Diagnostic guide for P1122

Diagnostic Guide for P1122 - Electric Throttle Control Performance Problem

OBDII code P1122 indicates an issue with the Electric Throttle Control Actuator, which is responsible for regulating the throttle valve position. The goal of this diagnostic guide is to identify the root cause of the performance problem and ensure proper throttle 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, basic hand tools, safety glasses

Safety Notes

Ensure the engine is off and cool before working on the throttle system. Use safety glasses to protect your eyes from debris.

Step 1

Check for Additional Codes

Instruction Connect an OBDII scanner to the vehicle's diagnostic port and check for any additional trouble codes.

Expected result No additional codes are present, or P1122 is the only code.

If Pass If only P1122 is present, proceed to the next step.

If Fail If additional codes are present, diagnose those codes first as they may relate to the throttle control issue.

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Step 2

Inspect the Throttle Control Actuator Harness

Instruction Visually inspect the wiring and connectors of the Electric Throttle Control Actuator for any signs of damage, corrosion, or loose connections.

Expected result Wiring and connectors appear intact and secure.

If Pass If the harness is in good condition, proceed to test the throttle position sensor.

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

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Step 3

Test Throttle Position Sensor (TPS) Voltage

Instruction Using a multimeter, measure the voltage output of the Throttle Position Sensor while manually moving the throttle plate.

Expected result The voltage should change smoothly and consistently as the throttle is opened and closed.

If Pass If the voltage readings are consistent, the TPS is functioning correctly. Proceed to check the Electric Throttle Control Actuator.

If Fail If the voltage readings are erratic or out of range, the TPS may be faulty and should be replaced.

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Step 4

Perform Idle Air Volume Learning Procedure

Instruction Follow the manufacturer's specific procedure for performing the Idle Air Volume Learning to reset the throttle control system.

Expected result The procedure completes successfully without errors.

If Pass If the learning procedure is successful, test drive the vehicle to see if the issue persists.

If Fail If the procedure fails, further diagnosis of the Electric Throttle Control Actuator may be necessary.

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Step 5

Test Electric Throttle Control Actuator Functionality

Instruction With the engine running, observe the operation of the Electric Throttle Control Actuator using the OBDII scanner or by listening for the actuator's movement.

Expected result The actuator should respond appropriately to throttle input without hesitation or irregularities.

If Pass If the actuator operates correctly, the issue may be resolved. Monitor for any reoccurrence of the code.

If Fail If the actuator does not respond correctly, it may need to be replaced.

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