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P1298 ELD circuit voltage high

Fix P1298 ELD circuit voltage high on Honda

Honda vehicles are equipped with an electric load detector (ELD) P1298, Honda ELD, 38255-S5A-003that measures the load on the charging system and can set a P1298 ELD circuit voltage high when there’s a problem. The ELD sends a signal to the ECM which controls the voltage regulator and adjusts field coil voltage to match the load. The ELD reduces field coil voltage during low load periods to increase fuel economy.

On May 6, 2005 Honda issued a service bulletin #05-006 to address the issue a P1298 ELD circuit voltage high trouble code. The service bulletin advises that Honda has discovered a faulty solder joint on the ELD and recommends replacement with an updated part #38255-S5A-003, H/C 7987571.

Before you replace the part, conduct the following P1298 ELD circuit high voltage tests:

1) Reset the ECM. Then start the engine and turn on the headlights. If the ELD circuit high voltage does not set, the problem is intermittent.

2) To test the ELD, disconnect the electrical connector. Then check for continuity between terminal #1 and ground. If no continuity, there’s an open between the ELD and ground.

3) Next, check for continuity between terminal #3 and ECM terminal D16. If no continuity, check for open in that wire.

4) Start engine and allow it to idle. Check voltage between ECM terminals A9 and D16. Then turn on headlights. If the voltage does NOT drop, replace the ELD. If voltage does drop, the problem is in the ECM.

The P1298 ELD circuit high voltage exits in these vehicles:

P1298 ELD circuit voltage high Honda Civic
P1298 ELD circuit voltage high Honda Acura
P1298 ELD circuit voltage high Honda CRV
P1298 ELD circuit voltage high Acura RSX

©, 2015 Rick Muscoplat

Posted on by Rick Muscoplat

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