Kohler Command CV730 User Manual download pdf (Page 79)

5B.12

Section 5B

EFI Fuel System

b. If the resistance is less than 1.0 M

ΩΩ

Ω, the

sensor is bad, replace it.

5. With the oxygen sensor disconnected and

engine not running, disconnect the main

harness connector from the ECU and set the

meter to the Rx1 scale. Check the circuit

continuity as follows:

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

for continuity from pin #15 of the ECU

connector (see page 5B.26) to the shell of the

oxygen sensor, and from pin #11 to the sensor

connector terminal of the main harness. Both

tests should indicate continuity.

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

for continuity from pin #19 of the ECU

connector (see page 5B.29) to the shell of the

oxygen sensor, and from pin #20 to the sensor

terminal of the main harness. Both tests should

indicate continuity.

a. If there is no continuity displayed in either

of the tests, check the harness circuit for

breaks or damage, and the connections for

poor contact, moisture, or corrosion. If no

continuity was found in the first test, also

check for a poor/broken ground path back

through the exhaust system, engine, and

mounting (sensor is grounded through its

shell).

b. If continuity is indicated, go to step 6.

6. With the key switch in the ‘‘on/run’’ position,

using a high impedance voltmeter, check the

voltage from the wiring harness oxygen sensor

connector to the engine ground location. Look

for a steady voltage from 350-550 mv

(0.35 - 0.55 v).

a. If the voltage reading is not as specified,

move the black voltmeter lead to the

negative post of the battery, to be certain of

a good ground. If the voltage is still not

correct, the ECU is probably bad.

b. If the voltage readings are correct, clear the

fault codes and run the engine to check if

any fault codes reappear.

To Replace Oxygen Sensor

1. Disconnect the oxygen sensor connector from

the wiring harness.

2. Loosen and remove the oxygen sensor from the

exhaust manifold/muffler assembly.

3. Apply anti-seize compound sparingly to

threads of new oxygen sensor, if none already

exists. DO NOT get any on the tip as it will

contaminate the sensor. Install sensor and

torque to 50-60 N·m (37-44 ft. lb.).

4. Reconnect the lead to the wiring harness

connector. Make sure it can not contact hot

surfaces, moving parts, etc.

5. Test run the engine.

Electrical Relay

Figure 5B-11. Electrical Relay.

General

The electrical relay is used to supply power to the

injectors, coil, and fuel pump. When the key switch is

turned “on” and all safety switch requirements met,

the relay provides 12 volts to the fuel pump circuit,

injectors, and ignition coils. The fuel pump circuit is

continuously grounded, so the pump is immediately

activated and pressurizes the system. Activation of the

ignition coils and fuel injectors is controlled by the

ECU, which grounds their respective ground circuits

at the proper times.

Service

A malfunctioning relay can result in starting or

operating difficulties. The relay and related wiring can

be tested as follows:

1. Disconnect the relay connector plug from the

relay.

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Kohler Command CV730 User Manual Page 79

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