Code Description: P0753 - Trans 3-4 Shift Solenoid / Trans Relay Circuits
Functional Operation; 4th gear operation is provided electrically through the OD solenoid. The voltage in the OD Solenoid control circuit is monitored by the PCM whenever the key is on. If the actual circuit voltage is different than the expected voltage, code P0753 will set.
# Failed Transmission Control Relay
# Failed OD Solenoid
# Open or shorted OD Solenoid control circuit
# Open or shorted Trans Control Relay output circuit
# Open or shorted Fused B+ circuit
# PCM - Internal failure
1. Be sure to perform the Preliminary Tests
2. If any of the following codes are present, diagnose them first; P1765
3. Disconnect the solenoid connector at the transmission and check for the presence of battery voltage at pin #1 with the engine running. If there is no voltage present, perform test P1765.
4. If codes P0743, P0748 and P0753 are all present, and you have 12 volts at pin # 1 of the solenoid connector, replace the TCC / OD solenoid assembly.
5. Disconnect the solenoid connector at the transmission to test the OD Solenoid. Connect an ohmmeter across pin# 6 and pin# 1 of the solenoid connector on the transmission side. The resistance should be between 25 & 60 ohms. If not, replace the TCC / OD Solenoid assembly.
6. Measure the resistance between pin# 6 of the solenoid connector (transmission side) and a good ground. If you have less than 5 ohms, replace the TCC / OD Solenoid assembly.
7. Disconnect the solenoid connector at the transmission to test the internal wiring. Make sure that your Governor Solenoid connector (inside the pan) is plugged in if you disconnected it in the previous step. Connect an ohmmeter across the pins of the solenoid connector on the transmission side. Resistance values should be as follows;
* Between pin# 6 and pin# 2 = above 100K ohms
* Between pin# 6 and pin# 3 = above 100K ohms
* Between pin# 6 and pin# 4 = above 100K ohms
* Between pin# 6 and pin# 5 = 28 - 68 ohms
* Between pin# 6 and pin# 7 = 50 - 120 ohms
* Between pin# 6 and pin# 8 = above 100K ohms
If any of the resistance values (above) are not within specs, replace the TCC / OD solenoid assembly.
8. Check the integrity of the OD Solenoid control circuit from the PCM connector to the transmission solenoid connector.
9. Check the OD Solenoid control circuit for a short to ground.
10. Check the OD Solenoid control circuit for a short to voltage.
11. Check the integrity of the Trans Control Relay output circuit from the Trans Control Relay connector to the solenoid connector.
12. Check the Trans Control Relay output circuit for a short to ground.
13. Disconnect all three PCM connectors. Disconnect the solenoid connector at the transmission and measure the resistance across pin# 6 and every other pin in the connector. Each pin should measure over 100K ohms. If you have under 100K ohms between pin# 6 and any other circuit in the connector, repair the wiring harness for wiring shorted together.
14. If all other possible causes have been eliminated, replace the Powertrain Control Module (PCM).
Terry aka tactransman
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