Diagnostic guide for P1757

Diagnostic Guide for P1757 - Governor Pressure Control System Issue

The P1757 code indicates that the governor pressure is above the acceptable limit while the vehicle is stationary. This guide aims to help diagnose the underlying issues affecting the governor pressure control system, which is crucial for proper transmission operation.

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Difficulty

Intermediate

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Estimated Time

30-60 Minutes

Estimated Diagnostic Cost

$0-$100

Typical shop charge to perform this diagnostic process. Repair parts and labor are not included.

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Tools Needed

OBDII scanner, multimeter, transmission fluid pressure gauge, basic hand tools

Safety Notes

Ensure the vehicle is on a flat surface and securely lifted if necessary. Allow the engine to cool before working on the transmission. Be cautious of hot fluids and moving parts.

Step 1

Check for Additional Codes

Instruction Use an OBDII scanner to check for any additional trouble codes that may be present.

Expected result No additional codes or related codes are found.

If Pass If no additional codes are present, proceed to check the governor pressure sensor.

If Fail If additional codes are found, address those issues first as they may be related.

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Step 2

Inspect Transmission Fluid Condition

Instruction Check the transmission fluid for signs of burning or contamination. Look for a dark color or a burnt smell.

Expected result Fluid appears clean and at the correct level.

If Pass If the fluid is in good condition, proceed to test the governor pressure sensor.

If Fail If the fluid is burnt or contaminated, consider changing the fluid and filter before further diagnostics.

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Step 3

Test Governor Pressure Sensor

Instruction Using a multimeter, test the voltage output of the governor pressure sensor while the vehicle is in Drive and stationary.

Expected result Voltage output is within the manufacturer's specified range.

If Pass If the voltage is correct, proceed to check the governor pressure solenoid.

If Fail If the voltage is out of range, replace the governor pressure sensor.

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Step 4

Check Governor Pressure Solenoid Operation

Instruction Test the governor pressure solenoid for proper operation using a pressure gauge to measure the governor pressure while the vehicle is in Drive.

Expected result Governor pressure is within the specified range.

If Pass If the pressure is correct, inspect the valve body for issues.

If Fail If the pressure is too high, the solenoid may be faulty and should be replaced.

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Step 5

Inspect Valve Body for Damage

Instruction Remove the valve body and inspect for any signs of wear, damage, or debris that could affect operation.

Expected result Valve body appears intact with no significant wear or blockages.

If Pass If the valve body is in good condition, check the ECM supply voltage.

If Fail If damage or debris is found, repair or clean the valve body as necessary.

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Step 6

Verify ECM 5 Volt Supply

Instruction Using a multimeter, check the 5-volt supply to the governor pressure sensor and solenoid from the ECM.

Expected result 5-volt supply is present and stable.

If Pass If the supply is good, the ECM may be faulty and should be further tested.

If Fail If the supply is absent or unstable, inspect the wiring and connectors for damage or corrosion.

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