Kohler Command CV730 User Manual download pdf (Page 107)

5B.40

Section 5B

EFI Fuel System

Flow Chart Diagnostic Aids

Diagnostic Aid #1 “SYSTEM POWER” (MIL does not

illuminate when key is turned “on”)

Possible causes:

1. Battery

2. Main system fuse

3. MIL light bulb burned out

4. MIL electrical circuit problem

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

circuits 19 and 84.

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

circuits 29 and 84.

5. Ignition switch

6. Permanent ECU power circuit problem

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

circuit 1.

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

circuit 1.

7. Switched ECU power circuit problem

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

circuit 2.

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

circuit 2.

8 ECU grounds

9. ECU

Diagnostic Aid #2 “FAULT CODES” (Refer to

detailed fault code listing before flow chart and

“servicing” information for the respective

components)

1. Code 21 - Engine Speed Synchronization

2. Code 22 - Throttle Position Sensor (TPS)

3. Code 23 - Engine Control Unit (ECU)

4. Code 31 - Oxygen Sensor

5. Code 32 - Oxygen Sensor

6. Code 33 - Fuel System (temporary adaptation

factor)

7. Code 34 - Fuel System (permanent adaptation

factor)

8. Code 42 - Engine (Oil) Temperature Sensor

9. Code 43 - TPS “Auto-Learn” Initialization

Function (Below Min. Limit), “32 Pin” (MSE 1.1)

Plastic-Cased ECU only.

10. Code 44 - TPS “Auto-Learn” Initialization

Function (Above Max. Limit), “32 Pin” (MSE 1.1)

Plastic-Cased ECU only.

11. Code 51 - Injector 1, “32 Pin” (MSE 1.1) Plastic-

Cased ECU only.

12. Code 52 - Injector 2, “32 Pin” (MSE 1.1) Plastic-

Cased ECU only.

13. Code 55 - MIL Light, “32 Pin” (MSE 1.1) Plastic-

Cased ECU only.

14. Code 56 - Pump Relay, “32 Pin” (MSE 1.1)

Plastic-Cased ECU only.

15. Code 61 - End of Fault/Blink Code Transmission

Diagnostic Aid #3 “RUN/ON” (MIL remains “on”

while engine is running)*

Possible causes:

1. Fault codes which turn on MIL when engine is

running.

a. Code 21 - Engine Speed Synchronization

b. Code 22 - Throttle Position Sensor (TPS)

c. Code 23 - Engine Control Unit (ECU)

d. Code 31 - Oxygen Sensor (shorted)

e. Code 34 - Fuel System (permanent adaptation

at limit)

f. Code 42 - Engine (Oil) Temperature Sensor

g. Code 43 - TPS “Auto-Learn” Initialization

Function (Below Min. Limit), “32 Pin”

(MSE 1.1) Plastic-Cased ECU only.

h. Code 44 - TPS “Auto-Learn” Initialization

Function (Above Max. Limit) “32 Pin”

(MSE 1.1) Plastic-Cased ECU only.

i. Code 51 - Injector 1, “32 Pin” (MSE 1.1)

Plastic-Cased ECU only.

j. Code 52 - Injector 2, “32 Pin” (MSE 1.1)

Plastic-Cased ECU only.

k. Code 55 - MIL Light, “32 Pin” (MSE 1.1)

Plastic-Cased ECU only.

l. Code 56 - Pump Relay, “32 Pin” (MSE 1.1)

Plastic-Cased ECU only.

2. MIL circuit grounded between light and ECU.

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

circuit 19.

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

circuit 29.

3. ECU

*NOTE: The MIL in Plastic-Cased ECU systems must

be a 1/4 watt incandescent lamp.

Diagnostic Aid #4 “SPEED SENSOR” (MIL does not

turn off during cranking)

Possible causes:

1. Speed sensor

2. Speed sensor circuit problem

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

circuits 9 and 10.

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

circuits 9 and 10.

3. Speed sensor/toothed wheel air gap

4. Toothed wheel

5. Flywheel key sheared

6. ECU

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Kohler Command CV730 User Manual Page 107

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