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.
- Since the BPS is located in the volume air flow sensor box, the harness
connector (HC) to this box will be the wiring tested throughout this procedure.
Unplug the volume air flow sensor HC from the volume air flow sensor assembly
box.
- Check terminal 5 of the HC for continuity to ground. If there is no continuity
in the circuit, repair or replace the harness between terminal 5 of the HC
to terminals 14 and 24 of the ECM.
- Turn the ignition switch to ON and measure the power supply
voltage of terminal 1 of the HC. If the voltage is not between 4.8–5.2
volts, repair or replace the harness between terminal 1 (HC) and terminals
13 and 23 (ECM).
| Fig. 1: The BPS harness testing procedure — 3.0L
(24 valve) and 3.5L engines
|
- Turn the ignition switch OFF and unplug the ECM harness
connector. Check for an open or short-circuit to ground, between terminal
16 (ECM) and terminal 2 (HC) for 2.4L and 3.0L (12 valve) engines, terminal
61 (ECM) and terminal 2 (HC) for 3.0L (24 valve) and 3.5L engines. For all
engines except for the 2.4L, check also terminal 23 (ECM) and terminal 1 (HC)
for 3.0L (12 valve) engines, terminal 65 (ECM) and terminal 1 (HC) for 3.0L
(24 valve) and 3.5L engines. If there is a short or open-circuit, repair or
replace the harness between these terminals, otherwise the harness is good.
