13A-DTC P0238: Boost Pressure Circuit High Input

DTC P0238: Boost Pressure Circuit High Input

CIRCUIT OPERATION

A 5-volts voltage is supplied to the boost pressure sensor power terminal from ECM terminal UPS5. The ground terminal is grounded with ECM terminal E.
A voltage that is proportional to the intake charge pressure is sent to the ECM terminal UPS from the boost pressure sensor output terminal.

TECHNICAL DESCRIPTION

The boost pressure sensor outputs a voltage which corresponds to the intake charge pressure.
The ECM checks whether this voltage is within a specified range.

DESCRIPTIONS OF MONITOR METHODS

Boost pressure sensor output voltage is out of specified range.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC set in memory for the item monitored below)

Not applicable

Sensor (The sensor below is determined to be normal)

Not applicable

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

8 minutes or more have passed since the engine starting sequence was completed.

Engine coolant temperature is more than 0°C (32°F).

Judgment Criterion

Boost pressure sensor output voltage is more than 4.6 volts for 2 seconds.

FAIL-SAFE AND BACKUP FUNCTION

Intake charge pressure is restricted.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

Boost pressure sensor failed.
Open boost pressure sensor circuit, harness damage or connector damage.
ECM failed.

DIAGNOSIS

STEP 1. Using scan tool (M.U.T.-IIISE), check data list item 125: Boost Pressure Sensor.

caution

To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).

(1) Connect scan tool (M.U.T.-IIISE). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE)

(2) Turn the ignition switch to the "ON" position.

(3) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 125, Boost Pressure Sensor.

When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).
When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).
When altitude is 1,200 m (3,937 feet), 88 kPa (26.0 in.Hg).
When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 in.Hg).

(4) Start the engine.

When the engine is idling, 70 - 110 kPa (20.7 - 32.4 in.Hg) (Near the atmospheric).
When the engine is suddenly revved, intake charge pressure varies.

(5) Turn the ignition switch to the "LOCK" (OFF) position.

Is the sensor operating properly?

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions

Go to Step 2.

STEP 2. Measure the resistance at boost pressure sensor connector.

(1) Disconnect the connector and measure at the harness side.

(2) Measure the resistance between terminal E line and ground.

Continuity (2 ohms or less)

Does continuity exist?

Go to Step 5.

Go to Step 3.

STEP 3. Check of open circuit and harness damage in E line between boost pressure sensor connector and ECM connector.

Is the harness wire in good condition?

Go to Step 4.

Repair the connector(s) or wiring harness. Then go to Step 7.

STEP 4. Using scan tool (M.U.T.-IIISE), check data list item 125: Boost Pressure Sensor.

(1) Turn the ignition switch to the "ON" position.

(2) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 125, Boost Pressure Sensor.

When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).
When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).
When altitude is 1,200 m (3,937 feet), 88 kPa (26.0 in.Hg).
When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 in.Hg).

(3) Start the engine.

When the engine is idling, 70 - 110 kPa (20.7 - 32.4 in.Hg) (Near the atmospheric).
When the engine is suddenly revved, intake charge pressure.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Is the sensor operating properly?

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions

Replace the ECM (Refer to Removal and Installation

). Then go to Step 7.

STEP 5. Using scan tool (M.U.T.-IIISE), check data list item 125: Boost Pressure Sensor.

(1) Turn the ignition switch to the "ON" position.

(2) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 125: Boost Pressure Sensor.

When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).
When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).
When altitude is 1,200 m (3,937 feet), 88 kPa (26.0 in.Hg).
When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 in.Hg).

(3) Start the engine.

When the engine is idling, 70 - 110 kPa (20.7 - 32.4 in.Hg) (Near the atmospheric).
When the engine is suddenly revved, intake charge pressure.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Is the sensor operating properly?

It can be assumed that this malfunction is intermittent. 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 boost pressure sensor.

(1) Replace the boost pressure sensor.

(2) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1

(3) Check the diagnostic trouble code (DTC).

Is DTC P0238 set?

Replace the ECM (Refer to Removal and Installation

). Then go to Step 7.

The inspection is complete.

STEP 7. Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1

(2) Check the diagnostic trouble code (DTC).

Is DTC P0238 set?

Retry the troubleshooting.

The inspection is complete.