The Mechanical is a generator-set controller. It is used on generator sets from Caterpillar, Cummins/Onan, Iveco/FPT and Weichai, including the 17 C4.4, C110D6, C135 D6 and C170 D6.
Used across brands: Caterpillar, Cummins/Onan, Iveco/FPT, Weichai
Also fitted to: Cummins/Onan HGJAA (Spec J-K) - 6.5 kW LPG, Cummins/Onan HGJAB (Spec J-L) - 5.5 kW Gasoline.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 12 | Over Voltage | A. Contact Local Dealer or Distributor | |
| 13 | Under Voltage | A. Reduce Load | |
| 14 | Over Frequency | A. Contact Local Dealer or Distributor | |
| 15 | Under Frequency | A. Reduce Load | |
| 19 | Governor Actuator | A. Contact Local Dealer or Distributor | |
| 2 | Indicates that the low oil pressure cutoff switch did not open. | A. Check Engine Oil Level 1. If the dipstick indicates oil is low, add oil. 2. If oil is above the full mark on dipstick, drain excess oil. | |
| 22 | Governor Actuator Overload | A. Reduce Load | |
| 27 | Voltage Sense | A. Contact Local Dealer or Distributor | |
| 29 | High Battery Voltage | A. Check Battery | |
| 3 | Service Check | ||
| 31 | Over Speed | A. Contact Local Dealer or Distributor | |
| 32 | Low Cranking Speed | A. Check Battery | |
| 35 | Control Card Failure | A. Contact Local Dealer or Distributor | |
| 36 | Engine Stopped | A. Check Fuel Level | |
| 37 | Invalid Generator Set Configuration | A. Contact Local Dealer or Distributor | |
| 38 | Over Current (Field Overload) | A. Reduce Load | |
| 4 | Indicates that cranking exceeded 30 seconds without engine starting. | A. Check Fuel Level 1. If fuel level is low, fill the fuel tank. NOTICE The generator set fuel pickup tube could be higher up in the fuel tank than the vehicle engine pickup. 2. Prime the engine fuel system by positioning the control switch to STOP/PRIME for 30 seconds. B. Check LPG Level Check and fill the LPG container, as necessary. NOTICE On cold days, the LPG container may have to be kept at least half full to provide the rate of vaporization necessary to keep up with the generator set fuel demand. C. Check Spark Plug(s) 1. Secure the spark plug lead(s) on the spark plug(s). 2. Replace the spark plug(s). D. Check Air Filter Element Replace the air filter if dirty. E. Replace Engine Oil Replace engine oil with oil of proper viscosity for the ambient temperature. | |
| 41 | Generator Rotor | A. Contact Local Dealer or Distributor | |
| 42 | Processor | A. Contact Local Dealer or Distributor | |
| 45 | Speed Sense | A. Contact Local Dealer or Distributor | |
| 47 | Ignition | A. Contact Local Dealer or Distributor | |
| 48 | Generator Field Sense | A. Contact Local Dealer or Distributor | |
| 52 | Fuel Injector | A. Contact Local Dealer or Distributor | |
| 54 | MAT Sender | A. Contact Local Dealer or Distributor | |
| 56 | MAP Sender | A. Contact Local Dealer or Distributor | |
| 57 | Over Prime | A. Check Control Switch | |
| Code 81 | Exhaust Gas Temperature Sensor Open | Contact Local Dealer or Distributor | |
| Code 82 | Exhaust Gas Temperature Sensor Shorted | Contact Local Dealer or Distributor |
| Symptom | Cause | Remedy |
|---|---|---|
| No AC Power—Generator Set Running, Status Light Flashing Rapidly | Generator set is operating in Engine Run Only (ERO) mode due to a faulty generator (see Section 4.3.5 on page 26) | Contact Local Dealer or Distributor |
| No Power—Generator Set Running, Status Light On | Line circuit breaker is OFF, or tripped due to short circuit or overload | A. Check Line Circuit Breakers 1. Turn on or reset the line circuit breaker on the generator set. 2. Turn on or reset the line circuit breaker on the main distribution panel in the vehicle. |
| Starter Engages-Disengages | Cranking voltage dips below 6 Volts | A. Use Vehicle to Start Generator Set Run the vehicle propulsion engine while trying to start the generator set—the battery charging alternator may be able to maintain starting voltage high enough to start the generator set. B. Check Battery 1. Clean and tighten the positive (+) and negative (–) battery cable connections at the battery and at the generator set. 2. Recharge or replace the battery. Refer to the battery manufacturer's recommendations. C. Change Battery Cables Increase battery cable size or run parallel cables. |
| Starting Batteries Run Down | Problem with batteries, connections, charging system, or parasitic loads | A. Check Battery 1. Clean and tighten the positive (+) and negative (–) battery cable connections at the battery and at the generator set. 2. Recharge or replace the battery. Refer to the battery manufacturer's recommendations. B. Battery Charging System Install or service a battery charging system in the vehicle. |
| Status Indicator Not Working | Faulty connections or no battery voltage | A. Check Other Control Switch B. Check Battery 1. Clean and tighten the positive (+) and negative (–) battery cable connections at the battery and at the generator set. 2. Recharge or replace the battery. Refer to the battery manufacturer's recommendations. |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.