P0847-SECONDARY OIL PRESSURE SENSOR CIRCUIT LOW





For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The Transmission Control Module (TCM) monitors the input voltage from the secondary pulley pressure sensor. When the voltage is below a predetermined limit a DTC will set.


  • When Monitored:

    Ignition on, system voltage between 9.0 and 16.0 volts.

    Transmission temperature greater than -20° C (-4° F)

    No active DTCs from the following:

  • Primary Oil Pressure Sensor High
  • Sensor ground
  • Set Condition:

    When the monitored voltage drops below 0.09 volts for the period of 5 seconds.


Possible Causes
  
(T72) 5 VOLT SUPPLY CIRCUIT OPEN
  
(T50) SECONDARY PRESSURE SENSOR SIGNAL CIRCUIT OPEN
  
(T50) SECONDARY PRESSURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND
  
INTERNAL TRANSMISSION
  
TRANSMISSION CONTROL MODULE
  

Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)



Diagnostic Test

1.CHECK THE SECONDARY PRESSURE SENSOR VOLTAGE



Is the voltage below 0.09 volts?

Yes
  • Go To 2


No
  • Go To 7

2.CHECK THE (T72) 5 VOLT SUPPLY CIRCUIT








Is the voltage 5.0 volts (± 0.2 volts)?

Yes
  • Go To 3


No
  • Go To 6

3.CHECK THE (T50) SECONDARY PRESSURE SENSOR SIGNAL CIRCUIT









Is the voltage 5.0 volts (± 0.2 volts)?

Yes


No
  • Go To 4

4.CHECK THE (T50) SECONDARY PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN







Is the resistance above 5.0 ohms?

Yes


No
  • Go To 5

5.CHECK THE (T50) SECONDARY PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND





Is the resistance below 5.0 ohms?

Yes


No
  • Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.
  • Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

6.CHECK THE (T72) 5 VOLT SUPPLY CIRCUIT FOR AN OPEN





Is the voltage 5.0 volts (± 0.2 volts)?

Yes


No
  • Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.
  • Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

7.INTERMITTENT WIRING AND CONNECTORS





Were there any problems found?

Yes


No
  • Test Complete.