Rail pressure is controlled by 1)only RPRV or 2)both RPRV and FPRV or 3)only RPRV depending on engine condition. These three modes are called ‘CPC mode’. During transition from one mode to another mode, if rail pressure is above the maximum rail pressure for each certain engine condition for more than 300ms. P1172 is set then, rail pressure is controlled by RPRV alone.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Signal monitoring | 1. ECM internal error 2. RPRV component 3. FPRV component 4. RPS componet | ||
Enable Conditions |
•
Engine running | |||
Threshold Value |
•
If rail pressure is below the minimum rail pressure for each certain engine condition | |||
Diagnostic Time |
•
0.3 sec | |||
Fail Safe | Fuel Cut | NO |
•
- | |
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | NO |