P0091 is set when "0"A in control circuit of PRV (integrated with common rail) is detected for more than specified duration. This code is due to open or short to ground in control circuit or PRV internal open.
Item | Detecting Condition | Possible Cause | |||
DTC Strategy |
•
Voltage monitoring | 1. PRV circuit 2. PRV | |||
Enable Conditions |
•
IG key ON | ||||
Case 1 | Threshold Value |
•
Short to ground in PRV control circuit. | |||
Diagnostic Time |
•
220ms | ||||
Case 2 | Threshold Value |
•
Open in PRV control circuit. - Engine Shut off. | |||
Diagnostic Time |
•
280ms | ||||
Fail Safe | Fuel cut | YES |
•
- | ||
EGR Off | NO | ||||
Fuel Limit | ON | ||||
Check Lamp | ON | ||||
