Diagnostic guide for P1705

Diagnostic Guide for P1705 - Throttle Position Sensor Issue

The P1705 code indicates a problem with the Throttle Position Sensor (TPS) communication between the Engine Control Module (ECM) and the Transmission Control Module (TCM). The goal of this diagnostic guide is to identify the root cause of the issue to ensure proper throttle control and 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, wiring diagram, basic hand tools

Safety Notes

Ensure the vehicle is on a flat surface and securely supported if lifted. Be cautious of hot engine components and moving parts during diagnosis.

Step 1

Scan for Diagnostic Codes

Instruction Connect the OBDII scanner to the vehicle's diagnostic port and retrieve any stored trouble codes.

Expected result The scanner should display the P1705 code along with any other related codes.

If Pass If P1705 is present, proceed to the next step to inspect the Throttle Position Sensor.

If Fail If P1705 is not present, further investigation may be needed for other codes or issues.

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Step 2

Inspect Throttle Position Sensor Wiring

Instruction Visually inspect the wiring and connectors leading to the Throttle Position Sensor for any signs of damage, corrosion, or loose connections.

Expected result Wiring should be intact, and connectors should be secure without corrosion.

If Pass If the wiring and connectors are in good condition, proceed to test the sensor's voltage output.

If Fail If any damage or poor connections are found, repair or replace the affected components.

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Step 3

Test Throttle Position Sensor Voltage Output

Instruction Using a multimeter, measure the voltage output of the Throttle Position Sensor while the ignition is on but the engine is off. Compare the readings to the specifications in the service manual.

Expected result The voltage output should match the specified range for the TPS.

If Pass If the voltage is within specifications, the TPS is likely functioning correctly. Proceed to check the ECM and TCM communication.

If Fail If the voltage is out of range, the TPS may be faulty and should be replaced.

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Step 4

Check ECM and TCM Communication

Instruction Using the OBDII scanner, check for any communication issues between the ECM and TCM. Look for any related codes or communication errors.

Expected result The scanner should show successful communication with both the ECM and TCM.

If Pass If communication is normal, the issue may lie within the TCM or its programming. Further diagnostics may be needed.

If Fail If there are communication errors, inspect the CAN bus wiring and connections for faults.

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Step 5

Perform a Throttle Position Sensor Calibration

Instruction If the TPS has been replaced or repaired, perform a calibration procedure using the OBDII scanner or according to the manufacturer's specifications.

Expected result The calibration should complete successfully without errors.

If Pass If calibration is successful, clear the codes and test drive the vehicle to ensure the issue is resolved.

If Fail If calibration fails, further investigation into the TPS or ECM may be necessary.

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Coddy can help with this step only. Tell me what you tested or what result you got.