Tank pressure sensor ME - fault code description - AD07.61-P-4000-21L
| Fuel tank pressure sensor | ||
| 1A | Fault code ( |
P201C Fuel tank pressure sensor, electrical fault(P0450) |
| 1B | Engines 112, 113 as of 1/01 | P201C-[1] Fuel tank pressure sensor, short circuit to positive (P0450) |
| Fault code | P201C-[2] Fuel tank pressure sensor, short circuit to ground (P0450) | |
| ( |
P201C-[4] Fuel tank pressure sensor, discontinuity (P0450) | |
| 2 | Fault storage | after expiry of test duration and fault |
| Actuation CHECK ENGINE (MIL) malfunction indicator lamp |
following two successive driving cycles with faults | |
| 3 | Checking frequency | Continuous |
| 4 | Checked signal or status | Tank pressure sensor signal |
| 5 | Fault setting conditions | |
| Short circuit to positive | Voltage greater than 4.7 V (equivalent to an approx. 35 mbar vacuum) | |
| Short circuit to ground/open circuit | Voltage less than 0.1 V (equivalent to an approx. -60 mbar vacuum) | |
| Checking duration | About 10 seconds per limit value | |
| Signal curve | The tank pressure must only pulse for enabled purging by a maximum of 2 mbar (approx. 0.1 V) otherwise the activated charcoal canister may be clogged. | |
| 6 | Check prerequisites | Idle speed |
| 7 | Checking runs independently of the leak test for purging. The fuel tank pressure sensor is checked for an electrical fault (discontinuity, short circuit to ground or positive). There is a fault if the sensor voltage exceeds or goes below the limits. | |
| Characteristic of the tank pressure sensor: - 50 mbar, about 0.5 volts; 0 mbar, about 3.0 volts; +30 mbar approx. 4.5 volts. | ||
| The fuel tank pressure sensor may be so faulty that the signal is constant but still plausible (sensor sticking). The fault: purging system has a gross leak (P2013) will be recognized in such cases. |