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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSNISSAN-DATSUN2004SENTRA L4-2.5L (QR25DE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSDIAGNOSTIC PROCEDURESCONTROL UNIT (RAM), CONTROL UNIT (ROM)
2004 Nissan-Datsun Sentra L4-2.5L (QR25DE)
Control Unit (RAM), Control Unit (ROM)
2004 Nissan-Datsun Sentra L4-2.5L (QR25DE)SECTION Control Unit (RAM), Control Unit (ROM)
DTC CONTROL UNIT (RAM), CONTROL UNIT (ROM)
Description
The TCM consists of a microcomputer and connectors for signal input and output and for power supply. The unit controls the A/T.
On Board Diagnosis Logic
Diagnostic trouble code CONTROL UNIT (RAM), CONTROL UNIT (ROM) with CONSULT-II is detected when TCM memory (RAM) or (ROM).
Possible Cause
Check TCM.
Diagnostic Trouble Code (DTC) Confirmation Procedure
NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch ON and select "DATA MONITOR" mode for A/T with CONSULT-II.
2. Start engine.
3. Run engine for at least 2 seconds at idle speed.
Diagnostic Procedure
1. INSPECTION START
With CONSULT-II
1. Turn ignition switch ON and select "SELF DIAGNOSIS" mode for A/T with CONSULT-II.
2. Touch "ERASE".
3. Perform "Diagnostic Trouble Code (DTC) Confirmation Procedure".
4. Is the "CONTROL UNIT (RAM)" or "CONTROL UNIT (ROM)" displayed again?
Yes or No
Yes >> Replace TCM.
No >> INSPECTION END
Description
The TCM consists of a microcomputer and connectors for signal input and output and for power supply. The unit controls the A/T.
On Board Diagnosis Logic
Diagnostic trouble code CONTROL UNIT (RAM), CONTROL UNIT (ROM) with CONSULT-II is detected when TCM memory (RAM) or (ROM).
Possible Cause
Check TCM.
Diagnostic Trouble Code (DTC) Confirmation Procedure
NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch ON and select "DATA MONITOR" mode for A/T with CONSULT-II.
2. Start engine.
3. Run engine for at least 2 seconds at idle speed.
Diagnostic Procedure
1. INSPECTION START
With CONSULT-II
1. Turn ignition switch ON and select "SELF DIAGNOSIS" mode for A/T with CONSULT-II.
2. Touch "ERASE".
3. Perform "Diagnostic Trouble Code (DTC) Confirmation Procedure".
4. Is the "CONTROL UNIT (RAM)" or "CONTROL UNIT (ROM)" displayed again?
Yes or No
Yes >> Replace TCM.
No >> INSPECTION END
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.