Test C3 - Fuel Pressure Regulator Control (PRC)
| Circuit | Breakout Box Pin | ECA Pin | |
|---|---|---|---|
| 2.2L MTX Non-Turbo | |||
| PRC | 11 | 2T | |
| VPWR | 37, 57 | 1B | |
| 2.2L Except MTX Non-Turbo | |||
| PRC | 21 | 3M | |
| VPWR | 37, 57 | 1B | |
1) Checking System Integrity Visually check all wiring, harnesses, connectors and components for evidence of damage, overheating, shorting or looseness. If a fault is found, repair as necessary. If no faults are found, go to next step.
2) Checking Solenoid Function Install breakout box and leave ECA disconnected. Turn ignition on. Apply vacuum to fuel pressure regulator. Vacuum should hold. Jumper breakout box PRC test pin to ground. See PRC CIRCUIT PIN IDENTIFICATION . If vacuum releases, solenoid is functioning okay. Fault is in another circuit or ECA. If vacuum is held, go to step 3.
3) Check Voltage To PRC Solenoid Disconnect PRC solenoid connector. With ignition on, measure voltage between VPWR (Red/Black) wire and ground. If voltage reading is less than 10 volts, repair VPWR (Red/Black) wire to fuel pump relay. If voltage reading is than 10 volts, go to step 4.
4) Warm to operating temperature. Turn engine off. Measure voltage between solenoid VPWR and PRC (White/Black) wire while cranking engine. Replace solenoid if voltage is more than 10 volts. If voltage is less than 10 volts, go to next step.
5) PRC Circuit Continuity Check With breakout box installed and ECA disconnected, remove solenoid connector. Check for continuity between breakout box pin and connector terminal. See PRC CIRCUIT PIN IDENTIFICATION . If continuity does not exist, repair wire between solenoid connector and ECA.
6) If continuity is present, check for continuity between PRC breakout box pin and all other test pins. If continuity is found between PRC test pin and another test pin(s), PRC wire is shorted to that circuit. Repair as necessary and recheck circuit. If all circuits are okay, replace ECA.