Join Date: Jun 2010
Location: 15 Miles NorthWest of Russell,KS
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AutoEnginuity Coolant Temperature Question on 2000 7.3
I have been fitting a problem with tuning lately on my 7.3. It idles real rough and i have tunes from Jonathan at beans and cass 160cc single w 100 over. Jonathan told me to check my EOT and ECT with the AE to make sure that couldn't be causing a problem. When i did the Engine Oil Temp was 73F cold on a day that the ambient temperature was around 70F but the Engine Coolant Temp was 302F. I figured this had to be the problem but the Gauge on the dash was at C and warmed up as the truck did. My question is i have heard talk of 2 ECT sensors on the OBS but what about the 99-03. If i unplug the ECT in the water pump the dash goes to C but the AE still says 53F. The AE gave me all sorts of crazy readings. First 302 then went to 0 and climbed steadily to 274 degrees while driving. Is there 2 ECT's one for the gauge and one for the PCM on a 2000 7.3 6speed manual. If there is does anybody know where the one that feeds the PCM is found? Anybody else use AE to look at their ECT's? Can you just not trust AE for this parameter. This is something i found searching around that
This is listed for 03
Engine Coolant Temperature Sensor (ECT) - With Manual Transmission Only
The Engine Coolant Sensor is used as the primary input to the Electronic Control System to enable adaptive cooling. This provides a means of providing adequate cooling in severe engine temperature conditions. When ECT is greater than 107°C (225°F) , the fueling rate of the engine is modified to provide cooling protection and prevent engine damage due to overheating.
Engine Coolant Temperature Sensor - With Manual Transmission Only (front of engine)
The Engine Coolant Temperature (ECT) sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to temperature.
If the PCM receives a high engine temperature signal from the ECT, it will adjust fueling rates to protect the engine from damage due to overheating.
Engine Oil Temperature Sensor
The Engine Oil Temperature sensor is a thermistor mounted to the oil reservoir whose resistance decreases as engine oil temperature increases. The Engine Oil Temperature signal is used by the PCM to calculate fuel quantity, injection timing, glow plug operation and exhaust back-pressure.
At low ambient air temperatures, and oil temperature below 50°C (122°F) , low idle is increased to a maximum of 1300 rpm to increase engine warm-up. Fuel quantity and timing is controlled throughout the total operating range to provide adequate torque and power.
An Engine Oil Temperature signal detected out of range, high or low, by the PCM will cause the PCM to assume an engine oil temperature of 20°C (68°F) for starting purposes and 100°C (212°F) for operating purposes. The Malfunction Indicator Lamp in the instrument cluster will be illuminated as long as the fault condition exists.