Mazda RX-8 Manual page 221

Investigate the GND system for hall or piezo-electric type
Confirm that terminal sensor #5 is at 0 V .
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If it is at 0 V , inspect the sensor.
If necessary, replace the sensor.
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If not, inspect for the following:
Open or short circuit in wiring harness
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Female terminal opening is loose causing an open or short circuit in wiring harness
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Coupler (pin holder) damage
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Pin discoloration (blackness)
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Wiring harness/pin crimp is loose or disconnected.
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Hot wire type (fuel tank level sensor and mass air flow (MAF) sensor)
Investigate the GND system for hot wire type
Confirm that terminal sensor #4 is at 0 V .
•
If it is at 0 V , inspect the sensor.
If necessary, replace the sensor.
•
If not at 0 V , inspect for the following:
Open circuit in wiring harness
•
Female terminal opening is loose.
•
Coupler (pin holder) damage
•
Pin discoloration (blackness)
•
Wiring harness/pin crimp is loose or disconnected.
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Investigate the input signal system for hot wire type
1. When you get an unusual signal, measure the #1 PCM terminal voltage.
If the #1 terminal voltage and the WDS or equivalent monitor voltage are the same, proceed to
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the next step.
If there is a difference of 0.5 V or more , inspect for the following points concerning the PCM
•
connector:
Female terminal opening is loose.
Coupler (pin holder) damage
Pin discoloration (blackness)
Wiring harness/pin crimp is loose or disconnected.
2. Measure the #2 sensor terminal voltage.
(w) RX8-Engine Troubleshooting
Page 172