Kohler command pro ECH749 Service Manual page 72

EFI SYSTEM-BOSCH
If governor/throttle components are all intact, but you think there may be a problem with adjustment, follow Procedure
A to check setting. If governor lever was loosened or removed, go immediately to Procedure B to perform initial
adjustment.
A. Checking Initial Adjustment
1. Unsnap plastic linkage bushing attaching throttle linkage to governor lever. Unhook damper spring from lever,
separate linkage from bushing, and remove bushing from lever. Mark hole position and unhook governor
spring from governor lever.
2. Check if engine has a high-speed throttle stop screw installed in manifold casting boss.
a. On engines without a stop screw, pivot throttle shaft and plate assembly into FULL THROTTLE position.
Insert a 1.52 mm (0.060 in.) feeler gauge between rear tang of throttle shaft plate and underside of manifold
boss. Use a locking pliers (needle nose works best) to temporarily clamp parts in this position.
b. On engines with a stop screw, pivot throttle shaft and plate into FULL THROTTLE position, so tang of
throttle shaft plate is against end of high-speed stop screw. Temporarily clamp in this position.
3. Rotate governor lever and shaft counterclockwise until it stops. Use only enough pressure to hold it in that
position.
4. Check how end of throttle linkage aligns with bushing hole in governor lever. It should fall in center of hole. If it
doesn't, perform adjustment procedure as follows.
B. Setting Initial Adjustment
1. Check split where clamping screw goes through governor lever. There should be a gap of at least 1/32". If tips
are touching and there is no gap present, lever should be replaced. If not already installed, position governor
lever on cross shaft, but leave clamping screw loose.
2. Follow instructions in Step 2 of Checking Initial Adjustment, then reattach throttle linkage to governor lever with
bushing clip. It is not necessary to reattach damper or governor springs at this time.
3. Insert a nail into hole in top of cross shaft. Using light pressure, rotate governor shaft counterclockwise as far
as it will turn, then torque nut on clamping screw to 6.8 N·m (60 in. lb.). Make sure that governor arm has not
twisted up or down after nut has been tightened.
4. Verify that governor has been set correctly. With linkage still retained in FULL THROTTLE position (Step 2),
unsnap bushing clip, separate linkage from bushing, and remove bushing from lever. Follow Steps 3 and 4 in
Checking Initial Adjustment.
5. Reconnect dampening spring into its governor lever hole from bottom. Reinstall bushing and reattach throttle
linkage. Reattach governor spring in marked hole.
6. Start engine and allow it to fully warm up and establish closed loop operation (approximately 5-10 min.). Check
speed settings and adjust as necessary, fi rst low idle speed, and then high speed setting.
TROUBLESHOOTING
Troubleshooting Guide
Condition
Fuel pump not running.
Faulty spark plugs.
Old/stale fuel.
Incorrect fuel pressure.
Speed sensor loose or faulty.
Engine Starts Hard
or Fails to Start TPS offset incorrect (initialization).
When Cold.
Engine temperature sensor faulty.
Engine temp sensor faulty.
Faulty coils.
Low system voltage.
Faulty injectors.
72
Possible Cause
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