Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSNISSAN-DATSUN2004SENTRA L4-2.5L (QR25DE)REPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSENGINE CONTROLS - ECM PROGRAMMING INFORMATIONPROGRAMMING UNEXPECTEDLY TERMINATED
2004 Nissan-Datsun Sentra L4-2.5L (QR25DE)
Programming Unexpectedly Terminated
2004 Nissan-Datsun Sentra L4-2.5L (QR25DE)SECTION Programming Unexpectedly Terminated
PROGRAMMING UNEXPECTEDLY TERMINATED
(See step 27 under "Section 3: Perform ECM Reprogramming"):
^ The ECM has been permanently damaged and will require replacement.
^ Perform steps A through G below.
CAUTION:
Do not start the engine with the damaged ECM installed.
A. Turn the ignition "OFF", turn CONSULT-II "OFF", and DISCONNECT THE NEGATIVE TERMINAL OF THE VEHICLE BATTERY.
B. Attach the CONSULT-II print-out to the repair order for future reference.
C. Replace the damaged ECM.
D. Reconnect the negative battery cable.
E. If the vehicle is equipped with NATS:
^ Some models will require registration of the NATS keys.
^ See the appropriate TSB(s) or Service Manual (ESM) for NATS information and key registration procedures.
F. Perform IAVL (Idle Air Volume Learning). See the appropriate Service Manual (ESM) for this procedure.
G. Check the new ECM's current P/N.
1). Make sure it is the latest (newest) P/N.
2). See step 21 "Under Section 3: Perform ECM Reprogramming:".
NOTE:
^ A new ECM from the parts department may not have the newest program.
^ If needed, return to step 5 of this procedure and reprogram the new ECM with the latest available P/N. Be careful to follow each step exactly as written.
For Those Who Are Experienced With ECU Reprogramming
^ ASIST 8.0 and later has some new advanced functions for selecting and downloading reprogramming data that are not covered in these instructions.
^ For information on these new functions and other ASIST 8.0 enhancements, see the article-ASIST 8.0 Has Arrived" - in the July / August 2003 issue of TechTalk.
(See step 27 under "Section 3: Perform ECM Reprogramming"):
^ The ECM has been permanently damaged and will require replacement.
^ Perform steps A through G below.
CAUTION:
Do not start the engine with the damaged ECM installed.
A. Turn the ignition "OFF", turn CONSULT-II "OFF", and DISCONNECT THE NEGATIVE TERMINAL OF THE VEHICLE BATTERY.
B. Attach the CONSULT-II print-out to the repair order for future reference.
C. Replace the damaged ECM.
D. Reconnect the negative battery cable.
E. If the vehicle is equipped with NATS:
^ Some models will require registration of the NATS keys.
^ See the appropriate TSB(s) or Service Manual (ESM) for NATS information and key registration procedures.
F. Perform IAVL (Idle Air Volume Learning). See the appropriate Service Manual (ESM) for this procedure.
G. Check the new ECM's current P/N.
1). Make sure it is the latest (newest) P/N.
2). See step 21 "Under Section 3: Perform ECM Reprogramming:".
NOTE:
^ A new ECM from the parts department may not have the newest program.
^ If needed, return to step 5 of this procedure and reprogram the new ECM with the latest available P/N. Be careful to follow each step exactly as written.
For Those Who Are Experienced With ECU Reprogramming
^ ASIST 8.0 and later has some new advanced functions for selecting and downloading reprogramming data that are not covered in these instructions.
^ For information on these new functions and other ASIST 8.0 enhancements, see the article-ASIST 8.0 Has Arrived" - in the July / August 2003 issue of TechTalk.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.