DDEC TROUBLESHOOTING
1. Turn ignition ON.
2. Plug in DDR. Select ACTIVATE OUTPUTS.
3. Activate output associated with the fault.
NOTE:
Service any other codes first.
[a] If the feature operates (e.g. light illuminates or solenoid activates, etc.) review the
Application and Installation manual for the operation of the designated feature.
Operation is dependent on other parameters. Refer to section 10.12.6.
[b] If the feature does not operate or cannot be activated, refer to section 10.12.3.
10.12.3 Check for Open
Perform the following steps to check for open:
1. Turn ignition OFF.
2. Locate device end of output wire (e.g. light) and disconnect wire.
3. Turn ignition ON.
4. Measure resistance between the disconnected wire and battery (-).
[a] If the measured resistance is less than 46,000-48,000 , refer to section 10.12.4.
[b] If the measured resistance is greater than 48,000 , the wire is open.
Refer to section 10.12.6.
10.12.4 Check for Voltage
Perform the following steps to check the voltage:
1. Measure voltage between the disconnected wire and a good ground.
[a] If voltage measurement is less than 2 volts, refer to section 10.12.5.
[b] If voltage measurement is greater than 2 volts, the output is shorted to a voltage
source. Replace the wire and refer to section 10.12.6.
10.12.5 Check for Resistance
Perform the following steps to check for resistance at the ECM:
1. Turn ignition OFF.
2. Disconnect 30-pin connector that houses the wire/function you are checking (e.g.
X3-engine harness connector, A1-VIH).
3. Measure resistance between the pin on the ECM and the ECM case.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
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