MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Fuel Injector: Component Tests and General Diagnostics
Fuel Injector Inspection
FUEL INJECTOR INSPECTION
On-vehicle Inspection
1. Warm up the engine and idle it.
2. Listen for operation sound of each fuel injector with a screwdriver or a soundscope.
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If no sound is heard, perform the "Fuel Injector Resistance Inspection".
NOTE: The best way to judge the performance of a fuel injector is to compare its sound with the sound of other fuel injectors.
Resistance Inspection
NOTE: Perform the following test only when directed.
1. Disconnect the fuel injector connectors.
2. Measure the resistance of the fuel injector using an ohmmeter.
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If as specified but the On-vehicle Inspection failed, perform the "Circuit Open/Short Inspection".
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If not as specified, replace the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION.)
Resistance: 12 - 13 ohms [20 °C {68 °F}]
Circuit Open/Short Inspection
Open circuit
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GND circuit (No.1 cylinder fuel injector connector terminal B and PCM connector terminal 2A)
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GND circuit (No.2 cylinder fuel injector connector terminal B and PCM connector terminal 2D)
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GND circuit (No.3 cylinder fuel injector connector terminal B and PCM connector terminal 2G)
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GND circuit (No.4 cylinder fuel injector connector terminal B and PCM connector terminal 2J)
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Power circuit (No.1 cylinder fuel injector connector terminal A and main relay connector terminal D through common connector)
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Power circuit (No.2 cylinder fuel injector connector terminal A and main relay connector terminal D through common connector)
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Power circuit (No.3 cylinder fuel injector connector terminal A and main relay connector terminal D through common connector)
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Power circuit (No.4 cylinder fuel injector connector terminal A and main relay connector terminal D through common connector)
Short circuit
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No.1 cylinder fuel injector connector terminal B and PCM connector terminal 2A to GND
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No.2 cylinder fuel injector connector terminal B and PCM connector terminal 2D to GND
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No.3 cylinder fuel injector connector terminal B and PCM connector terminal 2G to GND
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No.4 cylinder fuel injector connector terminal B and PCM connector terminal 2J to GND
