DDEC TROUBLESHOOTING
18.3 TROUBLESHOOTING FLASH CODE 18
The following procedure will troubleshoot Flash Code 18.
18.3.1
Check Actuator
Perform the following steps to check the actuator.
1. Unplug throttle actuator harness connector.
2. Install a jumper wire between cavity F and C.
3. Turn ignition ON.
4. Plug in DDR. Read the codes.
[a] If code p 051/3 and any other codes are logged, refer to section 18.3.2.
[b] If code p 051/4 is logged, refer to section 18.3.3.
18.3.2
Check Connectors
Perform the following steps to check the connectors.
1. Turn ignition OFF.
2. Remove jumper wire.
3. Check connectors, both ECM and throttle actuator side, for bent, broken, or loose
connections.
[a] If the connectors are not damaged, replace the actuator and refer to section 18.3.7.
[b] If the connectors are damaged, bent or have broken pins, repair or replace them.
Refer to section 18.3.7.
18.3.3
Check for Open
Perform the following steps to check for open.
1. Turn ignition OFF.
2. Move jumper wire from cavity F and C to cavity F and D.
3. Remove engine harness connector.
4. Measure resistance between Y2 (#452) and R1 (#907). See Figure 18-1.
[a] If the measured resistance is greater than 1,000
, wire #907 is open. Repair the
open or replace the harness and refer to section 18.3.7.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
18-5
