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First, the detection of Cummins diesel engine coolant temperature sensor
The Cummins temperature sensor is located on the front right side of the cylinder head, near the thermostat. Its function is to adjust the amount of starting fuel, control the timing of fuel supply and engine protection.
The working range is 40 ～ 120 ℃. The sensor failure will cause the engine speed to decrease, the power to decrease, and the starting to be difficult. If the engine protection function is turned on, the engine will stop.
Temperature sensor maintenance method: The temperature sensor used by Cummins engine is a two-wire thermal sensor. Two-wire means that the sensor has two electrical wires provided by the ECM and a return line; the thermal type means that the resistance of the resistance varies with It decreases with the increase of temperature; under normal circumstances, the resistance value is 500-40 kfl. Therefore, you can use a multimeter to detect the resistance value of the temperature sensor wiring plug, and compare it with the normal parameter value, that is, determine whether the temperature sensor is working properly. Table 1 lists the normal parameter ranges of the temperature sensors, which are applicable to all other Cummins system temperature sensors.
Cummins QSK23 / 60/78 diesel engine fault code 144 145,
Cause: The voltage detected on the coolant temperature signal stylus of the engine harness is less than 0.21 VDC.
Consequences: White smoke may be emitted. No engine coolant temperature protection. Centinel ™ system is disabled.
The ECM uses a coolant temperature sensor to monitor the engine coolant temperature. The ECM uses coolant temperature for engine protection systems, timing, and fuel control. The ECM monitors the voltage on pin # 22. The ECM expects voltages to vary from 0.21 to 4.95 VDC. If the voltage is below 0.21 VDC for more than 2 seconds, the ECM will record fault code 145. A short circuit to ground from the power supply or return wire or a ground failure within the sensor can cause the voltage on stylus 22 to be less than 0.21 VDC.
For QSK series engines, the coolant temperature sensor is located on the thermostat housing side in most applications.
The resistance value of the sensor changes with temperature. If the sensor is functioning properly, the observed reading should be compared with the data in the table below.
Cummins diesel fuel temperature sensor
The fuel temperature sensor is installed above the fuel filter housing, and its function is; ECM uses the signal of this sensor to control the fuel heater and protect the engine. The working range is 40 ～ 140 ℃. The sensor failure will affect the engine performance.
Fault Code 261, Fuel Temperature-Engine Protection
Cause: High coolant temperature was detected. The voltage signal on the 26th fuel temperature signal stylus of the engine harness indicates that the fuel temperature is higher than 71 ° C [160 ° F].
Consequences: Some time after the alarm, the calibration setting power gradually decreases, the speed decreases, and the engine stops.
The ECM uses a fuel temperature sensor to monitor the fuel temperature. The ECM monitors the voltage on stylus 26 and converts it to a temperature value. Fuel temperature values are used by the ECM for engine protection systems.
Parts position QSK engine, fuel temperature sensor is located on the left side of the control valve body, above the fuel cutoff valve. For QSK45 and QSK60 engines, the fuel temperature sensor is located on the right side of the electronic control valve assembly between the fuel rail and the timing pressure sensor. For QSK78 engines, the fuel temperature sensor is located on the right side of the electronic control valve assembly between the fuel rail and the timing pressure sensor.
The resistance value of the sensor changes with temperature. If the sensor is functioning properly, the observed reading should be compared with the data in the table below.
3. Cummins diesel fuel rail pressure sensor
Installed in the high-pressure fuel common rail, its function is: ECM uses the sensor signal to determine the fuel pressure in the fuel rail, and at the same time uses it to calculate the fuel supply, the working range is 0 ~ 1500 Ba. Defective sensors can cause engine power to drop, speed to drop, or even stop.
The maintenance method is: most of the pressure sensors used on Cummins engine are piezoelectric crystal type. The piezoelectric crystal type sensor uses a piezoelectric crystal inside to sense the pressure change. When the pressure changes, the pressure difference acting on the piezoelectric crystal causes the piezoelectric crystal to output a signal voltage. The fuel rail pressure sensor is this type. It uses a three-wire type. Two power lines provide a working voltage of 5v to the sensor, and one signal line provides the pressure signal voltage to the ECM, as shown in Figure 1.
According to the difference of the reference pressure when the pressure sensor measures the pressure, the pressure sensor can be divided into a relative pressure sensor and an absolute pressure sensor. The reference pressure when the relative pressure sensor measures pressure is atmospheric pressure, so the measured value when it measures atmospheric pressure. . The reference pressure when the absolute pressure sensor measures pressure is vacuum, and the measured pressure value is absolute pressure.
The rail pressure sensor provides a signal to the ECM through the engine harness. The ECM uses the rail pressure signal to monitor the amount of fuel delivered from the control valve body to the injector's metering cavity. The component position, the fuel rail pressure sensor is located on the lower right side of the control valve body.
