Nissan Altima 2007-2012 Service Manual: P0845 transmission fluid pressure sensor B (pri pressure sensor)

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".

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.

    P0841 pressure sensor function
    Description Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolution speed as input signal, TCM changes the operating pressure of the pr ...

    P0868 secondary pressure down
    Description The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pressure to suit the driving condition in response to a signal sent from the TCM. DT ...

    Other materials:

    P1740 lock-up select solenoid valve
    Description • Lock-up select solenoid valve controls lock-up clutch pressure or forward clutch pressure (reverse brake pressure). • When controlling lock-up clutch, the valve is turned OFF. When controlling forward clutch, it is turned ON. DTC Logic DTC DETECTION LOGIC DTC CONFIRM ...

    Bluetooth® streaming audio without Navigation System (Type A) (if so equipped)
    If you have a compatible Bluetooth® audio device that is capable of playing audio files, the device can be connected to the vehicle’s audio system so that the audio files on the device play through the vehicle’s speakers. Connecting Bluetooth® audio To connect your Bluetooth® audio de ...

    B2108 steering lock relay
    Description The steering lock relay ON signal is transmitted to IPDM E/R by BCM via CAN communication. IPDM E/R turns the steering lock relay ON and transmits the release of the steering to BCM. DTC Logic DTC DETECTION LOGIC NOTE: • If DTC B2108 is displayed with DTC U1000, first perf ...