P1298 eld voltage hign - 2004 Honda Civic

Electric Load Detector Circuit High Voltage

Possible causes - Faulty Electronic Load Detector Unit - Faulty Engine Control Module (ECM) - Electronic Load Detector Unit harness is open or shorted - Electronic Load Detector Unit circuit poor electrical connection
Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light)
P1298 Honda Description The Electric Load Detector (ELD) measures the main current flow and sends that signal to the Engine Control Module (ECM) to command the alternator charging system to get fuel efficiency and decrease the drag of the engine when starting.

P1298 code is for Electric Load Detector (ELD) Circuit High Voltage

CODE P1298. ELD Circuit High Voltage.
Possible causes:
- 7.5 Amp fuse in under the dash fuse/ relay box.
- Repair open wire between 7.5 Amp fuse and ELD.
- Check for open wire between ECM/ PCM and ELD.
- Substitute a good-known ECM/ PCM and then recheck.

P1298
Electric Load Detector (ELD) Circuit High Voltage
-ELD ground wire open or short.
- Wiring harness
- ECM
P1706
Open in Transmission Range Switch Circuit
- Wiring harness.
- Transmission range switch maladjusted.
- Transmission range switch defective.

P1298 Electric Load Detector (ELD) Circuit High Voltage.
Fault:
- Check the No. 3 (7.5 A) fuse in the under-dash fuse/relay box.
- Wiring.
- ECM.

P0325 Knock Sensor 1 Circuit (Bank 1 or Single Sensor)
P1298 IDM Failure

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Multi-Diag Access J2534

Hi,


P1289 - Cylinder Head Temp Sensor High Input
The A/F sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element.

The sensor is capable of precise measurement a= 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide range (0.7 < a< air).

The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.

An electronic circuit controls the pump current through the oxygen-pump cell so that the composition of the exhaust gas in the diffusion gap remains constant at a = 1. Therefore, the A/F sensor is able to indicate air/fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800?C (1,292 - 1,472?F).

The response (from LEAN to RICH) of the A/F (Bank 1) signal computed by ECM from A/F sensor 1 signal takes more than the specified time.

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes
# Harness or connectors (The A/F sensor 1 circuit is open or shorted.)
# Air fuel ratio (A/F) sensor 1
# Air fuel ratio (A/F) sensor 1 heater
# Fuel pressure
# Fuel injector
# Intake air leaks
# Exhaust gas leaks
# PCV
# Mass air flow sensor



Thank you.

P1298 is a result of a alternator wire short. check fuse 6 in the driver's under dash fuse panel and see if it is blown. If it is check the black/yellow wire of the alternator and see if it is shorted to ground. repair the wire and replace the fuse. Also you might get the O2 sensor code as a result of this fuse being blown also.

Are you sure you wrote the correct code. According to Honda, P1298 is a high ELD circuit voltage. If what I just put is correct, Honda has a service bulletin as this is a common problem( it could be another fault, but this is the most likely choice).
The ELD has a bad solder joint. I have done several of these, you will need to replace the ELD, and this is how.

1 D/C the negative battery cable (make sure you know your radio code, it will be needed to use the radio again)
2 Unbolt the fuse box that is in the engine bay.
3 Attached to the fuse box underneath there is a plastic cover, remove this cover.
4 There is a 3 pin connector under this cover. Remove it
5 Flip the fuse box back over, there are 2 big fuses bolted down, a 40 A and a 80A
6 Under these fuses is the ELD, remove it and pull the bar that sticks out of it.
7 Stick the bar in the new ELD
8 Put everything back together. Do the idle learn (just idle the car for 10 minutes with no loads on such as radio, headlights etc..)


This is probably the first thing they will do if you bring it to Honda assuming the code you have is P1298.

OK. Here's how to diagnose the P1298 error.

DTC P1298: ELD Circuit High Voltage

1. Reset the ECM/PCM (see HOW TO RESET THE ECM/PCM ).
2. Start the engine.
3. Turn on the headlights.

Is DTC P1298 indicated?

YES - Go to step 4.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ELD and at the ECM/PCM.

4. Turn the ignition switch and headlights OFF.
5. Disconnect the ELD 3P connector.
6. Turn the ignition switch ON (II).
7. Measure voltage between body ground and ELD 3P connector terminal No. 1.

Is there battery voltage?

YES - Go to step 8.
NO - Check the No. 4 ACG (10A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 4 ACG (10A) fuse and the ELD.

8. Turn the ignition switch OFF.
9. Connect ELD 3P connector terminal No. 3 to body ground with a jumper wire.

10. Disconnect ECM/PCM connector E (31P).
11. Check for continuity between body ground and ECM/PCM connector terminal E15.

Is there continuity?

YES - Go to step 12.
NO - Repair open in the wire between the ECM/PCM (E15) and the ELD.

12. Check for continuity between ELD 3P connector terminal No. 2 and body ground.

Is there continuity?

YES - Go to step 13.
NO - Repair open in the wire between ELD and G201.

13. Reconnect the ELD 3P connector and ECM/PCM connector E (31P).
14. Start the engine and let it idle.
15. While measuring voltage between ECM/PCM connector terminals A24 and E15, turn the headlights on (high).

Does the voltage drop?

YES - Update the ECM/PCM if it does not have the latest software, or
substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
NO - Replace the ELD.