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.
- Unplug the wiring harness connector from the side of the Volume air flow
sensor box, this harness connector also services the IAT sensor.
- Attach the ohmmeter to the harness side connector on terminal 5 and check
for continuity of the ground circuit. If there is any continuity, proceed
to the next step, otherwise repair or replace the harness between terminal
5 and the ECM terminals 14 and 24 for 2.4L engines, terminals 17 and 24 for
3.0L (12 valve) engines, and terminal 72 for 3.0L (24 valve) and 3.5L engines.
- This step is NOT for 2.4L engines, all other engines should do this step,
however. Disconnect the ECM harness connector. Check for an open or short-circuit
between the IAT terminal 6 and the ECM terminal 8 for 3.0L (12 valve) engines,
or ECM terminal 52 for 3.0L (24 valve) and 3.5L engines. If there is a short
or open-circuit, repair or replace the harness between these two terminals.
After this test, plug the ECM harness connector back in.
- Turn the ignition switch to ON and measure the power supply
voltage from terminal 6 to ground. The voltage should be 4.5–4.9 volts,
if this is the voltage measured then the IAT is OK. If the voltage is anything
other than the specified voltage, repair or replace the harness between the
IAT terminal 6 and the ECM terminal 8.
- Plug all connectors back into place.
