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.
- Disconnect the CSPS harness connector (the same as the CPS) and turn the
ignition ON. Measure the power supply voltage of CPS harness terminal
3 (to ground). The voltage should be the battery voltage (i.e. 10–12
volts). If this is not the case, repair or replace the harness between CSPS
terminal 3 and the ignition switch.
- Turn the ignition switch OFF and check for continuity of
the ground circuit, which is CSPS harness terminal 2. If no continuity is
found, repair or replace the harness from CSPS terminal 2 to ground.
- Turn the ignition switch back ON and check the voltage
of the CSPS harness terminal 4 (output circuit). The voltage should be between
4.8–5.2 volts, if it is not, repair the harness from CSPS terminal 1
to ECM terminal 21.
- If the harness passed all of the tests, it is good.
- Plug all connectors back into their original components.
- Unplug the MFI relay harness connector and the distributor harness connector.
While touching the ohmmeter probes to both ends of the harness, check for
continuity between the CSPS (CPS/distributor) harness terminal 3 and the MFI
relay harness terminal 5. If no continuity is found, repair the harness between
these two terminals.
- Plug the MFI relay harness back in, and check for continuity in the ground
circuit, that is terminal 4 of the CSPS (distributor) harness to ground. If
no continuity exists, repair the harness between CSPS harness terminal 4 and
the ground.
- Unplug the ECM harness connector. Check for an open or short-circuit between
the CSPS harness terminal 1 and ECM harness terminal 22, and CSPS harness
terminal 2 and ECM harness terminal 21. If a short or open-circuit is found,
repair the harness between the two terminals.
- Turn the ignition switch ON. Check the output circuit voltage.
This is the CSPS harness terminal 2 to ground. If the output voltage is not
4.8–5.2V, replace the ECM with a new unit.
- Plug all connectors back into their original components.
- Unplug the MFI relay harness connector and the CSPS harness connector. Insert
the probes of the circuit tester into both ends of the harness. Check for
continuity between the CSPS harness terminal 3 and MFI relay terminal 3. If
there is no continuity, repair the harness between these two terminals.
- Plug the MFI relay connector back in. Check for continuity in the ground
circuit, which is the CSPS terminal 1 to ground. If no continuity in the circuit,
repair the harness between CSPS harness terminal 1 to ground.
- Unplug the ECM harness connector. Check the CSPS harness terminal 2 and
ECM terminal 69 for an open or short-circuit to ground. If there is a short
or open-circuit, repair the harness between the two terminals.
- Turn the ignition switch ON. Measure the applied voltage of
CSPS harness terminal 2 to ground. The voltage should be between 4.8–5.2
volts, if it is not, replace the ECM with a new unit. If the harness passed
all of the tests, the harness is good.
- Plug all connectors back into their original components.
| Fig. 1: The numbering of the terminals on the component
(sensor) side of the CSPS connector — 3.0L (24 valve)
and 3.5L engines
|
