DTC Troubleshooting: P1062 (95-13), P1064 (95-15)

DTC P1062: Fuel Rail Pressure Sensor Circuit High Voltage after Ignition On DTC P1064: Fuel Rail Pressure Sensor Circuit High Voltage after Ignition Off Check for a poor connection or damage at the fuel return line. Is the fuel return line OK?
YES | - | Go to Step 2 .
NO | - | Replace the fuel return line assembly, then go to Step 12 .
Turn the ignition switch ON (II). Clear the DTC with the DTC. Start the engine. Hold the engine speed at 2,000 rpm (min −1 ) without load (in neutral) until the radiator fan comes on, then let it idle. Turn the ignition switch OFF, and wait 30 seconds. Turn the ignition switch ON (II). Check for Temporary DTCs or DTCs with the HDS. Is DTC P1062 or P1064 indicated?
YES | - | Go to Step 8 .
NO | - | Intermittent failure, system is OK at this time.■
Disconnect the fuel return tube (A) from No. 1 cylinder, and connect a vacuum pump/gauge (B) to the tube. Apply vacuum to the tube. Does it hold vacuum?
YES | - | Replace the fuel return tube assembly, then go to Step 12 .
NO | - | Go to Step 10 .
Turn the ignition switch OFF. Replace the fuel rail. Turn the ignition switch ON (II). Reset the ECM with the HDS. Start the engine. Hold the engine speed at 2,000 rpm (min −1 ) without load (in neutral) until the radiator fan comes on, then let it idle. Turn the ignition switch OFF, and wait 30 seconds. Turn the ignition switch ON (II). Check for Temporary DTCs or DTCs with the HDS. Is DTC P1062 or P1064 indicated?
YES | - | If DTC P1062 or P1064 is indicated, check for poor connections or loose terminals at the FRP sensor and the ECM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | Go to Step 18 .
Monitor the OBD STATUS for DTC P1062 or P1064 in the DTCs MENU with the HDS. Does the screen indicate PASSED?
YES | - | Troubleshooting is complete.■
NO | - | If the screen indicates FAILED, check for poor connections or loose terminals at the FRP sensor and the ECM, then go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 14 and recheck.