### Powertrain Control Module

#### REMOVAL AND INSTALLATION

NOTE: It is recommended that a grounding strap be worn when handling the ECM. A grounding strap will prevent a static electric discharge from damaging the component.

##### Except 300ZX

The ECM is located under the radio at the front of the console on most of the models. The console does not have to be removed to gain access to the control module. On the other models, the ECM is located between the front center console and is accessible through the passengers side.

1. Disconnect negative battery cable.
2. Remove the console side covers.
3. Remove electronic control module (ECM) bracket bolts.
4. Swing the ECM out from under the console.
5. Disconnect wiring harness by removing the connector hold down bolt.
6. Unplug the connector.
7. Remove the ECM.

   To install:

   WARNING
   Before installing a new ECM, perform input/output signal inspection at the ECM connector terminals to prevent damage to the new ECM.

8. Plug the wiring harness into the ECM.
9. On the Altima, Maxima and 240SX models, install the ECM into position, then tighten the securing bolt until the gap between the orange indicator disappears.
10. On the Sentra and 200SX models, tighten the hold down bolt until the red projector is in line with the connector face. Install the ECM into its proper location.
11. If necessary, reattach the ECM bracket bolts.
12. If removed, install the console side covers.
13. Reconnect the negative battery cable.

##### 300ZX

The electronic control module is located behind the glove compartment. The glove compartment must be removed to gain access to the ECM.

1. Disconnect negative battery cable.
2. Remove the glove box.
3. Remove electronic control module (ECM) bracket bolts.
4. Swing the ECM through the glove box opening.
5. Disconnect wiring harness by removing the connector hold down bolt.
6. Unplug the connector.
7. Remove the ECM.

   To install:

8. Plug the wiring harness into the ECM.
9. Tighten the hold down bolt until the red projection is in line with the connector face.
10. Reinstall the ECM in to the dashboard.
11. Reinstall the ECM bracket bolts.
12. Install the glove box assembly
13. Reconnect the negative battery cable.