10.14
OPTIMIZED IDLE FEATURE DOES NOT FUNCTION
4. Check the vehicle power down relay switch. Select switch light status (VEH PWR
DOWN).
[a] If the output status reads ON, check the relay and relay connections for proper
operation. Refer to section 10.14.3.
[b] If the output status does not read ON, install a test ECM. Refer to section 10.14.11.
10.14.3 Check Optimized Idle Active Light
The Optimized Idle active light should flash when all of the following occur:
1. Engine idling.
2. The transmission is in NEUTRAL and high-range, if equipped.
3. The hood is closed and the park brake is set.
4. The cruise switch is turned ON.
[a] If the active light is not flashing, refer to section 10.14.4.
[b] If the light is flashing, after the engine shuts down, turn the thermostat on. When the
light flashes, if the alarm turns ON and the engine starts, the system is OK.
[c] If the light is flashing, after the engine shuts down, turn the thermostat on. When
the light flashes, if the alarm does not turn ON and the engine does not start,
refer to section 10.14.10.
10.14.4 Check Idle Condition
Perform the following steps to troubleshoot Optimized Idle:
1. Check idle condition.
2. Verify the engine is at idle and not running on VSG. Optimized idle will not function if the
engine is running on VSG, unless the idle timer is enabled on VSG.
[a] If the engine is not at idle, turn off the ISD on the VSG. Refer to section 10.14.11.
[b] If the engine is at idle, refer to section 10.14.5.
10.14.5 Check Idle Shutdown Enabled
Perform the following steps to troubleshoot Optimized Idle:
1. Check for idle shutdown enabled.
2. Using the DDR, view the calibration.
[a] If idle shutdown is not enabled, enable the idle shutdown and set a shutdown time.
Refer to section 10.14.11.
[b] If the idle shutdown is enabled, refer to section 10.14.6.
All information subject to change without notice.
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6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
