Obd2 code p1298

[JimmyD454]

Hi, I have a 2001 Honda civic ex. It idles rough and been gettin the check engine light. Hooked up the obd2 sensor reader and got p1298 and p0300, p0301, p0302 twice. I know they r misfires but could the p1298 and the p0300s b related?

[Jeff Collision]

The trouble code P1298 is for the Electric Load Detection (ELD) circuit. The ELD unit is built into the under hood fuse box and works like an electronic Throttle Position Sensor (TPS) and monitors current flow so the Engine Control Module (ECM) can control the charging system.

1. Verify that the Black (BLK) wire is ground, the Black/Orange (BLK/ORG) wire has battery voltage and the Green/Red (GRN/RED) wire from the ECM should have 4.5 to 5 volts reference voltage, unplugged.

2. With the connector plugged into the fuse box and the vehicle running, as electrical loads are turned on, the voltage on the GRN/RED wire should drop. Normal voltage is 3 volts no load and 1.5 volts high load. The voltage always stayed at 4.5 volts. The ELD is not changing the voltage, so the ELD is faulty and will need to be replaced.

The code P0300 is for problem in cylinder 3. It's either a bad ignition wire or fuel injector since its cylinder 3. The other issue could be is a valve issue either too tight or possible burnt. A compression test and cylinder leak down test would need to be done to check that. The ignition wire is bad or fuel injector and stat there.