CHECK ENGINE LIGHT AND STOP ENGINE LIGHT FAULT
Activate Light With Diagnostic Data Reader
Perform the following steps to activate the light with the DDR:
1. Turn ignition ON.
2. Plug in DDR.
3. Select Activate Outputs.
4. Activate affected light; watch status.
[a] If the light stays off. Refer to section 10.4.6.
[b] If the light illuminates, the problem no longer exists. Refer to DDEC III Application
and Installation manual, 7SA800, to review the light operation.
Perform the following steps to check the bulb:
1. Turn ignition OFF.
2. Refer to OEM recommendations for checking bulb.
[a] If the bulb is bad, replace the bulb and refer to section 10.4.9.
[b] If the bulb is okay, refer to section 10.4.7.
Check for Voltage Supply
Perform the following steps to check the voltage supply:
1. Disconnect the power supply to the light.
2. Turn ignition ON.
3. Measure voltage between the removed connection and battery ground.
[a] If the voltage is correct based on the system of the vehicle (12/24V),
refer to section 10.4.8.
[b] If the voltage is too low to expect the bulb to light, refer to the OEM recommendations
to resolve the problem. Refer to section 10.4.9.
Check for Open Output Wire
Perform the following steps to check for an open output wire:
1. Measure the resistance between the ground side of the connector of the light and the
[a] If the measured resistance is 45,000 to 48,000 , clean the connections.
Refer to section 10.4.9.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION