| Parameter | Normal | Fault indication | |-----------|--------|------------------| | Desired fuel pressure (bar) | 250-1600 | – | | Actual fuel pressure (bar) | Should track desired | Stuck low or erratic | | PCV duty cycle (%) | 20-80% | 0% or 100% stuck | | Rail pressure vs. desired deviation | < 50 bar | Large mismatch |
If desired and actual pressure differ greatly but PCV command is not saturated → suspect or low-pressure fuel system .
| Test | Measurement | Good value | |------|-------------|-------------| | Resistance across regulator pins (solenoid) | Ω | 2.5 – 5.0 Ω (varies by engine, typically ~3Ω) | | Resistance from each pin to chassis ground | Ω | Infinite (OL) – if low, internal short | | Voltage on harness pins (ignition ON) | V | Pin 1: ~0V (ECU ground). Pin 2: ~0V but should have reference voltage? No – it's a PWM drive. Better test: continuity to ECU. | | Continuity from harness to ECU pin | Ω | < 1Ω per wire |
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