P0840
P0840 TRANSMISSION FLUID PRESSURE SEN/SW A
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1. PRECONDITIONING
If "DTC CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 2.
2. CHECK DTC DETECTION
With CONSULT
1.Start the engine.
2.Warm up the engine. [Set the CVT fluid to 19�C (-4�F) or more.]
NOTE:
When the ambient temperature is 20�C (68�F), the CVT fluid usually increases to 50 to 80�C (122 to
176�F) with driving in an urban area for approximately 10 minutes.
3.Wait for 10 seconds or more.
4.Check DTC.
With GST
Follow the procedure "With CONSULT".
Is "P0840" detected?
YES- Go to "Diagnosis Procedure" .
NO- INSPECTION END
Diagnosis Procedure
Regarding Wiring Diagram information, refer to "Wiring Diagram" Electrical Diagrams.
1. CHECK TCM INPUT SIGNAL
1.Start the engine.
2.Check voltage between TCM connector terminals.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- GO TO 2.
Revision: March 20122013 Infiniti JX
2. CHECK POWER AND SENSOR GROUND
1.Turn ignition switch OFF.
2.Check voltage between TCM terminals.
Is the inspection result normal?
YES- GO TO 3.
NO- Go to "Diagnosis Procedure" P1701.
3. CHECK CIRCUIT BETWEEN TCM AND CVT UNIT
1.Turn ignition switch OFF.
2.Disconnect TCM connector.
3.Disconnect CVT unit connector.
4.Check continuity between TCM harness connector terminals and CVT unit harness connector terminals.
5.Check continuity between TCM harness connector terminals and ground.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace damaged parts.
4. PERFORM INTERMITTENT INCIDENT
Refer to "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- Replace transaxle assembly due to malfunction in secondary pressure sensor. Refer to "Removal and Installation" Removal and Installation.
NO- Repair or replace damaged parts.
Revision: March 20122013 Infiniti JX