Kohler command pro ECH749 Service Manual page 53

Code 0122
Component: Throttle Position Sensor (TPS)
Fault: TPS Circuit Low Voltage or Open
Condition: Open connection, broken wire or faulty
sensor.
Conclusion: TPS Related
● TPS bad or worn internally.
Engine Wiring Harness Related
● Broken or shorted wire in harness.
ECU Black pin 10 to TPS pin 1.
ECU Black pin 12 to TPS pin 3.
ECU Black pin 16 to TPS pin 2.
Throttle Body Related
● Throttle shaft inside TPS worn, broken,
or damaged.
● Throttle plate loose or misaligned.
● Throttle plate bent or damaged
allowing extra airfl ow past, or restricting
movement.
ECU Related
● Circuit providing voltage or ground to
TPS damaged.
● TPS signal input circuit damaged.
Code 0123
Component: Throttle Position Sensor (TPS)
Fault: TPS Circuit High Voltage
Condition: Shorted connection or faulty sensor.
Conclusion: TPS Sensor Related
● Sensor connector or wiring.
● Sensor output affected or disrupted by
dirt, grease, oil, wear.
● Sensor loose on throttle body manifold.
Throttle Body Related
● Throttle shaft or bearings worn/
damaged.
Engine Wiring Harness Related
● ECU pins Black 10, 12 and 16
damaged (wiring, connectors).
● ECU pins Black 10, 12 and 16 routed
near noisy electrical signal (coils,
alternator).
● Intermittent 5 volt source from ECU
(pin Black 16).
● ECU-to-harness connection problem.
24 690 01 Rev. K
Code 0131
Component: Oxygen Sensor
Fault:
Condition:
Conclusion: Oxygen Sensor Related
Code 0132
Component: Oxygen Sensor
Fault:
Condition:
Conclusion: Oxygen Sensor Related
KohlerEngines.com
EFI SYSTEM-ECH
O2S 1 Circuit Low Voltage
Open connection, broken wire or faulty
sensor.
● Sensor connector or wiring problem.
● Sensor contaminated, corroded or
damaged.
● Poor ground path.
● Pin circuit wiring or connectors.
ECU Black pin 10 or 17.
TPS Learn Procedure Incorrect
● Lean condition (check oxygen sensor
signal with VOA and see Oxygen
Sensor).
Engine wiring harness related such as a
cut wire, broken or pinched.
O2S 1 Circuit High Voltage
Shorted connection or faulty sensor.
● Sensor connector or wiring problem.
● Sensor contaminated or damaged.
● Poor ground path.
● Pin circuit wiring or connectors.
ECU Black pin 10 or Black pin 17.
Engine Wiring Harness Related
● Difference in voltage between sensed
voltage and actual sensor voltage.
● Short in wire harness.
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