Location of the PCM?

Tiny
DTS GHOST
  • MEMBER
  • 2007 CADILLAC DEVILLE DTS
  • 4.6L
  • V8
  • 4WD
  • 98,000 MILES
I cannot find the cars computer to clean the connectors or check it out, after disconnecting battery of course.
Wednesday, July 4th, 2018 AT 11:28 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening.

It is under the air filter box assembly.

Roy

Engine Control Module Replacement

Notice:
* Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, Jumper cables, etc.) In order to prevent internal control module damage.

* Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery.

* In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board.

* Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module.

* The replacement control module must be programmed.

Important: It is necessary to record the remaining engine oil life. If the replacement engine control module (ECM) is not programed with the remaining engine oil life, the engine oil life will default to 100 percent. If the replacement ECM is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5 000 km (3,000 mi) from the last oil change.

Important: It is necessary to record the remaining automatic transaxle fluid life. If the replacement ECM is not programed with the remaining transaxle fluid life, the transaxle fluid life will default to 100 percent. If the replacement ECM is not programmed with the remaining transaxle fluid life, the transaxle fluid will need to be changed at 83 000 km (50,000 mi) from the last transaxle fluid change.

Removal Procedure

imageZoom/Print

1. Using a scan tool, retrieve the percentage of remaining engine oil and automatic transaxle fluid life. Record the remaining engine oil and transaxle fluid life.
2. Ensure that the ignition is in the OFF position.
3. Disconnect the negative battery cable.
4. Disconnect the engine harness electrical connector from the mass air flow/intake air temperature (MAF/IAT) sensor.

ImageZoom/Print

5. Disconnect the positive crankcase ventilation (PCV) fresh air tube quick connect fitting from the air duct.

ImageZoom/Print

6. Disconnect the secondary air injection (AIR) pump inlet tube quick connect fitting from the air cleaner upper housing.

ImageZoom/Print

7. Loosen the air cleaner outlet duct clamp at the throttle body.
8. Remove the air cleaner outlet duct from the throttle body.

ImageZoom/Print

9. Disengage the lower housing clips (1).
10. Disengage the upper housing front tabs from the lower housing.
11. Remove the air cleaner upper housing.

ImageZoom/Print

12. Disengage the engine harness electrical connector lever locks at the ECM.
13. Remove the engine harness electrical connectors from the ECM.
14. Remove the ECM from the air cleaner lower housing.
Was this
answer
helpful?
Yes
No
+1
Wednesday, July 4th, 2018 AT 2:25 PM

Please login or register to post a reply.

Sponsored links