Kohler COMMAND CH18-745 User Manual download pdf (Page 67)

5B.8

Section 5B

EFI Fuel System

If the resistance values in steps 3, 4, and 5 are

within specifications, go to step 6.

If the resistance values are not within

specifications, or a momentary short or open

circuit was detected during rotation (step 4), the

TPS needs to be replaced, go to step 7.

6. Check the TPS circuits (input, ground) between

the TPS plug and the main harness connector for

continuity, damage, etc. See chart on pages

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

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

Circuits #12 and #27.

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

Circuits #8 and #4.

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

Circuits #8 and #4.

a. Repair or replace as required.

b. Turn the idle speed screw back in to its

original setting.

c. Reconnect connector plugs, start engine and

retest system operation.

7. Remove the two mounting screws from the TPS.

Save the screws for reuse. Remove and discard

the faulty TPS. Install the replacement TPS and

secure with the original mounting screws.

a. Reconnect both connector plugs.

b. Perform the appropriate “TPS Initialization

Procedure” integrating the new sensor to the

ECU.

TPS Initialization Procedure

For “35 Pin” (MA 1.7) Metal-Cased ECU and

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

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

engine (belts, pumps, electric PTO clutch,

alternator, rectifier-regulator, etc.).

3. Start the engine and allow it to warm up for 5-10

minutes, so oil temperature is above 55°C

(130°F).

4. Move the throttle control to the idle position and

allow engine to stabilize for a minimum of one

minute.

5. Install a heavy rubber band around the throttle

lever and the manifold boss, to firmly hold the

throttle against the idle stop. On some EFI

engines there is a dampening spring on the end

of the idle speed screw. The dampening spring (if

used) should be fully compressed and the tab on

the throttle lever in direct contact with the speed

screw. Adjust the idle speed to 1500 RPM, using

a tachometer.

6. Shut off engine.

7. Locate the service connector plug in the wiring

harness.

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

jumper wire from the TPS initialization pin #8

(gray wire) to the ground pin (black wire), or use

jumper plug (SPX Part No. KO3217-7, with red

jumper wire). See Figure 5B-8.

Throttle

Position

Closed

Full

Any

Between

Terminals

2 & 3

1 & 3

2 & 3

1 & 3

1 & 2

Resistance

Value (Ω)

800-1200

1800-3000

800-1200

1600-2500

Continuity

Yes

4. Leave the leads connected to the pin terminals as

described in step 3. Rotate the throttle shaft

slowly counterclockwise to the full throttle

position. Monitor the dial during rotation for

indication of any momentary short or open

circuits. Note the resistance at the full throttle

position. It should be 1800-3000

ΩΩ

Ω.

5. Disconnect the main wiring harness connector

from the TPS, leaving the TPS assembled to the

manifold. Refer to the chart below and perform

the resistance checks indicated between the

terminals in the TPS switch, with the throttle in the

positions specified.

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 217 218

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Kohler COMMAND CH18-745 User Manual Page 67

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