5B.8
Section 5B
EFI Fuel System
Figure 5B-6. Service Connector Plug.
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 in wiring harness.
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
over 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 during this procedure, the “MIL” goes back into
blinking 4 consecutive blinks every 2 seconds, the
engine and Oxygen sensor have cooled down and
out of “closed-loop” operation, prohibiting the
learning from occurring. Repeat Steps 5-8.
b.
If during the procedure with the engine running, the
“MIL” stays “On” continuously, for more than 15
seconds, turn off the ignition. Then initiate the fault
code sequence by doing three consecutive key-on/
key-off cycles leaving the key “on” in the last
sequence, (each key-on/key-off sequence must be
less than 2.5 seconds long). The fault detected
must be corrected before the “auto-learn” function
of the ECU can be re-initiated. The PC-based
diagnostic tool and software may be used to read
out the fault code and assist with the
troubleshooting and repair.
Engine (Coolant) Temperature Sensor
Figure 5B-7. Engine (Coolant) Temperature Sensor.
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 a jumper connector plug (SPX Part
No. KO3217-9). See Figure 5B-6. 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.
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