P1641 - Fuel Pump Primary Circuit Malfunction
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P1641 - FUEL PUMP PRIMARY CIRCUIT MALFUNCTION
| Description: | - | ||
| Possible Causes: | - | ||
| Diagnostic Aids: | DTC is equivalent to P1235/P1236. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| LS, Thunderbird | GO to KB: Fuel Pump Driver Module STEP 23 | GO to KB: Fuel Pump Driver Module STEP 23 | GO to KB: Fuel Pump Driver Module STEP 23 |
| Dedicated NGV | GO to KC: Fuel Shutoff Valve Relay STEP 1 | GO to KC: Fuel Shutoff Valve Relay STEP 1 | GO to KC: Fuel Shutoff Valve Relay STEP 26 |
| F-Super Duty, Excursion, Expedition, Navigator | GO to KA: Fuel Pump Relay STEP 55 | GO to KA: Fuel Pump Relay STEP 55 | GO to KA: Fuel Pump Relay STEP 84 |
| All Others | GO to KA: Fuel Pump Relay STEP 1 | GO to KA: Fuel Pump Relay STEP 1 | GO to KA: Fuel Pump Relay STEP 40 |