Chrysler RAM50/D50/Arrow 1979-1993 Repair Guide

EGR Temperature Sensor

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OPERATION



See Figure 1

The EGR temperature sensor converts changes in the EGR gas temperature downstream of the EGR valve to voltages and inputs these signals to the ECM. The ECM uses these pulses to keep track of the condition of the EGR system. When the signal is judged to be abnormal, the engine warning lamp lights up to inform the driver.

The EGR temperature sensor terminal voltage changes with the EGR gas temperature, dropping as the EGR gas temperature rises.

The EGR temperature sensor is located on the top right-hand (driver's) side of the engine intake manifold plenum.



Click image to see an enlarged view

Fig. Fig. 1: The location of the EGR temperature sensor and its harness connector-all models similar

HARNESS TESTING



2.4L Engines

See Figure 2

The 1993, rear-wheel drive 2.4L (California) Pick-ups have the same engine controls as the 3.0L engines. All other 2.4L engines are listed as 2.4L engines.

  1. Unplug the EGR temperature sensor connector and turn the ignition switch ON . Measure the power supply between the EGR temperature sensor harness connector terminal 2 and a ground. If the voltage measured is not between 4.3-4.7, repair the harness between the terminal 2 and the ECM terminal 15.
  2.  
  3. Turn the ignition switch OFF. Check for continuity from the EGR temperature sensor connector terminal 1 to ground. If no continuity is found, repair the harness between the EGR temperature sensor harness connector terminal 1 to the ECM terminals 14 and 24, otherwise the harness is good.
  4.  
  5. Plug all connectors back into their original components.
  6.  



Click image to see an enlarged view

Fig. Fig. 2: The harness connector for the EGR temperature sensor-all models similar

3.0L Engines

Only the California models of the 3.0L engines have the EGR temperature sensor.

  1. Unplug the EGR temperature sensor connector and turn the ignition switch ON . Measure the power supply between the EGR temperature sensor harness connector terminal 1 and a ground. If the voltage measured is not between 4.3-4.7, repair the harness between the terminal 1 and the ECM terminal 15.
  2.  
  3. Turn the ignition switch OFF. Check for continuity from the EGR temperature sensor connector terminal 2 to ground. If no continuity is found, repair the harness between the EGR temperature sensor harness connector terminal 2 to the ECM terminals 17 and 24, otherwise the harness is good.
  4.  
  5. Plug all connectors back into their original components.
  6.  

COMPONENT TESTING



See Figure 3

  1. Remove the EGR temperature sensor.
  2.  
  3. Place the EGR temperature sensor in water, and then measure the resistance value between terminals 1 and 2 while increasing the temperature of the water.
  4.  



Click image to see an enlarged view

Fig. Fig. 3: Measure the resistance between terminals 1 and 2 while increasing the water's temperature

  1. At 122°F (50°C), the resistance should be 60-83 kilohms.
  2.  
  3. At 212°F (100°C), the resistance should be 11-14 kilohms.
  4.  

  1. Replace the EGR temperature sensor if there is a significant deviation from the standard value.
  2.  
  3. Install the EGR temperature sensor and tighten to 7.3-8.6 ft. lbs. (10-12 Nm).
  4.  
  5. Plug all connectors back into their original components.
  6.  

REMOVAL & INSTALLATION



To remove the EGR temperature sensor, unplug the EGR temperature sensor harness connector and, using a wrench, loosen the EGR temperature sensor from its boss. Make sure the wrench is correctly applied to the faces of the EGR temperature sensor. Remove the sensor along with its harness.

To replace, thread the harness back into its original position. Apply some thread sealant to the threads and screw the sensor into the mounting boss. Make certain not to crossthread the sensor. Tighten the sensor to 7-9 ft. lbs. (10-12 Nm).

 
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