P1589

Code

LAND ROVER P — Powertrain

accelerator unable to control desired accelerator angle of control distance signal Increase

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 15 EN: 29 RU: 15

AI status

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Page language: EN

Causes

Faulty accelerator pedal position module (APM) or sensors
Faulty electronic throttle body / throttle actuator motor
Wiring fault (open, short, corrosion) between pedal, throttle body and ECU
Poor or intermittent ground or battery voltage issues
Throttle linkage or bore binding (mechanical obstruction)
ECM/TCU software error or internal fault

Symptoms

MIL / Check Engine lamp illuminated
Reduced engine power or limp-home mode
Delayed or no throttle response to pedal input
Surging or erratic idle when throttle position is commanded
Stored related throttle/pedal position diagnostic trouble codes

What to check

Read and record freeze frame and all related DTCs; note if codes return after clearing
Scan live data: accelerator pedal position sensors (both channels), throttle valve/plate actual position, and requested throttle position
Compare pedal position vs requested throttle vs actual throttle position while operating pedal
Check battery voltage and ground integrity with engine cranking and at idle
Visually inspect connectors and wiring for corrosion, damage, pin push‑outs, water ingress
Perform wiggle test on wiring and connectors while monitoring live data for intermittent changes

Signal parameters

Accelerator pedal sensor 1 & 2 voltage/signals (typically 0–5 V range; two independent channels expected to correlate)
Throttle valve actual position (degrees or percentage) and commanded/requested position
Supply voltage to throttle actuator (nominal battery voltage ~12 V) and ground continuity
CAN or serial bus messages for throttle/pedal data (if applicable) to detect bus errors
Fault code set counters and freeze frame data (engine speed, load, temp when fault occurred)

Diagnostic algorithm

Connect a factory-level scan tool and read all DTCs and freeze frame data. Note related throttle/pedal codes.
Clear codes and attempt to repeat the symptom while monitoring live data (pedal sensor channels, requested throttle, actual throttle).
With ignition on (engine off) and then with engine running, verify pedal sensor 1 vs sensor 2 correlation across full travel. Look for dropouts, non‑linearity or mismatch.
Command throttle open/close with a compatible scan tool and observe actual throttle plate movement and current draw of actuator. If throttle does not follow commands, suspect actuator or mechanical bind.
Measure voltages: pedal sensors outputs, throttle actuator power feed, and grounds. Check for high resistance in power/ground circuits.
Inspect and backprobe connectors at pedal module, throttle body and ECU for corrosion, loose pins or water intrusion. Repair connectors/wiring as needed.
Perform wiggle test on harnesses while monitoring signals to find intermittent faults.
If wiring and signals are good and actuator fails to respond correctly, replace or bench‑test the throttle body or pedal module per manufacturer procedure.
After any replacement, perform throttle adaptation/learn and clear codes. Re-test to confirm anomaly does not return.
If fault persists and all hardware checks pass, consider ECU/PCM failure or required software reflash; consult technical service information and perform software updates or ECU testing/replace as directed.

Likely causes

Degraded or inconsistent accelerator pedal sensor signal (out of tolerance or inconsistent between channels)
Throttle actuator cannot reach commanded angle due to motor fault or gear failure
High resistance or intermittent connection in harness/connectors causing incorrect signal levels
Low supply voltage or poor ground affecting actuator control
Missing throttle adaptation/learn procedure after component replacement or battery disconnect

Fault status

⚠️ Status

ECM has detected that the accelerator/throttle control system cannot achieve the requested throttle/accelerator angle; control distance signal increased beyond expected tolerance.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1–3 hours

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P1589 — accelerator unable to control desired accelerator angle of control distance signal Increase