Code No. P0221: Trustful Check Throttle Position Sensor (sub)

FUNCTION

Compare the actual measurement of manifold absolute pressure by an manifold absolute pressure sensor signal with manifold absolute pressure estimated from a throttle position sensor (sub) signal.

TROUBLE JUDGEMENT

Check Conditions

Ignition switch is "ON" position.
Manifold absolute pressure sensor is normal.

Judgement Criterion

Difference is more than specified value between manifold absolute pressure of actual manifold absolute pressure sensor reading and that of supposed throttle position sensor (sub) signal.

FAIL-SAFE AND BACKUP FUNCTION

Throttle opening degree is restricted.
Throttle opening degree position is in default position if throttle position sensor (main) fails.

PROBABLE CAUSES

Failed throttle position sensor (sub)
Harness damage in throttle position sensor (sub) circuit or loose connector contact
Failed intake air system
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q. Is any other diagnosis code than P0221 output?

	Inspection chart for diagnosis code (Refer to ).

	Go to Step 2.

STEP 2. M.U.T.-III data list

Refer to Data List Reference Table .

Item 15: Throttle position sensor (sub)

Q. Is the check result normal?

	Go to Step 3.

	Check throttle position sensor (sub) system. Check code No. P0222: throttle position sensor (sub) circuit low input (Refer to ). Check code No. P0223: throttle position sensor (sub) circuit high input (Refer to ).

STEP 3. Check air inlet from inlet hose and inlet manifold.

Q. Is the check result normal?

	Go to Step 4.

	Repair.

STEP 4. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is diagnosis code stored?

	Replace the engine-ECU.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).