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HARNESS TESTING

2.4L Engines

NOTE: The 1993–95, 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. 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.
  3. Plug all connectors back into their original components.

    Fig. 1: 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. 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.
  3. Plug all connectors back into their original components.
3.5L Engines
  1. Unplug the EGR temperature sensor harness connector. 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 terminal 72, otherwise the harness is good.
  2. Unplug the ECM module harness connector and check for an open or short-circuit to ground between the EGR temperature sensor terminal 2 and the ECM terminal 53. If there is a short or open-circuit, repair the harness between these two terminals.
  3. Plug the ECM harness connector back in 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, replace the ECM with a new unit.
  4. Plug all connectors back into their original components.

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