DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 52 / 284

Symptom:
P0190-FUEL PRESS SENSOR CIRCUIT MALF SIGNAL VOLTAGE
TOO LOW
When Monitored and Set Condition:
P0190-FUEL PRESS SENSOR CIRCUIT MALF SIGNAL VOLTAGE TOO LOW
When Monitored: With the ignition on.
Set Condition: The Fuel Rail Pressure Sensor Signal voltage is below 0.2 volt.
POSSIBLE CAUSES
FUEL PRESSURE SENSOR
INTERMITTENT CONDITION
FUEL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
FUEL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
ECM - FUEL PRESSURE SENSOR SIGNAL SHORTED TO GROUND
TEST ACTION APPLICABILITY
1 WARNING: THE FUEL INJECTION PUMP SUPPLIES HIGH-PRESSURE
FUEL TO EACH INDIVIDUAL INJECTOR THROUGH HIGH-PRESSURE
FUEL LINES. FUEL UNDER HIGH PRESSURE CAN PENETRATE SKIN
AND CAUSE PERSONAL INJURY. WEAR SAFETY GOGGLES AND ADE-
QUATE PROTECTIVE CLOTHING.
NOTE: If DTC P0641 or P0651 is present with this DTC, diagnose DTCs
P0641 and P0651 before diagnosing this DTC.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Cycle the ignition key on and off several times, leaving the key on for at least 10
seconds at a time.
With the DRB, read ECM DTCs.
Did this DTC set again? All
Yes
→
Go To 2
No
→
Go To 6
2 Turn the ignition off.
Disconnect the Fuel Pressure Sensor harness connector.
Measure the voltage of the Fuel Pressure Sensor Signal circuit.
Is the voltage between 4.7 and 5.3 volts? All
Yes
→
Replace the Fuel Pressure Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To 3
44
DRIVEABILITY - DIESEL
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