DM1 Gen Freq Fault

1. Visually inspect generator belt. 2. Validate AC frequency. 3. Validate generator. 7.2 DPF Troubleshooting 7.2.1 Possible DPF Failures Table 7–1 Possible DPF Failures Failure Cause Remedy Pressure indicated is persistently and unexpectedly low Connection or pipe is clogged, iced or has leaks Clean pipe and connection. Verify leak is tight Defective pressure sensor / snubber Using properly reduced air pressures, test sensor under controlled conditions Pressure indicated is high. Does not revert to zero at engine stop Connection or exhaust pressure pipe is clogged Clean pipe and connection. Verify leak is tight Defective pressure sensor Using properly reduced air pressures, test sensor under controlled conditions Black smoke emission visible and high backpressure Filter extremely overburdened Regenerate Filter on vehicle through manual regeneration Regeneration ineffective Clean Filter (external cleaning involving soot and ash removal involving heat cycling) Smoke emission is visible and low backpressure Filter element damaged Replace filter Canning bypass occurred Replace filter Noticeably Noisy Ignition frequency Flange leakage; crack in the filter inflow pie Whistling noise Leakage; crack in the filter inflow pipe Rattling hard during no load conditions Filter element loose V-Band coupling loose Low frequency throb Engine vibrations transmitted to DPF. Use bellows coupling Rapid increase in backpressure. No regeneration Temperature too low. Too much smoke. (Typically damaged Turbo charger, EGR) Check engine timing Inspect injection nozzles for deposits and verify injection pattern Back-pressure remains high despite active regeneration Burn temperature too low Data-log regeneration process Insufficient oxygen Measure oxygen content Regeneration time too short Ask manufacturer Soot forming graphite Raise regeneration temperature; contact manufacturer Backpressure rises despite regeneration Lubrication oil ash Change lubrication oil and repair engine Gypsum formation Select low sulfur diesel fuel and lubrication oil Ash from additives Lower additive concentration Mineral dusts Use Air filter with finer porosity, pre-filter and cyclone Air filter ejector should not blow ahead of DPF Engine abrasion Immediately repair engine Failure Cause Remedy Regeneration interval progressively decreasing Excessive ash deposition Clean filter Very high raw emissions Check engine Regeneration incomplete Verify regeneration Back-pressure not decreased after cleaning Coking in the pores Burn-off prior to cleaning Sticky deposits Burn-off deposits Ash sintering Replace DPF Sparks in the exhaust gas flow Filter overburdened, damaged Replace filter Soot deposit at filter exit Replace filter Extremely high regeneration temperature Improve regeneration Flames in the exhaust gas flow Massive deposits at the clean end through excessive soot burden. Or damage and much HC. High lube oil consumption Replace filter element Verify regeneration Verify engine raw emission. Check injection nozzles. Temperature after filter unusually high Uncontrolled regeneration with too much soot Verify backpressure monitoring Too rapid regeneration Verify HC raw emission If back-pressure is OK, then problem is not DPF Decreased engine power DPF backpressure Check DPF backpressure IF backpressure is OK, then problem is not DPF Higher fuel consumption DPF backpressure Check DPF backpressure IF backpressure is OK, then problem is not DPF Higher Water temperature DPF backpressure Check DPF backpressure Adequate ventilation, radiator performance? IF back-pressure is OK, then problem is not DPF Long white smoke phase Steam formation due to condensation in the cold DPF system Engine not warming up during idle Verify fuel sulfur content Otherwise not serious Blue or gray-white smoke High oil consumption in engine Check engine Soot deposition in the exhaust tailpipe Filter damage has begun Measure opacity Table 7–1 Possible DPF Failures (continued) 7.2.2 Validating Temperature Sensor The temperature sensor is a resistive based thermocouple sensor. Table 7–2 lists the designed resistive feedback based on the exposed temperature. The DCP/DPF controller assumes for logic reasons a temp value of 750°C when the sensor is physically disconnected. The sensor is rated up to a max Temp of 850°C / 1562°F. Table 7–2 Temperature Sensor Resistance Ohm Ω Temp F° Temp C° 209.15 50 10 210.67 53.6 12 212.20 57.2 14 213.72 60.8 16 215.24 64.4 18 216.77 68 20 218.29 71.6 22 219.81 75.2 24 221.33 78.8 26 222.85 82.4 28 224.37 86 30 225.88 89.6 32 227.40 93.2 34 228.91 96.8 36 230.43 100.4 38 231.94 104 40 233.45 107.6 42 234.96 111.2 44 236.47 114.8 46 237.98 118.4 48 239.49 122 50 276.90 212 100 349.96 392 200 420.68 572 300 489.06 752 400 555.10 932 500 587.24 1022 550 618.80 1112 600 7.2.3 Validating Pressure Sensor The pressure sensor returns an output voltage (Vout) based on the observed pressure. The sensor requires a 5VDC constant input and permanent ground connection. Figure 7.1 Pressure Sensor Key Sensor features: • Supply Voltage: 5.0 +/- 0.25VDC; do not exceed 5mA • Vout= 0.5 VDC @ Null Pressure and at 25°C • Vout > 4.8 VDC @ Loss of Ground • Vout < 0.2 VDC @ Loss of Power input • Operating range: 0-5 psi (0 - 340 mbar) 7.2.4 Resistance Between Pins, DPF Heater/Exhaust Heater Verify that the heater is good: With the heater COLD, disconnect the heater plug from the DPF controller and check the resistance between pins on the heater side of the connector. Table 7–3 Heater Resistance • If readings are not within above mentioned specification, remove the DPF assembly cover and check that the wires from the connector to the heater are not broken. • If the heater indicates an open, short, or short to ground, replace the heater cone. • Verify DPF controller supplies power to the heater - Measure the voltage of the DPF controller at the 110V output plug (connected to the DPF heater). Measure Resistance between Heater PINS Expected Values Explanation 1 to 2 Less than 1 Q Ground to Ground 1 to 3 Between 7-9 Q Ground to Heater #1 1 to 4 Between 4-5 Q Ground to Heater #2 2 to 4 Between 4-5 Q Ground to Heater #2 2 to 3 Between 7-9 Q Ground to Heater #1 3 to 4 Between 11-13 Q Heater #1 to Heater #2