Kohler COMMAND CH18-745 User Manual download pdf (Page 100)

5B.41

Section 5B

EFI Fuel System

5B

Code: 51 "32 Pin" (MSE 1.1) Plastic-

Cased ECU only.

Source: Injector #1 circuit open, shorted to

ground, or shorted to battery.

Explanation: Injector #1 is not functioning because

the circuit is open, shorted to ground,

or shorted to battery.

Expected Engine

Response: Engine will run very poorly with only

one cylinder functioning.

Possible Causes:

1. Injector Related

a. Injector coil shorted or opened.

2. Engine Wiring Harness Related

a. Broken or shorted wire in harness.

ECU pin 14 to injector pin 2. ECU pin 28 to

fuel pump relay pin 86. Note: after key-off then

key-on code 56 would be set also. Fuel pump

relay pin 87 to injector pin 1.

b. Open main fuse F1.

3. Fuel Pump Relay Related

a. Bad fuel pump relay.

Primary side functional but pin 30 to pin 87

remains open. Primary side pin 85 to pin 86 is

either open, or shorted during engine

operation. Note: after key-off then key-on

code 56 would be set also.

4. ECU Related

a. Circuit controlling injector #1 damaged.

b. Circuit controlling fuel pump relay damaged.

Code: 52 "32 Pin" (MSE 1.1) Plastic-

Cased ECU only.

Source: Injector #2 circuit open, shorted to

ground, or shorted to battery.

Explanation: Injector #2 is not functioning because

the circuit is open, shorted to ground,

or shorted to battery.

Expected Engine

Response: Engine will run very poorly with only

one cylinder functioning.

Possible Causes:

1. Injector Related

a. Injector coil shorted or opened.

2. Engine Wiring Harness Related

a. Broken or shorted wire in harness. ECU pin 15

to injector pin 2.ECU pin 28 to fuel pump relay

pin 86. Note: after key-off then key-on code 56

would be set also. Fuel pump relay pin 87 to

injector pin 1.

b. Opened main fuse F1.

3. Fuel Pump Relay Related

a. Bad fuel pump relay.

Primary side functional, but pin 30 to pin 87

remains open.

Primary side pin 85 to pin 86 is open or

shorted during engine operation. Note: after

key-off then key-on code 56 would be set also.

4. ECU Related

a. Circuit controlling injector #2 damaged.

b. Circuit controlling fuel pump relay damaged.

Code: 55 "32 Pin" (MSE 1.1) Plastic-

Cased ECU only.

Source: MIL (Diagnostic lamp) circuit open,

shorted to ground, or shorted to

battery.

Explanation: MIL is not functioning because the

circuit is open, shorted to ground, or

shorted to battery.

Expected Engine

Response: Engine will run normally if no other

errors are present.

Possible Causes:

1. MIL (diagnostic lamp) Related

a. MIL element opened or element shorted to

ground.

b. Lamp missing.

2. Engine Wiring Harness Related

a. Broken or shorted wire in harness.

ECU pin 29 to lamp open or shorted.

3. Vehicle Wiring Harness Related

a. Broken or shorted wire in harness.

Power lead to MIL open or shorted.

4. ECU Related

a. Circuit controlling lamp damaged.

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