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P0235 TC BOOST SENSOR
[M9R]

< COMPONENT DIAGNOSIS >

P0235 TC BOOST SENSOR

A

Description

INFOID:0000000001307494

The turbocharger boost sensor detects pressure in the exit side of the charge air cooler. The sensor output ECR
voltage to the ECM increases as pressure increases.

DTC Logic

INFOID:0000000001451448

C

DTC DETECTION LOGIC
DTC No.

P0235

Trouble diagnosis name

DTC detecting condition

Turbocharger boost sensor circuit
low input

An excessively low voltage from the sensor is
sent to ECM.

Turbocharger boost sensor circuit
high input

An excessively high voltage from the sensor is
sent to ECM.

Turbocharger boost sensor circuit
range/performance

Rationally incorrect voltage from the sensor is
sent to ECM, compared with the voltage signal
from barometric pressure sensor (built-into
ECM)

Possible cause

• Harness or connectors
(Turbocharger boost sensor circuit
is open or shorted.)
• Turbocharger boost sensor
• Barometric pressure sensor (builtinto EC)

DTC CONFIRMATION PROCEDURE

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1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 20 seconds before conducting the next test.
>> GO TO 2.

I

2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to ECR-161, "Diagnosis Procedure".
NO
>> INSPECTION END

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Diagnosis Procedure

INFOID:0000000001307496

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1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF and wait at least 20 seconds.
2. Check ground connection E17. Refer to Ground inspection in GI-41, "Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO
>> Repair or replace ground connection.

2.CHECK TUBOCHARGER BOOST SENSOR POWER SUPPLY CIRCUIT
1.
2.
3.

H

Disconnect turbocharger boost sensor harness connector.
Turn ignition switch ON.
Check the voltage between turbocharger boost sensor harness connector and ground.

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P

Turbocharger boost sensor
Connector

Terminal

F84

3

Ground

Voltage

Ground

Approx. 5V

Is the inspection result normal?
YES >> GO TO 3.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.

ECR-161

P0235 TC BOOST SENSOR
[M9R]

< COMPONENT DIAGNOSIS >

3.CHECK TUBOCHARGER BOOST SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
2.

Turn ignition switch OFF and wait at least 20 seconds.
Check the continuity between turbocharger boost sensor harness connector and ECM harness connector.
Turbocharger boost sensor

ECM

Connector

Terminal

Connector

Terminal

F84

2

F85

17

Continuity
Existed

3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.

4.CHECK TUBOCHARGER BOOST SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.

Check the continuity between turbocharger boost sensor harness connector and ECM harness connector.
Turbocharger boost sensor

ECM

Connector

Terminal

Connector

Terminal

F84

1

F85

18

Continuity
Existed

2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.

5.CHECK INTERMITTENT INCIDENT
Refer to GI-39, "Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 6.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.

6.REPLACE TUBOCHARGER BOOST SENSOR
Replace turbocharger boost sensor.
>> GO TO 7.

7.PERFORM DTC CONFIRMATION PROCEDURE
Perform DTC CONFIRMATION PROCEDURE again. Refer to ECR-161, "DTC Logic".
Is 1st trip DTC P0235 displayed again?
YES >> GO TO 8.
NO
>> INSPECTION END

8.REPLACE ECM
1.
2.

Replace ECM.
Go to ECR-12, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement".
>> INSPECTION END

ECR-162