10.7
CRUISE CONTROL INOPERATIVE
2. Disconnect the vehicle harness connector at the ECM.
3. Find a means to press and hold the set/coast switch.
4. Measure resistance between the set/coast cavity (i.e. J1) and a good ground.
[a] If the resistance measurement is greater than 5 , or open, the set/coast switch is
open or miswired, circuit #953 is open, or there is a bad battery ground. Rewire,
repair the short or replace the switch. Refer to section 10.7.16.
[b] If the resistance measurement is less than or equal to 5 , refer to section 10.7.2.
10.7.13 Check for Short at the Res/Accel Circuit
Perform the following steps to check for a short:
1. Turn ignition OFF.
2. Disconnect the vehicle harness connector at the ECM.
3. Measure resistance between the Res/Accel cavity (i.e. G3) and a good ground.
[a] If the resistance measurement is less than or equal to 100 , the Res/Accel switch is
shorted, or a short to ground exists in the Res/Accel circuit (i.e. #541). Repair the
short or replace the switch. Refer to section 10.7.16.
[b] If the resistance measurement is greater than 100 , refer to section 10.7.2.
10.7.14 Check for Open at the Res/Accel Circuit
Perform the following steps to check for an open:
1. Turn ignition OFF.
2. Disconnect the vehicle harness connector at the ECM.
3. Find a means to press and hold the Res/Accel switch.
4. Measure resistance between the Res/Accel cavity (i.e. G3) and a good ground.
[a] If the resistance measurement is greater than 5 , or open, the Res/Accel switch is
open or miswired, circuit #953 is open or the battery ground is bad. Repair the short,
replace the switch, or rewire. Refer to section 10.7.16.
[b] If the resistance measurement is less than or equal to 5 , refer to section 10.7.2.
10.7.15 Verify Problem Still Exists
Perform the following steps to verify the problem still exists:
1. If you were referred to this step, you have completed the switch checkout process without
detecting a fault.
2. Take the vehicle for a road test and check the cruise control operation.
All information subject to change without notice.
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6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
