DDEC TROUBLESHOOTING
10.14 OPTIMIZED IDLE FEATURE DOES NOT FUNCTION
The following procedure will troubleshoot Optimized Idle not functioning.
To avoid personal injury from the engine starting
accidently, do not replace the ECM with an ECM that is
not programmed with Optimized Idle.
To avoid personal injury from the engine starting while
working in the engine compartment, remove the starter
relay from the relay holder before performing any service
or troubleshooting to the Optimized Idle system.
10.14.1 Check Diagnostic Data Reader for Codes
Perform the following steps to check the DDR for codes.
1. Plug DDR into connector.
2. Turn ignition ON.
3. Check the active and inactive codes for any Optimized Idle codes.
4. Turn ignition OFF.
NOTE:
Service any code first.
[a] If an Optimized Idle code 62, 63, or 74 is logged, go to the appropriate flash code
section, based on Optimized Idle code logged.
[b] If an Optimized Idle code 62, 63 or 74 is not logged, refer to section 10.14.2.
10.14.2 Heater and Air Conditioning Fans Do Not Function
Perform the following steps to troubleshoot the heater and A/C fans.
1. Check the heater and A/C blower fuse.
2. Turn ignition ON.
3. Plug in DDR.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
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