Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1993 BMW 525iTFACTORY OEM SERVICE PROCEDURE
Engine Controls - System/Component Tests: Specifications
RESISTANCE SPECIFICATIONS 525i (2.5L M50 ENGINE
| Component | Ohms | ||
|---|---|---|---|
| Mass Air Sensor | |||
| Between Terminals No. 5 & 6 | 3-4 | ||
| Between Terminals No. 1 & 5 | 16,300 | ||
| Camshaft Sensor | 1.3-1.5 | ||
| Crankshaft (Speed/Position Pulse) Sensor | 490-590 | ||
| Engine (Coolant) Temperature Sensor | |||
| 9-19°F (-13 to -7°C) | 8260-10,560 | ||
| 63-73°F (17-23°C) | 2200-2700 | ||
| 171-181°F (77-83°C) | 290-364 | ||
| Fuel Evaporation Control Solenoid | 40-50 | ||
| Fuel Injector | 15-17 | ||
| Idle Speed Control Valve (Per Winding) | 20-25 | ||
| Ignition Coil (Primary) | 0.8 | ||
| Intake Air Temperature Sensor | |||
| 63-73°F (17-23°C) | 2200-2700 | ||
| 117-127°F (47-53°C) | 760-910 | ||
| Throttle Position Sensor (TPS) | 4600 | ||
| - Measured at an ambient air temperature of 64-82°F (18-28°C). | |||
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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