MX-5 Miata LS L4-1.8L DOHC (2001)
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Fuel Pressure: Component Tests and General Diagnostics
Fuel Pressure Test
FUEL LINE PRESSURE INSPECTION
WARNING: Fuel line spills and leakage are dangerous. Fuel can Ignite and cause serious injuries or death and damage. Always carry out the
following procedure with the engine stopped.
1. Complete the "BEFORE REPAIR PROCEDURE".
2. Disconnect the negative battery cable.
3. Disconnect the fuel pipe on the pulsation damper No.1 outlet side. Set the SST between the pulsation damper No.1 and the fuel distributor as
shown in the figure.
NOTE: Verify that a click is heard when the SST is pushed into pulsation damper No.1.
4. Pull the connector by hand and verify that it is installed securely. Visually inspect that the tabs of the retainer are securely fitted into the connector.
5. Connect the negative battery cable.
6. Verify that vehicles for AT is at N range and MT is at neutral position.
7. Start the engine and let it idle. Measure the fuel line pressure.
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If not as specified, inspect the following:
Zero or low
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FP circuit
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FP
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Main fuel line (clogged)
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Fuel leakage inside pressure regulator
High
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Pressure regulator for high pressure cause
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Return fuel line (clogged)
Fuel line pressure
370 - 420 kPa {3.7 - 4.3 kgf/sq.cm, 53 - 61 psi}
8. Observe the fuel pressure gauge indicator while heavy acceleration.
9. Verify that the fuel pressure fluctuation is within the specification during the test.
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If not as specified, inspect the following:
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PCM
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FP
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Fuel line for improper routing, kinks or leakage
Fuel pressure fluctuation
370 - 420 kPa {3.7 - 4.3 kgf/sq.cm, 53 - 61 psi}
10. Turn the ignition switch to the LOCK position.
11. Measure the fuel hold pressure after 5 min.
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If not as specified, inspect the following:
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FP hold pressure
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Fuel injector for leakage
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Fuel line for improper routing, kinks or leakage