Dodge Ram Truck 1500-2500-3500. Manual — part 237
5.9L DIESEL
1. Disconnect the battery negative cables.
2. Drain coolant from radiator and cylinder block
(Refer to 7 - COOLING - STANDARD PROCE-
DURE).
3. Unscrew the power cord retaining cap and discon-
nect cord from heater element.
4. Using a suitable size socket, loosen and remove
the block heater element.
INSTALLATION
GAS ENGINES
1. Clean and inspect the block heater hole.
2. Install the new O-ring seal(s) to heater.
3. Insert the block heater into cylinder block and posi-
tion the element properly.
4. With the heater fully seated, tighten center screw to
2 N·m (17 in. lbs.).
5. Fill the cooling system with the recommended cool-
ant. (Refer to 7 - COOLING - STANDARD PROCE-
DURE).
6. Start and warm the engine.
7. Check the block heater for leaks.
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ENGINE
DR/DH
5.9L DIESEL
1. Clean and inspect the threads in the cylinder block
and heater element.
2. Coat heater element threads with Mopar
T
Thread
Sealer with Teflon.
3. Screw block heater into cylinder block and tighten
to 75 N·m (55 ft. lbs.).
4. Connect block heater cord and tighten retaining
cap.
5. Fill cooling system with recommended coolant
(Refer to 7 - COOLING - STANDARD PROCE-
DURE).
6. Start and warm the engine.
7. Check block heater for leaks.
SENSOR-ENGINE COOLANT TEMPERATURE
DESCRIPTION
The Engine Coolant Temperature (ECT) sensor is used to sense engine coolant temperature. The sensor protrudes
into an engine water jacket.
The ECT sensor is a two-wire Negative Thermal Coefficient (NTC) sensor. Meaning, as engine coolant temperature
increases, resistance (voltage) in the sensor decreases. As temperature decreases, resistance (voltage) in the sen-
sor increases.
OPERATION
At key-on, the Powertrain Control Module (PCM) sends out a regulated 5 volt signal to the ECT sensor. The PCM
then monitors the signal as it passes through the ECT sensor to the sensor ground (sensor return).
When the engine is cold, the PCM will operate in Open Loop cycle. It will demand slightly richer air-fuel mixtures
and higher idle speeds. This is done until normal operating temperatures are reached.
The PCM uses inputs from the ECT sensor for the following calculations:
•
for engine coolant temperature gauge operation through CCD or PCI (J1850) communications
•
Injector pulse-width
•
Spark-advance curves
•
ASD relay shut-down times
•
Idle Air Control (IAC) motor key-on steps
•
Pulse-width prime-shot during cranking
•
O2 sensor closed loop times
•
Purge solenoid on/off times
•
Cooling fan control
•
Temperature gauge operation
•
A/C cutoff at high coolant temperatures
•
EGR solenoid on/off times (if equipped)
•
Leak Detection Pump operation (if equipped)
•
Radiator fan relay on/off times (if equipped)
•
Target idle speed
DR/DH
ENGINE
7 - 55
REMOVAL
3.7L V-6
The Engine Coolant Temperature (ECT) sensor on the
3.7L engine is installed into a water jacket at front of
intake manifold near rear of generator.
WARNING: HOT, PRESSURIZED COOLANT CAN
CAUSE INJURY BY SCALDING. COOLING SYSTEM
MUST BE PARTIALLY DRAINED BEFORE REMOV-
ING THE COOLANT TEMPERATURE SENSOR.
1. Partially drain the cooling system.
2. Disconnect the electrical connector from the sen-
sor.
3. Remove the sensor from the intake manifold.
4.7L V-8
WARNING: HOT, PRESSURIZED COOLANT CAN
CAUSE INJURY BY SCALDING. COOLING SYSTEM
MUST BE PARTIALLY DRAINED BEFORE REMOV-
ING THE ENGINE COOLANT TEMPERATURE (ECT)
SENSOR.
The Engine Coolant Temperature (ECT) sensor on the
4.7L V-8 engine is located near the front of the intake
manifold.
1. Partially drain the cooling system (Refer to 7 -
COOLING - STANDARD PROCEDURE).
2. Disconnect the electrical connector from the ECT
sensor.
3. Remove the sensor from the intake manifold.
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ENGINE
DR/DH
5.7L V-8
The Engine Coolant Temperature (ECT) sensor on the
5.7L engine is located under the air conditioning com-
pressor. It is installed into a water jacket at the front of
the cylinder block.
WARNING: HOT, PRESSURIZED COOLANT CAN
CAUSE INJURY BY SCALDING. COOLING SYSTEM
MUST BE PARTIALLY DRAINED BEFORE REMOV-
ING THE COOLANT TEMPERATURE SENSOR.
1. Partially drain the cooling system (Refer to 7 -
COOLING - STANDARD PROCEDURE).
2. Remove accessory drive belt (Refer to 7 - COOL-
ING/ACCESSORY
DRIVE/DRIVE
BELTS
-
REMOVAL).
3. Carefully unbolt air conditioning compressor from
front of engine. Do not disconnect any A/C hoses
from compressor. Temporarily support compressor
to gain access to ECT sensor. Refer to Heating
and Air Conditioning section for information.
4. Disconnect electrical connector from sensor.
5. Remove sensor from cylinder block.
DR/DH
ENGINE
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