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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TEST REFERENCE - P0869-LINE PRESSURE HIGH

TEST ACTION APPLICABILITY
1
NOTE: Low fluid level can be the cause of many transmission problems. If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid false symptoms.
With the DRBIII®, read the engine DTC's. Check and repair all engine DTC's prior to performing transmission symptom diagnostics.With the DRBIII®, read Transmission DTC's. Record all DTC's and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.Repair as necessary.Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test for P0706 CHECK SHIFTER SIGNAL .For Gear Ratio DTC's, check and record all CVI's.Most DTC's set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run.
NOTE: Verify the flash level of the transmission controller. Some problems are corrected by software upgrades to the transmission controller.
NOTE: Check for applicable TSB's related to the problem.
Perform this procedure prior to Symptom diagnosis.ContinueGo To 2		 All
2 With the DRBIII®, check for other Transmission DTC's
Is the DTC P0932 present also?
Yes --> Refer P0932.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 3		 All
3 The transmission temperature must be at least 180°F or 82°C for the results of this test to be valid.
With the DRBIII®, check the STARTS SINCE SET counter for P0869.
Is the STARTS SINCE SET COUNTER 2 or less?
Yes --> Go To 4
No --> Go To 13		 All
4 Ignition on, engine not running.
With the DRBIII®, monitor the Transmission Line Pressure.
Firmly push the Line Pressure Sensor harness connector inward towards the Transmission.
Did the Line Pressure change to about 207 kPa or 30 PSI when the sensor connector was pushed?
Yes --> Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 5		 All
5 Turn the ignition off to the lock position.
Remove the Starter Relay.
NOTE: Failure to remove the Starter Relay can cause a TCM - No Response condition.

Install the Transmission Simulator Miller tool# 8333.
With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch.
NOTE: Check connectors - Clean/repair as necessary.

Ignition on, engine not running.
With the DRBIII®, monitor the Line Pressure during the following step.
Using the Transmission Simulator, set the rotary knob to each of the 3 line pressure positions.
NOTE: All three DRBIII® Line Pressure readings should be steady and +/- 2.0 PSI of the reading specified on the Transmission Simulator.

Did the Line Pressure remain steady in all three positions?
Yes --> Go To 6
No --> Go To 8		 All
6 Turn the ignition off to the lock position.
Install the Line Pressure Adaptor, Miller tool# 8259, and the Pressure Gauge, Miller tool# C-3293, 0 to 2000 kPa or 0 to 300 PSI.
Start the engine in park.
With the DRBIII®, monitor the Line Pressure.
Monitor the reading on the Pressure Gauge, Miller tool# C-3293.
Compare the Line Pressure reading between the DRBIII® and the Pressure Gauge.
Is the Pressure Gauge reading within 34 kPa or 5 PSI of the DRBIII® reading?
Yes --> Go To 7
No --> Replace the Line Pressure Sensor per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .		 All
7 If there are no possible causes remaining, view repair.
Repair
Repair internal transmission per the Service Information. Inspect the Transmission Oil Pump per the Service Information and replace if necessary. If no problem is found, replace the Transmission Solenoid/TRS Assembly - stuck Pressure Control Solenoid.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .		 All
8 Turn the ignition off to the lock position.
Disconnect the Transmission Control Module harness connector.
Disconnect the Line Pressure Sensor harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the 5-volt Supply circuit from the Line Pressure Sensor harness connector to the Transmission Control Module harness connector.
Is the resistance above 5.0 ohms?
Yes --> Repair the 5-volt Supply circuit for an open.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 9		 All
9 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the Line Pressure Sensor harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between ground and the 5-volt Supply circuit.
Is the resistance below 5.0 ohms?
Yes --> Repair the 5-volt Supply circuit for a short to ground.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 10		 All
10 Turn the ignition off to the lock position.
Disconnect the Transmission Control Module harness connector.
Disconnect the Transmission Solenoid/TRS harness connector
NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Pressure Control Solenoid Control circuit from the Transmission Control Module harness connector to the Solenoid/TRS harness connector.
Is the resistance above 5.0 ohms?
Yes --> Repair the Pressure Control Solenoid Control circuit for an open.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 11		 All
11 Turn the ignition off to the lock position.
Disconnect the Transmission Control Module harness connector.
Disconnect the Transmission Solenoid/TRS harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between ground and the Pressure Control Solenoid Control circuit.
Is the resistance below 5.0 ohms?
Yes --> Repair the Pressure Control Solenoid Control circuit for a short to ground.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 12		 All
12 Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention to all power and ground circuits.
If there are no possible causes remaining, view repair.
Repair
Replace the Transmission Control Module per the Service Information. WITH THE DRBIII® PERFORM QUICK LEARN 
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .		 All
13 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 shorts and open circuits.
With the DRBIII®, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.
Were there any problems found?
Yes --> Repair as necessary.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Test Complete.		 All
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