DTC P0193: Rail Pressure (RP) Sensor Circuit High Voltage Check the ''On Board Diagnostic (OBD) System Check''. Was the ''OBD System Check'' performed? YES – Go to step 2. NO – Go to OBD System Check. Check the DTC. Are there other DTCs P1627, P1618 (beside DTC P1092) being output? YES – Go to DTC P1627, P1618 chart (5 V reference #2 circuit failure). NO – Go to step 3. Check for the following conditions: Damaged the RP sensor. Is a problem found? YES – Repair as necessary. NO – Go to step 4. Turn the ignition switch OFF. Disconnect ECM connector. Measure the resistance of RP sensor as below. Between terminal 86 and 90. Is there about 0.9 – 1.3 kohms (At room temperature: about 20°C (68°F))? YES – Go to step 7. NO – Go to step 9. Turn the engine ON at idling.

Check the RP sensor signal voltage. Is about 1 V indicated? YES – Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the RP sensor and at the ECM. NO – Replace the RP sensor. Disconnect the RP sensor 3P connector terminals No. 1 and No. 2 with a jumper wire. Wire side of female terminals RP sensor 3P connector JUMPER WIRE Check the RP sensor signal circuit, +5 V circuit for open. Is a problem found? YES – Repair the RP sensor signal or +5 V circuit. NO – Go to step 11. aaa