HARNESS TESTING

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 harness connector from the TPS. Check for continuity of the ground circuit (terminal 4 on 2.4L engines, terminal 1 on 3.0L and 3.5L engines). If there is no continuity, repair or replace the harness between the following terminals:
   1. 2.4L engines: TPS terminal 4 and ECM terminals 14 and 24.
   2. 3.0L (12 valve) engines: TPS terminal 1 and ECM terminals 17 and 24.
   3. 3.0L (24 valve) and 3.5L engines: TPS terminal 1 and ECM terminal 72.

      Fig. 1: The TPS harness testing procedure — 2.4L engines

      Fig. 2: The TPS harness testing procedure — 3.0L (12 valve) engines

      Fig. 3: The TPS harness testing procedure — 3.0L (24 valve) and 3.5L engines

2. Unplug the ECM harness connector and all other control module connectors which use TPS output. Check for an open or short-circuit between the TPS and the ECM. If a short or open-circuit is found, repair or replace the harnesses between the following terminals (use these terminals also for the initial test):
   1. 2.4L engines: TPS terminal 2 and ECM terminals 19.
   2. 3.0L (12 valve) engines: TPS terminal 3 and 4 and ECM terminals 19 and 23, respectively.
   3. 3.0L (24 valve) and 3.5L engines: TPS terminal 3 and 4 and ECM terminal 61 and 64, respectively.
3. Unplug the harness connector from the TPS and turn the ignition switch to ON. Measure the power supply voltage of the TPS terminal 1 (2.4L) or terminal 4 (3.0L and 3.5L). If the voltage is not 4.8–5.2 volts, replace the ECM with a new unit.

   NOTE: Before replacing the ECM or other computer module, either check or have the component in question checked.