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.
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HOMESERVICE MANUALSMAZDA1999MX-5 MIATA L4-1.8L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCRANKSHAFT POSITION SENSORTESTING AND INSPECTION
1999 Mazda MX-5 Miata L4-1.8L DOHC
Crankshaft Position Sensor: Testing and Inspection
1999 Mazda MX-5 Miata L4-1.8L DOHCSECTION Testing and Inspection
Inspection of Air Gap
NOTE:
- Perform the following test only when detected.
1. Measure the air gap between each four projections of the plate behind the crankshaft pulley and the crankshaft position sensor by using a feeler gauge. If not as specification, adjust the crankshaft position sensor air gap and inspect as follows:
- Is any of the four projections of the plate behind the crankshaft pulley twisted or bent.
Specification: 0.5-1.5 mm (0.020-0.059 in)
2. If not as specified, replace the plate behind the crankshaft pulley or crankshaft position sensor.
If crankshaft position sensor PID value is out of specification, inspect as follows:
Open circuit
- Crankshaft position circuit (Crankshaft position sensor connector terminal B and PCM connector terminal 2J.)
- Power circuit (Crankshaft position sensor connector terminal A and main relay terminal D through common connector.)
- Ground circuit (Crankshaft position sensor connector terminal C and PCM connector terminal 3C through common connector.)
Short circuit
- Crankshaft position sensor connector terminal B and PCM connector terminal 2J circuit through common connector to ground.
- Crankshaft position sensor connector terminal A and main relay terminal D through common connector to ground.
3. Reconnect the crankshaft position sensor connector.
NOTE:
- Perform the following test only when detected.
1. Measure the air gap between each four projections of the plate behind the crankshaft pulley and the crankshaft position sensor by using a feeler gauge. If not as specification, adjust the crankshaft position sensor air gap and inspect as follows:
- Is any of the four projections of the plate behind the crankshaft pulley twisted or bent.
Specification: 0.5-1.5 mm (0.020-0.059 in)
2. If not as specified, replace the plate behind the crankshaft pulley or crankshaft position sensor.
If crankshaft position sensor PID value is out of specification, inspect as follows:
Open circuit
- Crankshaft position circuit (Crankshaft position sensor connector terminal B and PCM connector terminal 2J.)
- Power circuit (Crankshaft position sensor connector terminal A and main relay terminal D through common connector.)
- Ground circuit (Crankshaft position sensor connector terminal C and PCM connector terminal 3C through common connector.)
Short circuit
- Crankshaft position sensor connector terminal B and PCM connector terminal 2J circuit through common connector to ground.
- Crankshaft position sensor connector terminal A and main relay terminal D through common connector to ground.
3. Reconnect the crankshaft position sensor connector.
RENDER: 1.0x
NO RELATED
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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.