P0962-PRESSURE CONTROL SOLENOID A CONTROL CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The Transmission Control Module (TCM) regulates the line pressure by pulsing the line pressure solenoid. The TCM monitors the line pressure solenoid voltage and current draw during operation.
- When Monitored:
Ignition on with a system voltage between 9.0 and 16.0 volts.
- Set Condition:
If the monitored line pressure solenoid voltage is less than 70% of the target line pressure solenoid voltage for the period of 1.0 second.
| Possible Causes |
| (T20) LINE PRESSURE SOLENOID CONTROL CIRCUIT SHORT TO GROUND |
| LINE PRESSURE SOLENOID |
| 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 TO SEE IF THE DTC IS ACTIVEWith the scan tool, read Transmission DTCs.
Is the status Active for this DTC or is the STARTS SINCE SET counter 2 or less?
Yes
- Go To 2
No
- Go To 4
2. CHECK THE (T20) LINE PRESSURE SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off to the lock position.
Disconnect the TCM C1 harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.
Measure the resistance between ground and the (T20) Line Pressure Solenoid Control circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the (T20) Line Pressure Solenoid Control circuit for a short to ground.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Go To 3
3. CHECK THE (T20) LINE PRESSURE SOLENOID CONTROL CIRCUIT
Turn the ignition off to the lock position.
Reconnect the TCM C1 harness connector.
Ignition on, engine not running.
With the scan tool actuate the Line Pressure Solenoid.
Using a test light connected to ground, check the (T20) Line Pressure Solenoid Control circuit in the Transmission Solenoid/Pressure Switch Assembly harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
- Replace the Line Pressure Solenoid (Valve Body) or the CVT per the Service Information.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
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)
4. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wires while checking for shorted and open circuits.
Were there any problems found?
Yes
- Repair as necessary.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Test Complete.