Service Codes, Cummins EngineGeneral InformationThe engine protection system monitors critical temperatures and pressures and records diagnostic errors whenever abnormal operating conditions occur. If such a condition demands a restriction of engine power, the operator is warned by an indicator light in the corner post (see "Warning Devices and Monitors"). Depending on the relevant malfunction, engine power and speed will gradually be reduced. The engine is shut off by the engine protection system. The service codes are stored in the electronic control unit. Engine stop and engine warning light can be used to call up these service codes. Service CodeA service code is a 3-digit figure (from 111 to 551) which is determined by the engine stop light. For each digit of the figure, the operator has to count how many times the engine stop light flashes. |
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Calling Up Service Codes
Move service code switch to center position. Turn on ignition. NOTE: If no service code is stored, engine stop and engine warning lights will light up and stay on. If there is an error, the engine warning light will flash. After 1 or 2 seconds the engine warning light wil go out and the engine stop light will flash. The engine stop light will flash to indicate the value of the first digit (e.g. 1 flash indicates a value of 100). After 1 or 2 seconds the engine stop light will flash to indicate the value of the second digit (e.g. 5 flashes indicate a value of 50). After 1 or 2 seconds the engine stop light will flash to indicate the value of the third digit (e.g. 4 flashes indicate a value of 4). The engine warning light will flash once to indicate the end of the first service code ("154" in our example). Press the side of the service code switch with the symbol on it for at least 2 seconds to proceed to the next service code. NOTE: If no further service code is stored, the first service code will be displayed once more. If a second service code is stored, the value of the three digits will be indicated as described above. As soon as all service codes have been called up, switch off ignition. |
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Abbreviations
ECU - E lectronic C ontrol U nit
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| Service Code | Indicator Light | Cause | Effect (only when service code is active) |
|---|---|---|---|
| 111 | Stop | Internal ECU error related to memory hardware failure or internal microprocessor cummunication failure. | Engine will not start. |
| 115 | Stop | No engine speed signal detected at pins 1 and 15 and pins 11 and 14 (X97) of wiring harness (A). | Engine will die and will not start. |
| 121 | Warning | No engine speed signal detected at one pair of pins, either pins 1 and 15 or 11 and 14 (X97) of wiring harness (A). | No effect on performance |
| 122 | Warning | High voltage detected at pin 26 (X97) (charge air sensor) of wiring harness (A). | Derate in power output of the engine. |
| 123 | Warning | Low voltage detected at pin 26 (X97) (charge air sensor) of wiring harness (A). | Derate in power output of the engine. |
| 131 | Stop | High voltage detected at pin 11 (X98) (speed potentiometer) of wiring harness (B). | Severe derate (power and speed). Enough power to get home with throttle at maximum speed position. |
| 132 | Stop | Low voltage detected at pin 11 (X98) (speed potentiometer) of wiring harness (B). | Severe derate (power and speed). Enough power to get home with throttle at maximum speed position. |
| 135 | Warning | High voltage detected at pin 7 (X97) (oil pressure) of wiring harness (A). | No engine protection for oil pressure. |
| 141 | Warning | Low voltage detected at pin 7 (X97) (oil pressure) of wiring harness (A). | No engine protection for oil pressure. |
| 143 | Engine protection | Voltage at signal pin 24 (X97) (oil pressure) of wiring harness (A) indicates low oil pressure. | Progressive power and speed derate after indicator light comes on. If engine protection shut-off function is activated, engine will be shut off 30 seconds after engine protection light comes on. |
| 144 | Warning | High voltage detected at pin 17 (X97) (coolant temperature) of wiring harness (A). | White smoke is possible. Fan will stay ON if controlled by ECU. No engine protection for coolant temperature. |
| 145 | Warning | Low voltage detected at pin 17 (X97) (coolant temperature) of wiring harness (A). | White smoke is possible. Fan will stay ON if controlled by ECU. No engine protection for coolant temperature. |
| 151 | Engine protection | Voltage at pin 17 (X97) (coolant temperature) of wiring harness (A) indicates a coolant temperature above 104°C (220°F). | Progressive power and speed derate after indicator light comes on. If engine protection shut-off function is activated, engine will be shut off 30 seconds after engine protection light comes on. |
| 153 | Warning | High voltage detected at pin 25 (X97) (inlet manifold temperature) of wiring harness (A). | White smoke is possible. Fan will stay ON if controlled by ECU. No engine protection for coolant temperature. |
| 154 | Warning | Low voltage detected at pin 25 (X97) (inlet manifold temperature) of wiring harness (A). | White smoke is possible. Fan will stay ON if controlled by ECU. No engine protection for coolant temperature. |
| 155 | Engine protection | Voltage at pin 25 (X97) (inlet manifold temperature) of wiring harness (A) indicates an inlet manifold temperature above 93.3°C (200°F). | Progressive power and speed derate after indicator light comes on. If engine protection shut-off function is activated, engine will be shut off 30 seconds after engine protection light comes on. |
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| Service Code | Indicator Light | Cause | Effect (only when service code is active) |
|---|---|---|---|
| 212 | Warning | High voltage detected at pin 6 (X97) (oil temperature) of wiring harness (A) | No engine protection for oil temperature. |
| 213 | Warning | Low voltage detected at pin 6 (X97) (oil temperature) of wiring harness (A). | No engine protection for oil temperature. |
