Pinout Values and Diagnostic Parameters

Fig. 8 Powertrain Control Module Location:

1. Unplug the GRAY 40-way connector from the Powertrain Control Module (PCM).
2. Remove both steering wheel speed control switches and disconnect the wire connectors.

Fig. 9 PCM 40-Way Connectors:

a. Using an ohmmeter, check for continuity between cavity 41 of the PCM connector and cavity 1 of each speed control switch connector.
b. If no continuity, repair as necessary.
c. Using an ohmmeter, check for continuity between cavity 41 of the PCM connector and ground.
d. If continuity, repair as necessary.
e. If no continuity, perform the Switch Test.
f. Plug GRAY 40 way connector into PCM.
g. Plug switch connectors back into switches.
3. Unplug speed control servo electrical connector. (4) Place ignition switch in the ON position and turn on the speed control system, for the following tests.
a. Using a voltmeter, measure voltage from cavity 3 of servo connector to ground. Voltmeter should read ignition voltage. If voltage is low, skip to Step 7.
b. Turn speed control and ignition switch OFF. Using an ohmmeter, place positive lead on pin 3 and negative lead on pin 4 on the speed control servo. Check continuity from pin 3 to pin 4.
c. If no continuity, replace the speed control servo. If continuity is greater than 49 ohms, clean terminals.
d. Using an ohmmeter, place positive lead on pin 3 and negative lead on pin 2 on the speed control servo. Check continuity from pin 3 to pill 2.
e. If no continuity, replace the speed control servo. If continuity is greater than 49 ohms, clean terminals.
f. Using an ohmmeter, place positive lead on pin 3 and negative lead on pin 1 on the speed control servo. Check continuity from pin 3 to pin 1.
g. If no continuity, replace the speed control servo. If continuity is greater than 49 ohms, clean terminals.
h. Using an ohmmeter at the servo connector, place positive lead on cavity 4 and negative lead on ground. Check continuity from cavity 4 to ground. If no continuity, repair open circuit.
i. Unplug 2 40-way PCM connectors.
j. Using an ohmmeter, check continuity from cavity 1 of servo connector to cavity 56 (2.4, 3.3, 3.8L) or cavity 78 (3.0L) on PCM connector. If no continuity, repair open circuit.
k. Using an ohmmeter, check continuity from cavity 1 of servo connector to ground. If continuity; repair as necessary.
l. If continuity is OK, check continuity from cavity 2 of servo connector to cavity 80 of PCM connector. If no continuity, repair open circuit.
m. Using an ohmmeter, check continuity from cavity 2 of servo connector to ground. If continuity, repair as necessary.
n. Using an ohmmeter, check continuity from cavity 1 of servo connector to cavity 2 of servo connector. If continuity, repair as necessary.
o. Reconnect the 4 way connector to servo.
5. Using an ohmmeter, check continuity from cavity 62 of the PCM connector to ground. If continuity is OK with brake pedal in unpressed position, proceed to Step 6.
a. If no continuity, perform the Stop Lamp switch test. Replace or adjust switch as required.
b. If switch passes test, check continuity from cavity 62 of the PCM connector to cavity 1 of the stop lamp switch connector. Repair open circuit as required.
c. If continuity is OK between cavity 62 and cavity 1, repair open circuit between cavity 2 of the stop lamp switch connector and ground.
6. Using an ohmmeter, check continuity from cavity 76 on PCM connector to ground with the transmission in drive. If continuity, test TRS/ Park-Neutral switch and switch wiring.
7. Turn speed control and ignition switch OFF.
8. Unplug the BLACK 40-way connector from the Powertrain Control Module (PCM).
9. Using an ohmmeter, check continuity from cavity 3 of servo connector to cavity 5 on the PCM connector.
a. If no continuity, skip to Step 10.
b. If continuity is OK, check continuity from pin 5 of PCM connector to ground. If continuity, repair short to ground. If no continuity, replace PCM. Jump to Step 11.
10. Remove stop lamp switch and conduct Stop Lamp Switch Test. If test fails, adjust or replace as necessary.
a. If switch passes, measure continuity from cavity 4 of stop lamp switch connector to cavity 3 of servo connector. Repair open circuit if necessary.
b. If continuity is OK, measure continuity from cavity 3 of stop lamp switch to cavity 5 of PCM connector. Repair open circuit as necessary.
11. Install PCM connectors onto PCM and speed control servo connector to servo.