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5B.9
Section 5B
EFI Fuel System
5B
11. Reconnect the battery cable and all external loads.
Remove the rubber band from the throttle lever.
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
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.
5. Remove the jumper wire or plug from the service
connector plug.
6. Run the engine at full throttle (above 3000 RPM),
to warm up the engine and initiate O
2
sensor
function in “closed-loop” operation.
7. Watch the “MIL”. When the light starts blinking
rapidly, (5 blinks per second), move the throttle
lever to the low idle speed position. Check and
adjust the idle speed to 1500 RPM, using a
tachometer. The lamp should continue to blink
rapidly for another 30 seconds before switching
to a slow blink.
8. When the “MIL” blinks slowly, do not do
anything but wait until the “MIL” shuts off. This
indicates that this procedure has been completed
successfully.
9. Shut off the engine. If the learn procedure was
successfully completed, the external loads
removed/disconnected in Step 2 may be
reconnected.
If the procedure was unsuccessful see Steps a.
and b. following.
a. If the “MIL” goes back to blinking 4
consecutive blinks every 2 seconds during the
procedure, the engine and O
2
sensor have
cooled down and gone out of “closed-loop”
operation, prohibiting the learning from
occurring. Repeat Steps 6-9.
b. If the “MIL” stays “on” continuously for more
than 15 seconds during the procedure, there is
probably a fault code present, turn off the
ignition. Then initiate the fault code sequence,
by turning the key switch on-off-on-off-on,
leaving the key “on” in the last sequence (each
key on/off sequence must be less than 2.5
seconds long). The fault detected must be
corrected before the “auto-learn” function can
be re-initiated. The PC-based diagnostic
software may be used to read out the fault
code and assist with troubleshooting and
repair.
Engine (Oil) Temperature Sensor
Figure 5B-8. Engine (Oil) Temperature Sensor.