P0845
There is a service bulletin for the P0845. Code for the following Nissan Models. 2007-2008 Nissan Altima 2007-2008 Nissan Rogue 2007-2008 Nissan Sentra. The bulletin suggest replacing the transmission valve body. Error Code P0845 is usually an electrical circuit (TFPS sensor circuit) problem. However, it can also be caused by mechanical problems such as cracked or missing check balls in the valve body, internal leaks, stuck valve in the valve body, or low system operating pressure/mainline pressure.
OBD-II Code P0845 is defined as a Transmission Fluid Pressure Sensor/Switch 'B' Circuit The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. P0845 Transmission Fluid Pressure Sensor/ Switch B Circuit - Chrysler 2005 300 question. Products P0845, Prime Conduit, Prime Conduit 49411-010, Extra Heavy Wall PVC Conduit 2 in trade, SCH 80, 10 ft, Integral Bell Connection: Electrical, Conduit & Conduit Fittings, Flexible Conduit.
Description
The transmission fluid pressure sensor B (primary pressure sensor) detects primary pressure of CVT and sends TCM the signal.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
NOTE: If “DTC CONFIRMATION PROCEDURE” has been previously performed, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
1.CHECK DTC DETECTION
1. Turn ignition switch ON.
2. Select “DATA MONITOR”.
3. Make sure that output voltage of line temperature sensor is within the range below.
ATF TEMP SEN : 1.0 – 2.0 V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the voltage (cool down the fluid)
4. Start engine and wait for at least 5 consecutive seconds.
Follow the procedure “With CONSULT-III”.
Is “P0845 TR PRS SENS/B CIRC” detected? YES >> Go to TM-166, 'Diagnosis Procedure'.
NO >> Check intermittent incident. Refer to GI-42, 'Intermittent Incident'.
Diagnosis Procedure
1.CHECK INPUT SIGNAL
1. Start engine.
2. Check voltage between TCM harness connector F16 terminal 14 and ground.
3. Turn ignition switch OFF.
Is the inspection result normal? YES >> GO TO 8.
NO >> GO TO 2.
2.CHECK SENSOR POWER AND SENSOR GROUND
1. Turn ignition switch ON.
2. Check voltage between TCM harness connector F16 terminal 25 and 26.
Is the inspection result normal? YES >> GO TO 3.
NO >> GO TO 5.
3.CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR B (PRIMARY PRESSURE SENSOR)] (PART 1)
1. Turn ignition switch OFF.
2. Disconnect TCM harness connector and CVT unit harness connector.
3. Check continuity between TCM harness connector F16 (A) terminal 14 and CVT unit harness connector F46 (B) terminal 25.
Is the inspection result normal? YES >> GO TO 4.
NO >> Repair or replace damaged parts.
4.CHECK HARNESS BETWEEN TCM AND CVT UNIT [TRANSMISSION FLUID PRESSURE SENSOR B (PRIMARY PRESSURE SENSOR)] (PART 2)
Check continuity between TCM harness connector F16 terminal 14 and ground.
Is the inspection result normal? YES >> GO TO 7.
NO >> Repair or replace damaged parts.
5.CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART 1)
1. Turn ignition switch OFF.
2. Disconnect TCM harness connector and CVT unit harness connector.
3. Check continuity between TCM harness connector F16 (A) terminal 25, 26 and CVT unit harness connector F46 (B) terminal 19, 20.
Is the inspection result normal? YES >> GO TO 6.
NO >> Repair or replace damaged parts.
6.CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART 2)
Check continuity between TCM harness connector F16 terminal 25, 26 and ground.
Is the inspection result normal? YES >> GO TO 7.
NO >> Repair or replace damaged parts.
7.CHECK TCM
1. Replace same type TCM. Refer to TM-254, 'Exploded View'.
2. Connect each connector.
3. Perform “DTC CONFIRMATION PROCEDURE”. Refer to TM-166, 'DTC Logic'.
P0845 Altima
Is “P0840 TR PRS SENS/A CIRC” detected? YES >> Replace transaxle assembly. Refer to TM-259, 'Exploded View'.
NO >> Replace TCM. Refer to TM-254, 'Exploded View'.
8.DETECT MALFUNCTIONING ITEMS
Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal? YES >> Replace TCM. Refer to TM-254, 'Exploded View'.
NO >> Repair or replace damaged parts.
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P0845
Are you having problems fixing diagnostic trouble code (DTC) P0845 2/4 Hydraulic Pressure Test Failure? Are you looking for code P0845 troubleshooting help, code P0845 diagnosis tips, code P0845 diagnostics or code P0845 technical information? Do you just have code P0845 questions and need some answers about 2/4 Hydraulic Pressure Test Failure? Do you have diagnostic trouble code (DTC) P0845 2/4 Hydraulic Pressure Test Failure and need troubleshooting information?
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