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/
rotationwas 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 the jumper plug with the blue
jumper wire. If using the PC-based diagnostic
tool and software (see Section 2), 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 the jumper plug with the 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.
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