DELPHI EFI ECU continuously monitors engine operation against preset performance limits. If operation is outside limits, ECU activates MIL, if equipped, and stores a diagnostic code in its fault memory. If component or system returns to proper function, ECU will turn off MIL. If MIL stays illuminated, it warns customer a fault is currently happening, and dealer service is required. Upon receipt, dealer technician can access fault code(s) to help determine what portion of system is malfunctioning. Codes are accessed through key switch and displayed DVEOLQNVRUADVKHVRI0,/$FFHVVFRGHVDVIROORZV 1. Check that battery voltage is above 11 volts. 2. Start with key switch OFF. 3.
Turn key switch to ON and OFF, then ON and OFF, then ON, leaving it on in third sequence. Do not start engine. Time between sequences must be less than 2.5 seconds. 4. MIL will blink a series of times. Number of times MIL blinks represents a number in blink code. 5. A sequence of four digits make up a fault code. There is a one (1) second pause between blinks of a fault code. There is a three (3) second pause between separate fault codes. After fault code(s) are blinked a two digit 61 is blinked to indicate program has completed. a. It’s a good idea to write down codes as they appear, as they may not be in numerical sequence. b.
Code 61 will always be last code displayed, indicating end of code transmission. If code 61 appears immediately, no other fault codes are present. After problem has been corrected, fault codes may be cleared by following ECU Reset and TPS Learn Procedures. Diagnostic Fault Code Summary lists fault codes, and what they correspond to. Diagnostic Code Summary is a list of individual codes with an explanation of what triggers them, what symptoms might be expected, and probable causes. A MIL may not be provided with engine. If equipment manufacturer has not added a MIL to equipment, one can be added easily for quick diagnostics.
Main engine to vehicle connection will have a tan wire which is ground for MIL. Either incandescent or LED type bulbs can be used for MIL as long as they do not draw more than 0.1 amps. Bulb needs to be rated at 1.4 Watts or OHVVRUQHHGVWRKDYHDWRWDOUHVLVWDQFHRIџRU more. LEDs typically draw less than 0.03 amps. Attach +12 volts to positive terminal of bulb and attach ground terminal of bulb to tan wire. Diagnostic Code Summary Code 0031 Code 0032 Code 0107 40 KohlerEngines.com 24 690 01 Rev.
D 0230 Fuel Pump Module Circuit Low Voltage or Open 0232 Fuel Pump Module Circuit High Voltage 0336 Crankshaft Position Sensor Noisy Signal 0337 Crankshaft Position Sensor No Signal 0351 Cylinder 1 Ignition Coil Malfunction 0352 Cylinder 2 Ignition Coil Malfunction 0562 System Voltage Low 0563 System Voltage High 61 End of Code Transmission Component: Oxygen Sensor Heater Fault: O2S Heater Circuit High Voltage Condition: System voltage too high, shorted connection or faulty sensor. Conclusion: Oxygen Sensor Related Ɣ6HQVRUFRQQHFWRURUZLULQJSUREOHP Ɣ6HQVRUGDPDJHG Ɣ3LQFLUFXLWZLULQJRUFRQQHFWRUVDW%ODFN 7. ECU Related Ɣ(&8WRKDUQHVVFRQQHFWLRQSUREOHP Component:
Oxygen Sensor Heater Fault: O2S Heater Circuit Low Voltage Condition: System voltage too low, open connection or faulty sensor. Conclusion: Engine Wiring Harness Related Ɣ3LQFLUFXLWZLULQJRUFRQQHFWRUV ECU black pin 7 or broken wire. Oxygen Sensor Related Ɣ6HQVRUFRQQHFWRURUZLULQJSUREOHP Poor system ground from ECU to engine or battery to engine. Component: Manifold Absolute Pressure Sensor Fault: MAP Circuit Low Voltage or Open Condition: Intake manifold leak, open connection or faulty sensor. Conclusion: MAP Sensor Related Ɣ6HQVRUPDOIXQFWLRQ Ɣ9DFXXPOHDNVIURPORRVHPDQLIROGRU sensor.
Wire Harness Related Ɣ3RRUJURXQGLQJRURSHQFLUFXLW Ɣ:LUHKDUQHVVDQGFRQQHFWRUVORRVH damaged or corroded. Ɣ3LQFLUFXLWZLULQJRUFRQQHFWRUVDW%ODFN 10, 11 and 16. Bad TPS Learn.