Code No. P0533: A/C Pressure Sensor Circuit High Input

OPERATION

A power voltage of 5 V is applied to the A/C pressure sensor connector power terminal from the engine-ECU connector terminal ACP5&BVS5 and earthed to the engine-ECU connector terminal ACPE&BVSE from the A/C pressure sensor connector earth terminal.
The sensor signal is inputted to the engine-ECU connector terminal AC/P from the A/C pressure sensor connector output terminal.

FUNCTION

The A/C pressure sensor detects a change in A/C refrigerant pressure and inputs the signal to the engine-ECU.

TROUBLE JUDGEMENT

Check Conditions

After 2 seconds since the ignition switch is turned ON or since the completion of engine start.
Battery positive voltage is more than 10 V and is less than 16.5 V.

Judgement Criterion

Sensor output voltage is 4.8 V or more for 4 seconds.

FAIL-SAFE AND BACKUP FUNCTION

None

PROBABLE CAUSES

Failed A/C pressure sensor
Open circuit or harness damage in A/C pressure sensor circuit or loose connector contact
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

Refer to Data List Reference Table .

Item 172: A/C pressure sensor (voltage)
Item 175: A/C pressure sensor (pressure)

Q. Is the check result normal?

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

	Go to Step 2.

STEP 2. Perform resistance measurement at A/C pressure sensor connector.

Disconnect connector, and measure at harness side.
Resistance between terminal ACPE&BVSE line and earth.

OK: Continuity (2 Ω or less)

Q. Is the check result normal?

	Go to Step 5.

	Go to Step 3.

STEP 3. Check of open circuit and damage in ACPE&BVSE line between A/C pressure sensor connector and engine-ECU connector.

Q. Is the check result normal?

	Go to Step 4.

	Repair the connector(s) or wiring harness.

STEP 4. M.U.T.-III data list

Refer to Data List Reference Table .

Item 172: A/C pressure sensor (voltage)
Item 175: A/C pressure sensor (pressure)

Q. Is the check result normal?

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

	Replace the engine-ECU.

STEP 5. M.U.T.-III data list

Refer to Data List Reference Table .

Item 172: A/C pressure sensor (voltage)
Item 175: A/C pressure sensor (pressure)

Q. Is the check result normal?

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

	Go to Step 6.

STEP 6. Replace the A/C pressure sensor

After replacing the A/C pressure sensor, reconfirm whether the diagnosis code is stored.

Q. Is the diagnosis code stored?

	Replace the engine-ECU.

	Check end.