DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 63 / 284

Symptom:
P0235-BOOST PRESSURE SENSOR SIGNAL VOLTAGE TOO HIGH
When Monitored and Set Condition:
P0235-BOOST PRESSURE SENSOR SIGNAL VOLTAGE TOO HIGH
When Monitored: With the ignition on.
Set Condition: The Boost Pressure Sensor Signal voltage exceeds 4.85 volts for at least 2
seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
BOOST PRESSURE SENSOR GROUND CIRCUIT OPEN
BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
BOOST PRESSURE SENSOR
POOR CONNECTOR TERMINAL CONTACT
ENGINE CONTROL MODULE (5-VOLT SUPPLY SHORTED TO VOLTAGE)
ENGINE CONTROL MODULE (INTERNAL)
ENGINE CONTROL MODULE (SENSOR SIGNAL SHORTED TO VOLTAGE)
TEST ACTION APPLICABILITY
1 NOTE: Ensure all turbocharger inlet and outlet tubes are connected prop-
erly, without damage and restriction before continuing with this test. Also
ensure the wastegate actuator and actuator rod are attached and function-
ing properly.
NOTE: If a P0243 DTC is present with this DTC, diagnose P0243 DTC before
continuing.
Turn the ignition on.
With the DRB, read the Boost Pressure Sensor voltage.
NOTE: Ensure the turbocharger wastegate is operating properly. This code
can be set if turbocharger boost pressure is too high.
Is the voltage above 4.85 volts? All
Yes
→
Go To 2
No
→
Go To 9
2 Turn the ignition off.
Disconnect the Boost Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage between ground and the Boost Pressure Sensor 5-volt Supply
circuit.
Is the voltage above 5.2 volts? All
Yes
→
Go To 3
No
→
Go To 4
55
DRIVEABILITY - DIESEL
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