P0845

DTC P0845: Malfunction of Primary Pressure Sensor

PRIMARY PRESSURE SENSOR SYSTEM CIRCUIT





DIAGNOSTIC FUNCTION
TCM determines that malfunction is present when the primary pressure sensor output voltage is too high or too low.

DESCRIPTIONS OF MONITOR METHODS
^ The status with the fluid temperature higher than - 20° C (- 4° F) and with the primary pressure sensor voltage of 4.69 volts or more continues for 5 seconds.
^ The status with the fluid temperature higher than -20° C (- 4° F) and with the primary pressure sensor voltage of 0.09 volt or less continues for 5 seconds.

MONITOR EXECUTION
^ CVT fluid temperature: -20° C (- 4° F) or more

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ P0741: Abnormality in lockup function
^ P0746: Abnormality in hydraulic control system function
^ P0841: Abnormality in line pressure sensor function

Sensor (The sensor below is determined to be normal)
^ Not applicable

LOGIC FLOW CHARTS (Monitor Sequence)





DTC SET CONDITIONS

Judgment Criteria
^ Primary pressure sensor voltage [transmission fluid temperature: more than -20° C (- 4° F) 4.69 volts or more. (5 seconds)
^ Primary pressure sensor voltage [transmission fluid temperature: more than -20° C (- 4° F) 0.09 volt or less. (5 seconds)

OBD-II DRIVE CYCLE PATTERN
Ignition switch: ON (start the engine and keep it for 10 seconds or more)

PROBABLE CAUSES
^ Malfunction of valve body assembly (Faulty primary pressure sensor)
^ Damaged wiring harness and connectors
^ Malfunction of TCM

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III data list
^ Item 18: Primary pressure.

Q: Is the check result normal?
YES: Intermittent malfunction
NO: Go to Step 2.

STEP 2. Check the following connector:
^ B-08 CVT assembly connector
^ C-40 TCM connector
Check the terminals for a contact status problem and internal short circuit.

Q: Is the check result normal?
YES: Go to Step 3.
NO: Repair the defective connector.

STEP 3. Check for open circuit and short to ground in the wiring harness between the TCM connector and the CVT assembly connector.
^ Between C-40 TCM connector (terminal No.47) and B-08 CVT assembly connector (terminal No. 18)
^ Between C-40 TCM connector (terminal No.48) and B-08 CVT assembly connector (terminal No. 19)
^ Between C-40 TCM connector (terminal No.49) and B-08 CVT assembly connector (terminal No.5)

Q: Is the check result normal?
YES: Go to Step 4.
NO: Repair the wiring harness.

STEP 4. Symptom recheck after replacing the valve body assembly

Q: Is the check result normal?
YES: The procedure is complete.
NO: Replace TCM