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P0869

P0869-LINE PRESSURE HIGH





When Monitored:
Continuously while driving in a forward gear.

Set Condition:
The PCM continuously monitors Actual Line Pressure. If the Actual Line Pressure reading is greater than the highest Desired Line Pressure ever used in the current gear, while the Pressure Control Solenoid duty cycle is at or near its maximum value (which should result in minimum line pressure), the DTC will set.

Possible Causes
- (F856) 5-VOLT SUPPLY CIRCUIT OPEN
- LINE PRESSURE SENSOR CONNECTION
- (T140) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT OPEN
- (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND
- (T140) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT SHORT TO GROUND
- INTERNAL TRANSMISSION
- LINE PRESSURE SENSOR
- POWERTRAIN CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Testing and Inspection

Theory of Operation
Line pressure is measured by the Line Pressure Sensor (LPS) and regulation is achieved by changing the duty cycle of the Pressure Control Solenoid (PCS) controlled by the Transmission Control System. (5% duty cycle = solenoid off = max line pressure, 62% duty cycle = solenoid on = min line pressure). The Transmission Control System calculates the desired line pressure based on inputs from both the engine and transmission.

The Transmission Control System calculates torque input to the transmission and uses it as the primary input to the desired line pressure calculation. This is called Torque Based Line Pressure. In addition, the line pressure is set to a preset level 827 or 931kPa (120 or 135 PSI) during shifts and in Park and Neutral to ensure consistent shift quality. The desired line pressure is continuously being compared to the actual line pressure. If the actual line pressure is consistently higher than the desired line pressure, the line pressure high DTC P0869 (CB) will set.

Diagnostic Test
1. CHECK FOR RELATED DTC'S





With the scan tool, check for other Transmission DTC's
Is the DTC P0932 present also?
Yes >>Refer to the Transmission category and perform the appropriate symptom.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. Verification Tests
No >>Go To 2

2. CONDITION P0869 PRESENT





With the scan tool, check the STARTS SINCE SET counter for P0869.
Is the STARTS SINCE SET COUNTER 2 or less?
Yes >>Go To 3
No >>Go To 10

3. CHECK LINE PRESSURE SENSOR CONNECTION





Ignition on, engine not running.
With the scan tool, 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 4

4. PCM AND WIRING





Turn the ignition off to the lock position.
Remove the Starter Relay.

Note: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter.

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 scan tool, monitor the Line Pressure during the following step.
Using the Transmission Simulator, set the rotary switch to each of the 3 line pressure positions.

Note: All three scan tool Line Pressure readings should be steady and +14 kPa or 2.0 PSI of the reading specified on the Transmission Simulator.

Did the Line Pressure read within +14 kPa or 2.0 PSI in all three positions?
Yes >>Go To 5
No >>Go To 6

5. CHECK LINE PRESSURE SENSOR CALIBRATION





Turn the ignition off to the lock position.
Disconnect the Transmission Simulator, Miller tool # 8333 and reconnect all previously disconnected connectors.
Install the Line Pressure Adaptor, Miller tool # 8259, and Pressure Gauge, Miller tool # C-3293, 0 to 2000 kPa or 0 to 300 PSI.
Start the engine in park.
Monitor the Line Pressure readings on the scan tool and the pressure gauge.
Compare the Line Pressure readings between the scan tool and the pressure gauge.
Is the pressure gauge reading within 34 kPa or 5 PSI of the scan tool reading?
Yes >>Repair the internal transmission and inspect the Transmission Oil Pump per the Service Information and replace if necessary. If no problem is found, replace the Transmission Solenoid/TRS Assembly, possible cause is a stuck Pressure Control Solenoid.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No >>Replace the Line Pressure Sensor per the Service information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

6. (T140) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT OPEN





Turn the ignition off to the lock position.
Disconnect the Transmission Simulator, Miller tool # 8333.
Disconnect the Powertrain Control Module C4 harness connector.

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 tool # 8815 to perform diagnosis.

Measure the resistance of the (T140) Pressure Control Solenoid Control circuit from the appropriate terminal of Miller tool # 8815 to the Solenoid/TRS harness connector.
Is the resistance above 5.0 ohms?
Yes >>Repair the (T140) Pressure Control Solenoid Control circuit for an open.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No >>Go To 7

7. (T140) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT SHORT TO GROUND





Measure the resistance between ground and the (T140) Pressure Control Solenoid Control circuit.
Is the resistance below 5.0 ohms?
Yes >>Repair the (T140) Pressure Control Solenoid Control circuit for a short to ground.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No >>Go To 8

8. (F856) 5-VOLT SUPPLY CIRCUIT OPEN





Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure Sensor harness connector to the appropriate terminal of Miller tool # 8815.
Is the resistance above 5.0 ohms?
Yes >>Repair the (F856) 5-volt Supply circuit for an open.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No >>Go To 9

9. (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND





Disconnect the PCM C1 harness connector. Disconnect the Line Pressure Sensor harness connector.

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 tool # 8815 to perform diagnosis.

Measure the resistance between ground and the (F856) 5-volt Supply circuit.
Is the resistance below 5.0 ohms?
Yes >>Repair the (F856) 5-volt Supply circuit for a short to ground.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No >>Replace the Powertrain Control Module per the Service Information. With the scan tool perform the QUICK LEARN procedure.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

10. 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.
With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.
Where there any problems found?
Yes >>Repair as necessary.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No >>Test Complete.
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