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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 490 (Powertrain Diagnostic Procedures - Diesel) >> Diagnostic Information And Procedures >> DRIVEABILITY - Diesel - Diagnostic Tests >> P1202-Fuel System Over Pressure - Regulator Stuck >> Diagnostic Procedure

Diagnostic Procedure

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FUEL SYSTEM OVER PRESSURE - REGULATOR STUCK1

TEST ACTION APPLICABILITY
1
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 DRB IIIt 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 DRBIII®, erase the ECM DTCs.
Test drive the vehicle under various load and speed conditions to attempt to duplicate the fault.
With the DRBIII®, read the ECM DTCs.
Does the DRBIIIt display this DTC?
Yes --> Go to 2
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Go To 3		 All
2 Inspect the entire Fuel Return System for debris, kinks, damaged lines or other problems that may restrict proper fuel return to the fuel tank.
Were there any problems with the Fuel Return System?
Yes --> Repair as necessary in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Replace the Fuel Pressure Solenoid in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .		 All
3
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition.
 With the engine running at normal operating temperature, monitor the DRB parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Were any of the above conditions present?
Yes --> Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Test Complete.		 All
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