Dodge Caliber. Manual — part 938
P0237-TURBO BOOST PRESSURE SENSOR CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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•
When Monitored:
With the ignition on.
•
Set Condition:
The (K37) Boost Pressure Sensor Signal circuit voltage is below 0.68 volt for 0.48 second.
Possible Causes
INTERMITTENT DTC
(K854) BOOST PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
(K854) BOOST PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO (K656) BOOST PRESSURE
SENSOR GROUND
(K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO (K656) BOOST PRESSURE SENSOR
GROUND
(K854) BOOST PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE
(K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
INTAKE AIR TEMPERATURE/BOOST PRESSURE SENSOR
ENGINE CONTROL MODULE (ECM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
Monitor the scan tool for at least two minutes.
Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time.
Start the engine.
Allow the engine to reach normal operating temperature.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
PM
2.
(K854) BOOST PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT VOLTAGE
Turn the ignition off.
Disconnect the Intake Air Temp/Boost Pressure Sensor harness connec-
tor.
Turn the ignition on.
Measure the voltage of the (K854) Boost Pressure Sensor 5 Volt Supply
circuit in the Intake Air Temp/Boost Pressure Sensor harness connector.
Is the voltage above 4.5 volts?
Yes
>> Go to 6
No
>> Go to 3
3.
(K854) BOOST PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the Engine Control Module (ECM) harness connector.
Measure the resistance between ground and the (K854) Boost Pressure
Sensor 5 Volt Supply circuit in the Intake Air Temp/Boost Pressure Sen-
sor harness connector.
Is the resistance above 1000 ohms?
Yes
>> Go to 4
No
>> Repair the (K854) Boost Pressure Sensor 5 Volt Supply cir-
cuit for a short to ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
4.
(K854) BOOST PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO (K656) BOOST PRESSURE
SENSOR GROUND CIRCUIT
Measure the resistance between the (K854) Boost Pressure Sensor 5
Volt Supply circuit and the (K656) Boost Pressure Sensor Ground circuit
in the Intake Air Temp/Boost Pressure Sensor harness connector.
Is the resistance above 1000 ohms?
Yes
>> Go to 5
No
>> Repair the (K854) Boost Pressure Sensor 5 Volt Supply cir-
cuit for a short to the (K656) Boost Pressure Sensor
Ground circuit.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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5.
(K854) BOOST PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the (K854) Boost Pressure Sensor 5 Volt
Supply circuit between the Intake Air Temp/Boost Pressure Sensor har-
ness connector and the Engine Control Module (ECM) harness connec-
tor.
Is the resistance below 10.0 ohms?
Yes
>> Go to 10
No
>> Repair the (K854) Boost Pressure Sensor 5 Volt Supply cir-
cuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
6.
INTAKE AIR TEMPERATURE/BOOST PRESSURE SENSOR
With the scan tool, Clear DTCs.
With the scan tool, select View DTCs.
NOTE: The scan tool should display a Boost Pressure Sensor high voltage or open DTC with the Boost
Pressure Sensor connector disconnected.
Does the scan tool display the DTC(s) as described above?
Yes
>> Replace the Intake Air Temp/Boost Pressure Sensor in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Go to 7
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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