P1558

Code

LAND ROVER P — Powertrain

Injector of cylinder 8 - circuit range / performance

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 16 EN: 49 RU: 20

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in injector wiring (pinch, chafing, corrosion)
Poor or intermittent connector contact at injector 8
Failed fuel injector (electrical or mechanical)
Faulty injector driver/transistor in the PCM
Poor ground or battery supply to injector rail
High resistance in harness or connector causing voltage drop

Symptoms

Ill‑running engine or vibration under load
Misfire on cylinder 8 (P0308) or rough idle
Reduced power, hesitations or stumble during acceleration
Check Engine Light (MIL) illuminated
Poor fuel economy or increased emissions
Possible increased injector noise or click change

What to check

Read stored freeze‑frame and live data; note RPM, load, fuel trim and misfire counters
Visual inspection of injector 8 wiring harness and connector for damage, corrosion, oil intrusion or loose pins
Check battery voltage and chassis/engine grounds
Measure injector coil resistance at the connector (compare to spec)
Back‑probe injector connector and monitor voltage while cranking and during commanded pulse
Use a noid light or oscilloscope on injector 8 to verify pulse presence and waveform shape

Signal parameters

Injector coil resistance: typical ranges vary by vehicle — low‑impedance injectors ~2–4 ohms, high‑impedance ~12–18 ohms (consult Land Rover spec for exact value)
Supply voltage at injector supply rail: approx. battery voltage (~11–14.5 V) with key on/crank
Injector driver output: near 0 V when driver is saturating to ground; open circuit near supply voltage when not commanded
Pulse width: 1–10 ms in normal running conditions (varies with load and RPM)
Oscilloscope waveform: clean square‑wave or switched waveform matching other cylinders (no excessive ringing, missing pulses, or clipped amplitude)

Diagnostic algorithm

Retrieve freeze frame and permanent data, note when fault set and any associated misfire codes.
Perform careful visual inspection of the harness and connector at cylinder 8. Repair any physical damage.
With ignition off, disconnect injector connector and measure injector coil resistance; compare to spec. Replace if out of range.
Reconnect. Back‑probe the connector while commanding injector ON (use active test or crank engine). Verify: battery supply present on supply pin, driver switches to ground on command, and waveform/pulse width are similar to other injectors.
Use a noid light or oscilloscope to confirm injector command and waveform quality. Compare to a known good cylinder.
If driver does not switch or waveform abnormal, swap injector with another cylinder and see if fault follows the injector or remains on cylinder 8 circuit.
Check continuity and insulation of the wiring from the injector connector back to the PCM; look for short to ground, short to battery, or high resistance/opens.
Verify PCM grounds and power supply circuits. Repair any poor grounds or supply issues.
If wiring and injector test good but fault persists, consider PCM driver failure; verify with manufacturer‑approved tests before replacing ECM (check for technical service bulletins/software updates).
Clear codes and perform road test or reproduce conditions to confirm repair.

Likely causes

Corroded or damaged connector at cylinder 8 injector
Injector coil failure (shorted or open)
Wire rubbed through to ground or shorted to battery
PCM driver fault (if wiring and injector test good)
Intermittent ground or supply due to loose mounting or broken terminal

Fault status

⚠️ Status

Injector circuit range/performance fault detected for cylinder 8 — electrical signal or performance outside expected limits. Inspect injector, wiring, connector, supply and PCM driver.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

Repair manuals

Manual library for LAND ROVER

413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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

P1558 — Injector of cylinder 8 - circuit range / performance