Kohler COMMAND CH18-745 User Manual download pdf (Page 69)

5B.10

Section 5B

EFI Fuel System

Figure 5B-10. Engine (Oil) Temperature Sensor.

General

The engine (oil) temperature sensor (Figure 5B-10) is

used by the system to help determine fuel

requirements for starting, (a cold engine needs more

fuel than one at or near operating temperature).

Mounted in the oil filter adapter housing, it has a

temperature-sensitive resistor that extends into the oil

flow. The resistance changes with oil temperature,

altering the voltage sent to the ECU. Using a table

stored in its memory, the ECU correlates the voltage

drop to a specific temperature. Using the fuel delivery

“maps”, the ECU then knows how much fuel is

required for starting at that temperature.

Service

The temperature sensor is a sealed, non-serviceable

assembly. A faulty sensor must be replaced. If a blink

code indicates a problem with the temperature sensor,

it can be tested as follows.

1. Remove the oil temperature sensor from the

adapter housing and cap or block the adapter

hole.

2. Wipe sensor clean and allow it to reach room

temperature (20°C, 68°F).

3. Unplug the main harness connector from the

ECU.

4. With the sensor connected, check the oil

temperature sensor circuit resistance. The value

should be 2375-2625

ΩΩ

Ω. See chart on pages

5B.28, 5B.31, or 5B.32.

“35 Pin” (MA 1.7) Metal-Cased ECU: Check

between the #14 and #27 pin terminals.

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

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 during this procedure, the “MIL” goes back

into blinking 4 consecutive blinks every 2

seconds, the engine and O

sensor have

cooled down and out of “closed-loop”

operation, prohibiting the learning from

occurring. Repeat Steps 6-9.

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 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 (Oil) Temperature Sensor

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Kohler COMMAND CH18-745 User Manual Page 69

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