| 214 | Engine protection | Voltage at pin 6 (X97) (oil temperature sending unit) of wiring harness (A) indicates an oil temperature above 124°C (255°F). | Progressive power and speed derate after indicator light comes on. If engine protection shut-off function is activated, engine will be shut off 30 seconds after engine protection light comes on. |
| 221 | Warning | High voltage detected at pin 27 (X97) (sending unit for ambient air pressure) of wiring harness (A). | Power decreases by 15%. |
| 222 | Warning | Low voltage detected at pin 27 (X97) (sending unit for ambient air pressure) of wiring harness (A). | Power decreases by 15%. |
| 234 | Stop | Engine speed signal at pins 1 and 35 and/or 11 and 14 of wiring harness (A) indicates an engine speed above 2630 rpm. | Fuel shut-off valve closed until engine speed drops to 2000 rpm. |
| 235 | Engine protection | Not used | |
| 241 | Warning | Not used | |
| 242 | Warning | Not used | |
| 243 | Warning | Not used | |
| 245 | Warning | Not used | |
| 254 | Stop | Low voltage detected at pin 16 (fuel shut-off valve) of wiring harness (C). This indicates an ECU current draw of more than 2 amps or faulty ECU power supply. | ECU turns off power supply to fuel shut-off valve. The engine will die. |
| 255 | Warning | External power supply detected at pin 16 (fuel shut-off valve) of wiring harness (C). | Fuel shut-off valve will not close. |
| 311 | Warning | Nozzle control valve, cylinder 1, wiring harness (C): Current detected at pin 10 (with power supply to pin 1 off). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
| 312 | Warning | Nozzle control valve, cylinder 5, wiring harness (C): Current detected at pin 2 (with power supply to pin 11 off). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
| 313 | Warning | Nozzle control valve, cylinder 3, wiring harness (C): Current detected at pin 12 (with power supply to pin 3 off). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
| 314 | Warning | Nozzle control valve, cylinder 6, wiring harness (C): Current detected at pin 4 (with power supply to pin 13 off). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
| 315 | Warning | Nozzle control valve, cylinder 2, wiring harness (C): Current detected at pin 14 (with power supply to pin 5 off). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
| 321 | Warning | Nozzle control valve, cylinder 4, wiring harness (C): Current detected at pin 6 (with power supply to pin 15 off). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
| 322 | Warning | Nozzle control valve, cylinder 1, wiring harness (C): No current detected at pin 10 (with power supply to pin 1 on). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
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| Service Code | Indicator Light | Cause | Effect (only when service code is active) |
|---|---|---|---|
| 323 | Warning | Nozzle control valve, cylinder 5, wiring harness (C): No current detected at pin 2 (with power supply to pin 11 on). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
| 324 | Warning | Nozzle control valve, cylinder 3, wiring harness (C): No current detected at pin 12 (with power supply to pin 3 on). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
| 325 | Warning | Nozzle control valve, cylinder 6, wiring harness (C): No current detected at pin 4 (with power supply to pin 13 on). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
| 331 | Warning | Nozzle control valve, cylinder 2, wiring harness (C): No current detected at pin 14 (with power supply to pin 5 on). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
| 332 | Warning | Nozzle control valve, cylinder 4, wiring harness (C): No current detected at pin 6 (with power supply to pin 15 on). | Speed derate to 1400 to 1600 rpm. Current to nozzle control valve is shut off. |
| 343 | Warning | Microprocessor communication error inside ECU. | No effect on performance |
| 352 | Warning | Low voltage detected at pins 2 and 12 of wiring harness (A). This indicates ECU current draw of more than 0.3 amps or faulty ECU power supply. | Engine derates due to lack of air. Simultaneously error codes 123, 141, 145, 154, 213 and 222 are entered. |
| 415 | Warning | Voltage signal at pin 7 (oil pressure sending unit) of wiring harness (A) indicates low oil pressure. | Progressive power and speed derate after indicator light comes on. If engine protection shut-off function is activated, engine will be shut off 30 seconds after engine protection light comes on. |
| 422 | Warning | Not used | |
| 431 | Warning | No voltage detected simultaneously at pin 6 (idle off) and at pin 9 (idle on) of wiring harness (B), | No effect on performance |
| 432 | Warning | Voltage detected at pin 6 (idle on) of wiring harness (B) while voltage at pin 11 (engine speed) does not indicate idle position. OR: voltage deteced at pin 9 (idle off) of wiring harness (B) while voltage at pin 11 (engine speed) indicates idle position. | Power and engine speed derate. OR: engine can run at a constant speed only. |
| 433 | Warning | Voltage signal at pin 26 (charge pressure sending unit) of wiring harness (A) indicates high charge pressure while other engine characteristics indicate low charge pressure. | Derate to "no air" setting |
| 434 | Warning | Battery voltage drops below 6.2 volts for a fraction of a second. OR: ECU was not allowed to power down correctly (retain battery supply voltage for three seconds after shutdown) | Possibly no noticeable effects on performance. OR: possibility of engine dying. OR: problems when starting the engine. |
| 441 | Warning | Battery voltage below normal operating level. | Possibly no noticeable effects on performance. OR: engine runs irregularly. |
| 442 | Warning | Battery voltage above normal operating level. | No effect on performance. |
| 551 | Warning | Voltage detected simultaneously at pin 6 (idle off) and pin 9 (idle on) of wiring harness (B). | No effect on performance. |
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