Скачать или смотреть BMW N47D20 DIAGNOSTIC of Coolant Temperature Sensor

Diagnosing the Coolant Temperature Sensor (ECT) on a BMW with the N47D20 engine is vital, as this engine relies heavily on accurate temperature readings for fuel trim adjustment and, most importantly, DPF (Diesel Particulate Filter) regeneration.
​Here is the professional guide to diagnosing the sensor using computer diagnostics and electrical testing.
​1. Software Diagnostics (ISTA/D or INPA)
​Using BMW-specific software is the most reliable method to see what the DDE (Digital Diesel Electronics) "sees."
​ISTA/D (Rheingold):
​Navigate to Vehicle management - Service function - Drive - Diesel Electronics - Coolant temperature sensor.
​Run the Test Plan. The software will compare the sensor's voltage to the temperature value and tell you if it is within the plausible range.
​INPA:
​Select your model (e.g., E90, E60, F30) - Engine - DDE 7.x for N47.
​Go to Status (F5) - Analog Values (F2) - Measured Values Block 1.
​Check for Plausibility: If the engine is cold (sitting overnight), the coolant temp should be within 2-3^{\circ}\text{C} of the ambient air and intake air temperature.
​2. Live Data Analysis (Hidden Menu)
​If you don't have a laptop connected, use the instrument cluster's hidden menu to monitor the sensor while driving:
​Hold the Trip Reset button until the menu appears.
​Unlock the menu (Position 19) by entering the sum of the last 5 digits of your VIN.
​Navigate to Menu 07.00 (KTMP-MOM).
​Normal Operating Temp: For an N47, this should be between 88^{\circ}\text{C} and 105^{\circ}\text{C}. If it stays below 75^{\circ}\text{C} during a highway drive, your thermostat is likely stuck open, not necessarily a sensor fault.
​3. Electrical Testing (Multimeter)
​The N47 coolant sensor is a Negative Temperature Coefficient (NTC) thermistor. As temperature rises, resistance drops.
​Reference Resistance Values:
| Temperature | Approximate Resistance |
| :--- | :--- |
| 20^{\circ}\text{C} (68^{\circ}\text{F}) | 2500 - 3000\ \Omega |
| 50^{\circ}\text{C} (122^{\circ}\text{F}) | 700 - 900\ \Omega |
| 80^{\circ}\text{C} (176^{\circ}\text{F}) | 300 - 350\ \Omega |
| 100^{\circ}\text{C} (212^{\circ}\text{F}) | 150 - 200\ \Omega |
​Check Voltage: Unplug the sensor connector. With the ignition ON, you should measure exactly 5\text{V} across the two pins of the harness connector. If there is no voltage, there is a wiring break or a DDE issue.
​4. Common Fault Codes
​When diagnosing with a computer, look for these specific BMW codes:
​3EED: Coolant temperature sensor, signal (P0115)
​3EEE: Coolant temperature sensor, plausibility (P0116)
​4CA0: Oil pressure switch/Coolant temperature sensor comparison (on some N47 variants)
​Summary Checklist
​Fixed Value (-40°C or +120°C): Usually indicates a disconnected plug or a dead short in the wiring.
​Slow Warm-up: Usually a mechanical thermostat issue, not the sensor.
​DPF Issues: If your DPF is clogging, always check the coolant temp first. If the sensor reports less than 75^{\circ}\text{C}, the car will never regenerate the filter.

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