If you suspect a problem with the subfuel pump, check that the subfuel pump actually runs; when it is on, you will hear some noise if you listen to the subfuel fill port with the subfuel fill cap removed. The subfuel pump should run for 2 seconds when the ignition switch is first turned on. If the subfuel pump does not make noise, check as follows:
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Turn the ignition switch to LOCK (0).
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Turn the ignition switch to ON (II).
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Measure the voltage between the subfuel pump relay 4P connector terminals No. 2, No.4 and body ground individually.
Is there battery voltage?
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YES
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NO
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Repair open in the wire between the subfuel pump relay and the auxiliary under-dash fuse holder (15 A) fuse. Also replace the auxiliary under-hood fuse box (15 A) fuse.■
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Repair open in the wire between the auxiliary under-dash fuse holder (15 A) fuse and the ignition switch.■
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Turn the ignition switch to LOCK (0).
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