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5B.9
Section 5B
EFI Fuel System
5B
b. If light stays on or blinking ceases prematurely,
the procedure was unsuccessful and must be
repeated. Possible causes for unsuccessful
learning may be: 1) Movement occurred in
either the TPS or throttle shaft during
procedure, 2) Crankshaft movement/rotation
was detected by the speed sensor during
procedure, 3) Throttle plate position was out of
learnable range (recheck the 1500 RPM idle
speed adjustment), or 4) Problem with ECU or
TPS.
9. When the initialization procedure has been
successfully completed, turn off the key switch,
remove the jumper wire or connector, and remove
the rubber band from the throttle lever.
10. Disconnect negative (-) battery cable temporarily
to clear all learned adjustments.
11. Reconnect the battery cable and all external
loads. Readjust the idle speed to the equipment
manufacturer’s specified setting and recheck the
high-speed, no-load RPM setting. Observe the
overall performance.
TPS Initialization Procedure
For “32 Pin” (MSE 1.1) Plastic-Cased ECU Only
(“Auto-Learn” Initialization)
1. Check that the basic engine, all sensors, fuel, fuel
pressure, and battery are good and functionally
within specifications.
Important!
2. Remove/disconnect ALL external loads from the
engine (belts, pumps, electric PTO clutch,
alternator, rectifier-regulator, etc.).
3. Locate the service connector plug in the wiring
harness. To initiate the TPS auto-learn function,
connect a jumper wire from the TPS initialization
pin #24 (violet wire) to the battery voltage pin
(red wire), or use jumper plug (SPX Part No.
KO3217-9). If using the PC-based diagnostic tool
and software (Kohler Part No. 25 761 23-S), go to
“Special Tests” and follow the prompts to
complete.
4. Start the engine and immediately observe the
Malfunction Indicator Light (MIL). The light should
start blinking 4 consecutive times every 2
seconds.
“24 Pin” (MSE 1.0) Plastic-Cased ECU:
Connect a jumper wire from the TPS initialization
pin #24 (violet wire) to the battery voltage pin (red
wire), or use jumper plug (SPX Part No.
KO3217-9, with blue jumper wire). See Figure
5B-9.
Figure 5B-8. Service Connector Plug, Metal-Cased
ECU Harness.
Figure 5B-9. Service Connector Plug, Plastic-
Cased ECU Harness.
8. Hold throttle against idle speed stop screw, turn
the ignition switch to “on” position (do not start
engine), and observe the Malfunction Indicator
Light (MIL).
a. The light should blink on/off quickly for
approximately 3 seconds and then go off and
stay off, indicating the initialization procedure
has been successful.