Question about 2001 Pontiac Aztek

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Location of Engine Control Module for 2001 Pontiac Aztek

A number of engine related problems (non-fatal) have been ongoing for awhile. A mechanic said I should have the engine control module replaced. I have the module but where does it go? By the way, the ECM is not the same as the BCM.

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  • celowry Jan 22, 2009

    mrgreenz...



    I found the ECM on the driver's side of the engine compartment underneath the Coolant Overflow Reservoir in a large black plastic box.



    Thanks for the help.

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The ECU is the Electronic Control Moudule usually located in the Engine compartment. To the passenger side. The BCU id the Body Control Module located near the brake pedal under the dashboard.

Posted on Jan 22, 2009

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What are the probable causes of DTCs C0300, P0016, and P0344?


What's an SVG?

Scalable Vector Graphics, SVG for short, is an XML-based format for 2D images, allowing them to be viewed both static and interactive. This makes us able to provide you with a fully interactive image full of links to related diagrams and documents straight from the OEM.

Click on any link within the document and you will be able to narrow your focus on a particular component, or view a related portion of a wiring diagram. Even more, these documents are fully zoomable and printable.

Not able to view SVGs? Click here to download the Adobe SVG viewer P0016-CRANKSHAFT / CAMSHAFT TIMING MISALIGNMENT
139474.svg?manualid=1988%26oemid=9 139474.svg.png

For a complete wiring diagram Refer to the Wiring Information.

  1. When Monitored: Engine cranking and Engine running
  2. Set Condition: Powertrain Control Module detects an error when the camshaft position is out of phase with the crankshaft position. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes

ERRATIC CAM POSITION SENSOR SIGNAL CAMSHAFT POSITION SENSOR TONE WHEEL/PULSE RING ERRATIC CRANKSHAFT POSITION SENSOR SIGNAL CRANKSHAFT POSITION SENSOR TONE WHEEL/PULSE RING CAMSHAFT POSITION SENSOR CRANKSHAFT POSITION SENSOR

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

1.ACTIVE DTC
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. 1. With the scan tool clear the DTC(s). 2. Start the engine and run until operating temp is reached. (Closed Loop) 3. If the DTC does not reset it may be necessary to test drive the vehicle.

Does the P0016 return?

Yes

  1. Go To 2

No
  1. Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
  2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)



2.CHECKING THE CMP SIGNAL WITH A LAB SCOPE

139476.svg?manualid=1988%26oemid=9 139476.svg.png 1. With a lab scope, backprobe the (K44) CMP Signal circuit at the CMP Sensor harness connector. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. 2. Start the engine. 3. Observe the lab scope screen.

Are there any irregular or missing signals?

Yes

  1. Go To 3

No
  1. Go To 6



3.CMP WIRE HARNESS INSPECTION
1. Turn the ignition off. 2. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. 3. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. 4. Make sure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mounting bolt(s) are torqued to their proper specification. 5. Refer to any TSBs that may apply.

Were any of the above conditions present?

Yes

  1. Repair as necessary.
  2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)

No
  1. Go To 4



4.TONE WHEEL/PULSE RING INSPECTION
1. Remove the Camshaft Position Sensor. 2. Inspect the Tone Wheel/Pulse Ring for damage, foreign material, or excessive movement.

Were any problems found?

Yes

  1. Repair or replace the Tone Wheel/Pulse Ring as necessary.
  2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)

No
  1. Go To 5



5.CAMSHAFT POSITION SENSOR


If there are no possible causes remaining, view repair.

Repair

  1. Replace the Camshaft Position Sensor.
  2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)



6.ERRATIC CMP SIGNAL
1. Turn the ignition off. 2. Remove the lab scope probe. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. 3. Ignition on, engine not running. 4. With scan tool, erase DTCs. 5. Start the engine. 6. Gently tap on and wiggle the Cam Position Sensor. 7. Ignition on, engine not running. 8. Inspect the Sensor connector and harness connector, and inspect the PCM connector and harness connector for loose, bent, corroded, or pushed out pins/terminals. 9. Inspect the related wire harness and the splices in the CMP circuit.

Does the P0016 return?

Yes

  1. Repair the wiring/connector concerns as needed or replace the Camshaft Position Sensor.
  2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)

No
  1. Go To 7



7.CHECKING THE CKP SIGNAL WITH A LAB SCOPE

139478.svg?manualid=1988%26oemid=9 139478.svg.png 1. Turn the ignition off. 2. With a lab scope, backprobe the (K24) CKP Signal circuit at the CKP harness connector. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. 3. Start the engine. 4. Observe the lab scope screen.

Are there any irregular or missing signals?

Yes

  1. Go To 8

No
  1. Go To 10



8.CKP WIRE HARNESS INSPECTION
1. Turn the ignition off. 2. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. 3. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. 4. Make sure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mounting bolt(s) are torqued to their proper specification. 5. Refer to any TSBs that may apply.

Were any of the above conditions present?

Yes

  1. Repair as necessary.
  2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)

No
  1. Go To 9



9.TONE WHEEL/FLEX PLATE INSPECTION
1. Remove the Crankshaft Position Sensor. 2. Inspect the Tone Wheel/Flex Plate slots for damage, foreign material, or excessive movement.

Were any problems found?

Yes

  1. Repair or replace the Tone Wheel/Flex Plate as necessary.
  2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)

No
  1. Replace the Crankshaft Position Sensor.
  2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)



10.ERRATIC CKP SIGNAL


NOTE: The conditions that set this DTC are not present at this time. The following test may help in identifying the intermittent condition. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. 1. Start the engine. 2. Gently tap on and wiggle the Crank Position Sensor. 3. Turn the ignition off. 4. Inspect the Sensor connector and harness connector, and inspect the PCM connector and harness connector for loose, bent, corroded, or pushed out pins/terminals. 5. Inspect the related wire harness and the splices in the CKP circuits.

Were any problems found?

Yes

  1. Repair the wiring/connector concerns as needed or replace the Crankshaft Position Sensor.
  2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure)

No
  1. Test Complete.


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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exceptions to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

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The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.


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