2007 Compass Patriot MK Factory Service Manual 9 - ENGINE

P0236-BOOST PRESSURE SENSOR PERFORMANCE





For a complete wiring diagram Refer to Section 8W



Possible Causes
 
(K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT OPEN
 
(K656) BOOST PRESSURE SENSOR GROUND CIRCUIT OPEN
 
(K854) BOOST PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT OPEN
 
INTAKE AIR TEMPERATURE/BOOST PRESSURE SENSOR
 
ENGINE CONTROL MODULE
 




Diagnostic Test

1. CHECK FOR ACTIVE DTC

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.


NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.


Turn the ignition on.
With the scan tool, erase ECM DTCs.
Turn the ignition off, wait 30 seconds, then start and idle the engine for at least 30 seconds.
With the scan tool, read ECM DTCs.

Did this DTC set again?

Yes


No

2. (K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT OPEN



Turn the ignition off.
Disconnect the Intake Air Temp/Boost Pressure Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the (K37) Boost Pressure Sensor Signal circuit between the Intake Air Temp/Boost Pressure Sensor harness connector and the ECM harness connector.

Is the resistance below 10.0 ohms?

Yes


No

3. (K656) BOOST PRESSURE SENSOR GROUND CIRCUIT OPEN



Measure the resistance of the (K656) Boost Pressure Sensor Ground circuit between the Intake Air Temp/Boost Pressure Sensor harness connector and the ECM harness connector.

Is the resistance below 10.0 ohms?

Yes


No

4. (K854) BOOST PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT OPEN



Measure the resistance of the (K854) Boost Pressure Sensor 5-Volt Supply circuit between the Intake Air Temp/Boost Pressure Sensor harness connector and the ECM harness connector.

Is the resistance below 10.0 ohms?

Yes


No

5. INTAKE AIR TEMPERATURE/BOOST PRESSURE SENSOR

Replace the Intake Air Temperature/Boost Pressure Sensor.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Test drive the vehicle, pausing several times to cycle the ignition.
Monitor the scan tool for ECM DTCs.

Did this DTC set again?

Yes


No