Kohler COMMAND CH18-745 User Manual download pdf (Page 66)

5B.7

Section 5B

EFI Fuel System

Mounted on the throttle body/intake manifold and

operated directly off the end of the throttle shaft, the

TPS works like a rheostat, varying the voltage signal to

the ECU in direct correlation to the angle of the throttle

plate. This signal, along with the other sensor signals,

is processed by the ECU and compared to the internal

preprogrammed maps to determine the required fuel

and ignition settings for the amount of load.

The correct position of the TPS is established and set

at the factory. Do not loosen the TPS or alter the

mounting position unless absolutely required by fault

code diagnosis or throttle shaft service. If the TPS is

loosened or repositioned the appropriate “TPS

Initialization Procedure” (pages 5B.8-5B.10) must be

performed to reestablish the baseline relationship

between the ECU and the TPS.

Service

The TPS is a sealed, non-serviceable assembly. If

diagnosis indicates a bad sensor, complete

replacement is necessary. If a blink code indicates a

problem with the TPS, it can be tested as follows.

1. Counting the number of turns, back out the idle

speed adjusting screw (counterclockwise) until

the throttle plates can be closed completely.

2. Disconnect the main harness connector from the

ECU, but leave the TPS mounted to the throttle

body/manifold.

3. Connect the ohmmeter leads as follows:

(See chart on pages 5B.28, 5B.31, or 5B.32).

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

(positive) ohmmeter lead to #12 pin terminal, and

Black (negative) ohmmeter lead to #27 pin

terminal.

“24 Pin” (MSE 1.0) Plastic-Cased ECU: Red

(positive) ohmmeter lead to #8 pin terminal, and

Black (negative) ohmmeter lead to #4 pin

terminal.

“32 Pin” (MSE 1.1) Plastic-Cased ECU: Red

(positive) ohmmeter lead to #8 pin terminal, and

Black (negative) ohmmeter lead to #4 pin

terminal.

Hold the throttle closed and check the resistance. It

should be 800-1200

ΩΩ

Ω.

Figure 5B-6. Throttle Position Sensor Details.

General

The throttle position sensor (TPS) is used to indicate

throttle plate angle to the ECU. Since the throttle (by

way of the governor) reacts to engine load, the angle

of the throttle plate is directly proportional to the load

on the engine.

1. Throttle Valve Shaft

2. Resistor Track

3. Wiper Arm w/Wiper

4. Electrical Connection

Throttle Position Sensor (TPS)

Figure 5B-7. TPS Location.

Mounted Throttle

Position Sensor

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 217 218

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Kohler COMMAND CH18-745 User Manual Page 66

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