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Home >> Mazda >> 2004 >> MX-5 Miata L4-1.8L DOHC >> Repair and Diagnosis >> Powertrain Management >> Emission Control Systems >> Exhaust Gas Recirculation >> EGR Valve >> Testing and Inspection
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EGR Valve: Testing and Inspection

EGR VALVE INSPECTION

Resistance Inspection

NOTE: Perform the following test only when directed.

1. Disconnect the negative battery cable.




2. Inspect resistance of the EGR valve coils.
- If as specified, inspect the vacuum hoses for improper routing, kinks or leakage, and carry out "Circuit Open/Short Inspection".
- If not as specified, replace the EGR valve.

3. Remove the EGR valve, and inspect for any damage or clogging. If not as specified, replace the EGR valve.




4. Connect the negative battery cable.

Circuit Open/Short Inspection




Open circuit
- GND circuit (EGR valve connector terminal E and PCM connector terminal 2E)
- GND circuit (EGR valve connector terminal A and PCM connector terminal 2F)
- GND circuit (EGR valve connector terminal B and PCM connector terminal 2H)
- GND circuit (EGR valve connector terminal F and PCM connector terminal 2I)
- Power circuit (EGR valve connector terminal C or D and main relay connector terminal D through common connector)

Short circuit
- EGR valve connector terminal E and PCM connector terminal 2E to GND
- EGR valve connector terminal A and PCM connector terminal 2F to GND
- EGR valve connector terminal B and PCM connector terminal 2H to GND
- EGR valve connector terminal F and PCM connector terminal 2I to GND

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