Pressure sensor output voltage:
Diagnostic methods Section TF — Fault code diagnosis and troubleshooting (ch19-fc111) Electronic control module (ECM) microprocessor (ch19-fc112) Timing fuel flow mismatch (ch19-fc113) Timing actuator circuit (ch19- fc115) Engine speed sensor circuit (ch19-fc116) Timing pressure sensor circuit (ch19-fc117) Timing pressure sensor circuit (ch19-fc118) Fuel pump pressure sensor circuit (ch19-fc119) Fuel pump pressure sensor circuit (ch19-fc121 ) Engine speed sensor circuit (ch19-fc122) Intake manifold pressure sensor circuit (ch19-fc123) Intake manifold pressure sensor circuit (ch19-fc131) Throttle position sensor: CELECT type accelerator pedal (ch19-fc132) Throttle position Sensor: CELECT ™ accelerator pedal (ch19-fc133) Remote accelerator position sensor: CELECT ™ accelerator pedal (ch19-fc134) Remote accelerator position sensor: CELECT ™ accelerator pedal (ch19-fc135) Oil pressure sensor circuit (ch19-fc141) ) Oil pressure sensor circuit (ch19-fc143) Oil pressure-engine protection (ch19-fc144) Coolant temperature sensor circuit (ch19-fc145) Coolant temperature sensor circuit (ch1 9-fc147) Throttle frequency circuit (ch19-fc148) Throttle frequency circuit (ch19-fc151) Coolant temperature-engine protection (ch19-fc153) Intake manifold temperature sensor circuit (ch19-fc154) Intake manifold temperature sensor circuit (ch19-fc155) Intake manifold temperature sensor-Engine protection (ch19-fc219) Replenishment tank oil level low fault (ch19-fc221) Atmospheric pressure sensor circuit (ch19-fc222) Atmospheric pressure sensor circuit (ch19-fc223) Solenoid valve circuit (ch19-fc225) Supplementary solenoid valve circuit (ch19-fc231) Coolant pressure sensor circuit (ch19-fc232) Coolant pressure sensor circuit (ch19-fc233) Coolant pressure-engine protection (ch19-fc234) Engine overspeed (ch19-fc235) Engine coolant level-engine protection (ch19-fc237) Multi-machine synchronization (ch19-fc252) Oil level sensor circuit (ch19-fc253) Oil level-engine protection (ch19-fc254) Fuel cut electromagnetic Valve power circuit (ch19-fc259) Fuel shutoff valve stuck in open position (ch19-fc261) Fuel temperature-engine protection (ch19-fc263) Fuel temperature sensor circuit (ch19-fc265) Fuel temperature sensor circuit (ch19-fc292) O EM Temperature-Engine Protection (ch19-fc293) OEM Temperature Sensor Circuit (ch19-fc294) OEM Temperature Sensor Circuit (ch19-fc296) OEM Pressure-Engine Protection (ch19-fc297) OEM Pressure Sensor Circuit (ch19-fc298) OEM Pressure Sensor Circuit (ch19-fc299) Non-key switch thermal shutdown (ch19-fc316) Fuel pump actuator circuit (ch19-fc318) Fuel pump fuel flow mismatch (ch19-fc343) Electronic control module (ECM) internal communication error (ch19- fc346) Power failure of electronic control module (ECM) (ch19-fc349) Throttle frequency circuit (ch19-fc384) Ether injection circuit (ch19-fc415) Oil pressure — engine protection (ch19-fc422) Coolant level sensor circuit (ch19 -fc423) Error of timing pressure sensor in normal working range (ch19-fc426) J1939 Data communication interface without communication (ch19-fc427) J1939 Data communication interface communication is slow (ch19-fc431) Idle effective switch circuit (ch19-fc432) CELECT ™ accelerator pedal (ch19-fc441) Non-switching battery power circuit (ch19-fc442) Non-switching battery power circuit (ch19-fc451) Fuel rail pressure sensor circuit (ch19-fc452) Fuel rail pressure sensor circuit (ch19-fc455) Rail actuator circuit (ch19-fc467) Timing current deviation (ch19-fc468) Rail current offset error (ch19-fc471) Very low oil level-Engine protection (ch19-fc487) Ether system Drain (ch19-fc489) Auxiliary speed input error (ch19-fc497) Multi-machine synchronous switch error (ch19-fc498) Oil level sensor circuit (ch19-fc499) Oil level sensor circuit (ch19-fc514) Rail fuel supply Flow mismatch (ch19-fc527) Solenoid valve A failure (ch19-fc529) Solenoid valve B failure (ch19-fc551) Idle effective switch circuit (ch19-fc553) Rail pressure exceeds limit (ch19-fc554) Rail pressure is normal Error within working range (ch19-fc555) Purge pressure — Engine protection (ch19-fc611) Key switch thermal shutdown (ch19-fc649) Arrival of maintenance interval (ch19-fc719) Purge gas pressure sensor circuit (ch19-fc729) Air pressure sensor circuit (ch19-fc753) Engine speed sensor circuit (ch19-fc777) Turbocharger intake temperature-engine protection (ch19-fcmfc00) Multiple fault codes A in the engine harness (ch19-fcmfc01) In the engine harness Multiple fault code B (ch19-fcmfc02) engines Multiple fault codes C (ch19-fcmfc03) in the harness Multiple fault codes D (ch19-fcmfc04) in the engine harness Multiple fault codes E (ch19-fcmfc05) in the engine harness Multiple fault codes F in the engine harness (ch19-fcmfc06) Multiple fault codes G in the engine harness (ch19-fcmfc07) Multiple fault codes H in the engine harness (ch19-fcmfc08) Multiple fault codes I in the engine harness I (ch19-fcmfc09) In the engine harness Multiple fault codes J (ch19-fcmfc10) multiple fault codes K in the engine harness (ch19-fcmfc11) multiple fault codes L in the engine harness