Code
P0487
Generic
P — Powertrain
EGR Throttle Control Circuit A /Open
Views:
UK: 16
EN: 31
RU: 24
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring or connector in the EGR throttle control circuit
- Corroded or bent connector pins at the EGR throttle body or PCM
- Failed EGR throttle actuator (motor or solenoid) or internal position sensor
- Faulty PCM (less common)
- Aftermarket wiring damage, recent repairs, or water intrusion
Symptoms
- Check Engine MIL illuminated
- Reduced engine performance or 'limp' mode
- Poor idle quality or stalling
- Failed emissions test (elevated NOx/HC)
- EGR-related drivability complaints (hesitation, bucking)
What to check
- Retrieve freeze frame and live data with a scan tool; note EGR throttle position and commanded position
- Visually inspect EGR throttle body, wiring harness, and connectors for damage, corrosion, or water
- Backprobe the EGR throttle connector and measure power, ground, and signal while key ON/engine OFF
- Check connector pins for continuity to the PCM
- Perform resistance/continuity check of suspected circuit to PCM with harness disconnected
- Attempt to actuate EGR throttle with diagnostic tool; observe response and codes
Signal parameters
- Battery/power feed to throttle actuator: ~10–14 V with ignition ON (verify against vehicle manual)
- Control signal (position sensor) typically 0.5–4.5 V (varies by design) — reference service data
- Actuator coil/motor resistance often low (single‑ to low‑tens of ohms) — check spec in manual
- Control line may be PWM: duty cycle varies with commanded position; frequency commonly tens to a few hundred Hz
- Open circuit expected as infinite ohms between control pin and PCM when code set
Diagnostic algorithm
- Read and record all stored codes, freeze frame, and live PIDs. Note if code is pending or permanent.
- Visually inspect the EGR throttle body, harness routing, and connectors for physical damage, corrosion, heat or water intrusion. Repair obvious damage.
- With ignition ON (engine OFF), backprobe the EGR throttle connector: verify battery power feed, reference voltage (if present), ground continuity and signal line voltage. Compare to expected values in service data.
- Check continuity/resistance from the EGR throttle connector pins to the PCM connector pins. Repair any open or high‑resistance circuits.
- If wiring and connectors are good, command the EGR throttle from a capable scan tool. Observe commanded vs actual position and listen/observe for actuator movement. If actuator does not move but wiring is good, suspect failed actuator.
- If intermittent or connector corrosion suspected, wiggle test the harness while monitoring live data to reproduce the fault.
- If actuator resistance is out of spec or actuator fails to respond to a direct bench power test (per manufacturer procedures), replace the EGR throttle assembly.
- After repair, clear codes and perform a drive cycle or monitor live data to confirm the fault does not return.
- If wiring, connector and actuator all test good and code persists, consider PCM input/output fault and consult manufacturer resources before replacing PCM.
Likely causes
- Open or shorted control/signal wire between PCM and EGR throttle (pin A circuit)
- Detached or corroded connector at the EGR throttle body
- Failed EGR throttle motor/actuator requiring replacement
- High resistance in ground or power supply to the EGR throttle assembly
Fault status
Status
PCM detected an open/high resistance condition in EGR throttle control circuit A (EGR throttle cannot be commanded/monitored). Check wiring, connectors, and EGR throttle assembly.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0487
LAND ROVER
P — Powertrain
Circuit of the throttle position control for exhaust gas recirculation escape
Views:
UK: 5
EN: 19
RU: 10
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring or connector in the EGR throttle control circuit
- Corroded or bent connector pins at the EGR throttle body or PCM
- Failed EGR throttle actuator (motor or solenoid) or internal position sensor
- Faulty PCM (less common)
- Aftermarket wiring damage, recent repairs, or water intrusion
Symptoms
- Check Engine MIL illuminated
- Reduced engine performance or 'limp' mode
- Poor idle quality or stalling
- Failed emissions test (elevated NOx/HC)
- EGR-related drivability complaints (hesitation, bucking)
What to check
- Retrieve freeze frame and live data with a scan tool; note EGR throttle position and commanded position
- Visually inspect EGR throttle body, wiring harness, and connectors for damage, corrosion, or water
- Backprobe the EGR throttle connector and measure power, ground, and signal while key ON/engine OFF
- Check connector pins for continuity to the PCM
- Perform resistance/continuity check of suspected circuit to PCM with harness disconnected
- Attempt to actuate EGR throttle with diagnostic tool; observe response and codes
Signal parameters
- Battery/power feed to throttle actuator: ~10–14 V with ignition ON (verify against vehicle manual)
- Control signal (position sensor) typically 0.5–4.5 V (varies by design) — reference service data
- Actuator coil/motor resistance often low (single‑ to low‑tens of ohms) — check spec in manual
- Control line may be PWM: duty cycle varies with commanded position; frequency commonly tens to a few hundred Hz
- Open circuit expected as infinite ohms between control pin and PCM when code set
Diagnostic algorithm
- Read and record all stored codes, freeze frame, and live PIDs. Note if code is pending or permanent.
- Visually inspect the EGR throttle body, harness routing, and connectors for physical damage, corrosion, heat or water intrusion. Repair obvious damage.
- With ignition ON (engine OFF), backprobe the EGR throttle connector: verify battery power feed, reference voltage (if present), ground continuity and signal line voltage. Compare to expected values in service data.
- Check continuity/resistance from the EGR throttle connector pins to the PCM connector pins. Repair any open or high‑resistance circuits.
- If wiring and connectors are good, command the EGR throttle from a capable scan tool. Observe commanded vs actual position and listen/observe for actuator movement. If actuator does not move but wiring is good, suspect failed actuator.
- If intermittent or connector corrosion suspected, wiggle test the harness while monitoring live data to reproduce the fault.
- If actuator resistance is out of spec or actuator fails to respond to a direct bench power test (per manufacturer procedures), replace the EGR throttle assembly.
- After repair, clear codes and perform a drive cycle or monitor live data to confirm the fault does not return.
- If wiring, connector and actuator all test good and code persists, consider PCM input/output fault and consult manufacturer resources before replacing PCM.
Likely causes
- Open or shorted control/signal wire between PCM and EGR throttle (pin A circuit)
- Detached or corroded connector at the EGR throttle body
- Failed EGR throttle motor/actuator requiring replacement
- High resistance in ground or power supply to the EGR throttle assembly
Fault status
Status
PCM detected an open/high resistance condition in EGR throttle control circuit A (EGR throttle cannot be commanded/monitored). Check wiring, connectors, and EGR throttle assembly.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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