes.
[a] If code 172/4 was logged and there are no other codes logged, refer to section 28.3.2.
[b] If code 172/4 and any of the following codes 110/3, 175/3, 174/3, 72/3 or 102/3 were
logged, refer to section 90.1.
[c] If code 172/4 and any code except the following were logged 110/3, 175/3, 174/3,
72/3 or 102/3, refer to section 28.3.2.
28.3.2
Sensor Check
Perform the following steps to check the sensor.
1. Turn vehicle ignition OFF.
2. Disconnect the ATS connector. See Figure 28-2.
Figure 28-2
Engine Harness to Air Temperature Sensor Connector
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
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