Section 18.2 Reading the Diagnostic Codes

Codes can be read using the flash method, with the Diagnostic Data Reader (DDR) or with Detroit Diesel Diagnostic Link® (DDDL) software.‪

Codes are either active or inactive. Active codes are the codes which are currently keeping the amber or red warning lamp on. Active codes are flashed via the SEL/RSL. Inactive codes are all the codes previously logged in the ECM/ECU. These codes can be cleared by using the DDR. Inactive codes are flashed via the CEL/AWL.‪

Note: If you are here to begin diagnosis of a problem and already know how to read codes, as well as understand active and inactive codes, refer to "18.3 First Step for Diagnosing a Fault Within the DDEC System" .

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Section 18.2.1 Flash Codes

The following steps describe the flash method to interpret diagnostic codes:‪

Note: The Diagnostic Request Switch reads codes on the CEL/AWL and SEL/RSL when an DDR is not available. The following steps will enable you to obtain codes.

Turn vehicle ignition switch ON.Press and hold the Diagnostic Request Switch. As an example, observe Code 13 (active) and Code 21 (inactive) flashing out on the CEL/AWL and SEL/RSL; see Figure "Flash Code Method" .

Figure 1. Flash Code Method

If your application has an SEO/Diagnostic Request Switch for input, press and release the switch.If your application has a Diagnostic Request Switch for input, press and hold switch.

Note: Active codes are flashed in ascending numerical flash code order. Inactive codes are flashed in most recent to least recent order.

Fault codes can only be cleared using the DDR.‪

Note: Removing the battery cables will not clear codes.

Section 18.2.2 Reading Codes with the Diagnostic Data Reader

Flash codes are used for operator convenience to advise of an engine fault or sensor failure. SAE specific codes are read with the Diagnostic Data Reader (DDR). In some cases, one flash code may be used to cover more than one component fault. For this reason the DDR (or Diagnostic Data Link, DDL) must be used to identify the specific code.‪

For instructions for using the DDR or Pro-Link® 9000, ( see Figure "Pro-Link 9000" ), refer to the Pro-Link Users Manual. For a list of Flash Codes and SAE Fault Codes, refer to "18.4 Code Descriptions" . ‪


Figure 2. Pro-Link 9000

The Diagnostic Code Menu selections are defined as follows.‪

Active codesInactive codesClear codes

Start with the Menu Selection screen. ‪

To call up active codes, select ENGINE and ENTER three times.‪

To call up inactive codes:‪

Select ENGINE and ENTER twice.Select INACTIVE CODES and ENTER.

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To clear codes:‪

Select ENGINE and push ENTER twice.Go down and select CLEAR CODES and ENTER.Left to YES, and ENTER.Wait and then push FUNC three times.Go to lines 1 and 2 of the Engine Data List, Active and Inactive Codes, and verify that both lines display NO.Section 18.2.3 FAULT CODES AND DDDL

The Fault Codes window is displayed when you choose “Fault Codes” from the Diagnostics menu. See Figure "Fault Code Window" .‪


Figure 3. Fault Code Window

The following fault code window information covers all DDDL versions:‪

The light bulb symbol on the left indicates if the code is still active.The window displays both the DDEC flash code and the SAE code notation (SID or PID and the FMI). The engine hour when the code first occurred is displayed.If the code is historic, the engine hour when the code last appeared is displayed as well, along with the total duration time of the code for all counts logged.You may access the troubleshooting help guide for a particular code by highlighting the code you wish to work on with a single left mouse click and then selecting the Troubleshooting Help option.
Series 60 DDEC V Troubleshooting Guide - 6SE570