P1236 – Fuel Pump Relay Coil Circuit
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Symptoms
- No start
- Intermittent stall
- Long crank time
- Loss of power
- Check engine light
Causes
- Open relay coil
- Shorted coil
- Wiring damage
- Poor ground
- Control module driver fault
Diagnosis
- Check relay coil resistance
- Inspect wiring
- Check power and ground
- Scope driver signal
- Scan for related codes
Repair
- Replace relay
- Repair wiring
- Clean grounds
- Repair control module driver
- Secure connectors