Powertrain Control Module (PCM) OPERATION REMOVAL and INSTALLATION?

OPERATION

The Powertrain Control Module (PCM) performs many functions on your car. The module accepts information from various engine sensors and computes the required fuel flow rate necessary to maintain the correct amount of air/fuel ratio throughout the entire engine operational range.

Based on the information that is received and programmed into the PCM's memory, the PCM generates output signals to control relays, actuators and solenoids. The PCM also sends out a command to the fuel injectors that meters the appropriate quantity of fuel. The module automatically senses and compensates for any changes in altitude when driving your vehicle.

REMOVAL & INSTALLATION

See Figure 1

Fig. Fig. 1: Typical PCM module

491-92 Models

See Figure 2

1. Disconnect the negative battery cable.
2. Remove the inside, lower cowl trim panel from the passenger's side of the vehicle to expose the PCM.
3. Disengage the wiring harness connector from the PCM by loosening the connector retaining bolt, then pulling the connector from the module.
4. Remove the PCM from the bracket by pulling the unit downward.

Fig. Fig. 2: View of the right-hand kick panel PCM mounting for 491-92 models

To install:

5. Install the PCM in the mounting bracket.
6. Attach the wiring harness connector to the module, then tighten the connector retaining bolt.
7. Install the right cowl trim panel.
8. Connect the negative battery cable.

493-99 Models

See Figures 3 and 4

The module is mounted under the hood on the firewall. On 493-94 models, it is mounted low on the firewall, near the left-hand fender (drivers side). On 495-99 models, it is mounted high on the firewall offset to the right-hand side of center.

Fig. Fig. 3: Exploded view of the firewall PCM mounting for 493-94 models

Fig. Fig. 4: Exploded view of the firewall PCM mounting for 495-99 models

1. Disconnect the negative battery cable.
2. Disengage the wiring harness connector from the PCM by loosening the connector retaining bolt, then pulling the connector from the module.
3. Remove the two nuts and the PCM cover.
4. Remove the PCM from the bracket by pulling the unit outward.

To install:

5. Install the PCM in the mounting bracket.
6. Install the PCM cover and tighten the two nuts.
7. Attach the wiring harness connector to the module, then tighten the connector retaining bolt.
8. Connect the negative battery cable.

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