Code
P1298
INFINITI
P — Powertrain
Electrical Load Detector Circuit High Voltage
Views:
UK: 26
EN: 62
RU: 47
AI status
Completed
Completed
100%
Causes
- Wiring shorted to battery positive (B+) on the ELD signal circuit
- Corroded, loose or damaged ELD connector or pins
- Faulty Electrical Load Detector sensor/module
- Poor or missing ground(s) in ELD/ECM circuits
- Faulty alternator/regulator producing excessive voltage
- Battery overvoltage condition or defective battery
Symptoms
- Charge-system warning light or battery lamp illuminated
- Erratic charging voltage readings on a scan tool
- Reduced fuel economy or drivability issues under some conditions
- Electrical accessories operating abnormally
- DTC P1298 stored and possibly other charging/system voltage codes present
- Possible illumination of MIL (Check Engine Light)
What to check
- Scan for stored codes and freeze-frame data; note battery/charging voltage and ELD signal values
- Visually inspect ELD harness and connector for damage, corrosion, melting, or exposed wires
- Inspect battery condition and terminal connections; verify proper battery voltage with engine off (~12.4–12.8 V)
- With engine running, measure system voltage at battery and alternator output (should be near ~13.5–14.8 V depending on vehicle)
- Backprobe the ELD signal wire at the connector; measure DC voltage to ground with key on and engine running
- Check for a short to B+ by measuring resistance between ELD signal and battery positive (with battery disconnected if required by procedure)
Signal parameters
- Typical ELD signal: low-voltage analog signal proportional to electrical load (commonly in the ~0.5–4.5 V range under normal conditions)
- High-voltage fault threshold: ELD signal exceeding expected maximum (often above ~5.0 V or approaching battery voltage) triggers P1298
- Battery resting voltage (key off): ~12.4–12.8 V expected
- Charging voltage (engine running): commonly ~13.5–14.8 V depending on vehicle and conditions
Diagnostic algorithm
- Retrieve and record all stored codes, freeze-frame and live data (ELD signal, battery voltage, alternator output). Clear codes and attempt to reproduce.
- Visually inspect ELD connector, wiring harness, nearby components and grounds for damage, corrosion or aftermarket taps. Repair any obvious wiring/connectivity issues.
- With a reliable DVOM, backprobe the ELD signal wire at the connector. Measure signal voltage with key ON (engine OFF) and engine RUNNING at idle and under load (turn on headlights/A/C). Compare to expected ranges.
- Check for short to B+: disconnect ELD connector and measure resistance between the signal pin and battery positive. If low resistance or direct connection, repair wiring harness and isolate short.
- Verify alternator/regulator operation: measure charging voltage at battery and alternator terminal at idle and during load. If charging voltage is abnormally high, diagnose/replace alternator or regulator per service manual.
- Inspect/clean/repair grounds for ELD and ECM. Re-test signal and codes after repairs.
- If wiring and charging system check OK and abnormal ELD voltage remains, bench-test or replace the ELD sensor/module per manufacturer instructions. After replacement, clear codes and road-test to verify.
- If problem persists after replacing ELD, suspect ECM input fault; perform ECM diagnostics or replacement as per dealer procedures.
Likely causes
- Short to B+ on ELD signal wiring (most common)
- Damaged ELD connector or harness causing intermittent high reading
- Faulty ELD module (internal failure)
- Alternator/regulator producing voltages above normal range
Fault status
Status
Stored when the ELD circuit reports a voltage higher than the expected operating range for a defined detection period. May set MIL and store related freeze-frame data. Further diagnosis required to isolate wiring, sensor, charging system, or ECM issues.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email