DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

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Symptom:
P0190-FUEL PRESS SENSOR CIRCUIT MALF SUPPLY VOLTAGE
TOO HIGH OR LOW
When Monitored and Set Condition:
P0190-FUEL PRESS SENSOR CIRCUIT MALF SUPPLY VOLTAGE TOO HIGH OR
LOW
When Monitored: With the ignition on.
Set Condition: The Fuel Pressure Sensor 5-Volt Supply voltage is below 4.9 volts or above
5.1 volts for 100 ms.
POSSIBLE CAUSES
CHECK FOR SENSOR REFERENCE VOLTAGE A CIRCUIT DTCS
ENGINE CONTROL MODULE
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.
Turn the ignition on.
With the DRB, read ECM DTCs.
Is the High or Low DTC for P0641 SENSOR REFERENCE VOLTAGE A CIRCUIT
set with this DTC? All
Yes
→
Refer to the symptom list for the related symptom(s).
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
46
DRIVEABILITY - DIESEL
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