P0760-OD SOLENOID CIRCUIT





For a complete wiring diagram Refer to Section 8W

Theory of Operation


The Transmission Control System uses six electronically controlled solenoids that allow hydraulic fluid to be applied to various friction elements (clutches), which enables the gear requested. The continuity of each solenoid circuit is periodically tested. Each inactive solenoid is turned on for a few milliseconds, then off. Each active solenoid is turned off for a few milliseconds, then on. This pulsing of voltage to the solenoid causes an inductive spike which can be sensed by the Transmission Control System. If an inductive spike is not sensed by the Transmission Control System during the continuity check, it is tested again. If the test fails three consecutive times, the appropriate Diagnostic Trouble Code (DTC) is set. If the solenoid test is run in response to a gear ratio or pressure switch error, one failure will result in setting the appropriate DTC.


  • When Monitored:

    Initially at power-up, then every 10 seconds thereafter. The solenoid circuits will also be tested immediately after a gear ratio or pressure switch error is detected.

  • Set Condition:

    After three consecutive solenoid continuity test failures, or one failure if test is run in response to a gear ratio or pressure switch error.

    NOTE: This DTC is strictly an electrical fault and cannot be caused by any internal transmission failure other than an open in the Transmission Solenoid/TRS Assembly. If the Transmission Solenoid/TRS Assembly is in need of replacement — do not replace the Valve Body.


Possible Causes
 
RELATED TCM POWER INPUT DTCS PRESENT
 
(T60) OD SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS
 
(T60) OD SOLENOID CONTROL CIRCUIT OPEN
 
(T60) OD SOLENOID CONTROL CIRCUIT SHORT TO GROUND
 
TRANSMISSION SOLENOID/TRS ASSEMBLY
 
POWERTRAIN CONTROL MODULE
 


Always perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)



Diagnostic Test

1.CHECK DTCS



Are there any TIPM TCM Power Control Circuit or TCM Power Input DTCs present?

Yes
  • Refer to the Transmission category and perform the appropriate symptom.


No
  • Go To 2

2.CHECK IF DTC P0760 IS PRESENT





CAUTION: Removal of the Starter Relay will prevent the vehicle from being started in gear.


WARNING: The Starter Relay must be removed from the PDC. Failure to do so can result in personal injury or death.


NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition.







Did the OD Solenoid LED on the Transmission Simulator blink on and off?

Yes
  • Go To 3


No
  • Go To 5

3.CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY




Did the DTC P0760 reset during the actuation test?

Yes
  • Go To 5


No
  • Go To 4

4.CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY




Did the DTC P0760 reset during the actuation test?

Yes


No

5.CHECK THE (T60) OD SOLENOID CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT








Is the resistance below 5.0 ohms between the (T60) OD Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector?

Yes


No
  • Go To 6

6.CHECK THE (T60) OD SOLENOID CONTROL CIRCUIT FOR AN OPEN




CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller special tool #8815 to perform diagnosis.




Is the resistance above 5.0 ohms?

Yes


No
  • Go To 7

7.CHECK THE (T60) OD SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND





Is the resistance below 5.0 ohms?

Yes


No
  • Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN.
  • Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)