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Home / DTC / B1073 — main arc piston sensor

B1073 — main arc piston sensor

Detailed page for trouble code B1073.

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22,461specific
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Code

B1073

LAND ROVER B — Body

main arc piston sensor

Brand: LAND ROVER
Type: B — Body
Views: UK: 24 EN: 34 RU: 23
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in sensor wiring (including chafing or broken conductor)
  • Poor or corroded connector connection at sensor or control module
  • Faulty main arc piston position sensor (internal failure)
  • Mechanical binding, seized or mis-aligned piston/actuator preventing expected sensor movement
  • Ground or reference voltage fault from control module
  • Faulty body/control module or software anomaly

Symptoms

  • Related system (roof, tailgate, door, suspension arc) may not operate or operates intermittently
  • Warning message or lamp for affected body system on dash
  • Unusual/limited travel or abnormal movement of the mechanism
  • Diagnostics show out-of-range or noisy sensor values in live data

What to check

  • Read and record freeze frame and full DTC list with a capable diagnostic tool
  • Inspect wiring and connector at the main arc piston sensor for damage, corrosion and secure fit
  • Backprobe the sensor connector and check for reference voltage (typically ~5V), ground and signal while cycling the mechanism
  • Check live data for sensor position values while operating the mechanism — look for jumps, noise or no change
  • Perform wiggle test on harness while watching live data or DTCs to find intermittent faults
  • Inspect the actuator/piston for mechanical binding, wear or foreign objects restricting movement

Signal parameters

  • Reference supply: typically 5 V (verify exact spec in vehicle service literature)
  • Signal output: position sensor usually varies between ~0.5 V and ~4.5 V as piston moves (Hall or potentiometer-type)
  • Ground continuity: near 0 ohms to chassis ground
  • Typical sensor resistance (potentiometer types): manufacturer-specific — often in the kiloohm range (check service manual)

Diagnostic algorithm

  1. Retrieve all DTCs and freeze frame data. Note if B1073 is current or historic and any related body/control module codes.
  2. Visually inspect sensor, connector and harness routing, especially across hinge/motion points. Repair obvious damage.
  3. With connector connected, backprobe reference, signal and ground. Verify correct reference voltage and stable ground.
  4. Operate the mechanism slowly while monitoring the sensor signal on a multimeter or scan tool live data. Confirm smooth, proportional change.
  5. If signal is absent or out of range, disconnect sensor and measure resistance (if applicable) or check sensor output with known good reference. Compare to specs.
  6. Perform wiggle test on wiring with mechanism cycling to reproduce the fault. Repair/replace wiring or connector as found.
  7. If wiring and connector are good but sensor output is incorrect, replace the main arc piston sensor and retest.
  8. If fault persists after sensor replacement, check the controlling module's supply/ground pins and consider module-level diagnostics or software updates per dealer procedures.
  9. Clear codes and perform full function test to confirm repair. Re-scan after test cycles.

Likely causes

  • Damaged or rubbed-through wiring harness at moving joint
  • Water ingress/corrosion at sensor connector
  • Failed potentiometer/Hall-effect element inside the piston sensor
  • Actuator stuck or mechanically obstructed causing no/erratic sensor movement
  • Intermittent ground or 5V reference due to connector fault

Fault status

⚠️ Status
Main arc piston sensor signal fault — position sensor reading out of range or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B1070 B1071 B1072 B1074 B1075 B1080
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

B1073

MITSUBISHI B — Body

R.air outlet DMPR.potentio.open

Brand: MITSUBISHI
Type: B — Body
Views: UK: 23 EN: 35 RU: 27
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in sensor wiring (including chafing or broken conductor)
  • Poor or corroded connector connection at sensor or control module
  • Faulty main arc piston position sensor (internal failure)
  • Mechanical binding, seized or mis-aligned piston/actuator preventing expected sensor movement
  • Ground or reference voltage fault from control module
  • Faulty body/control module or software anomaly

Symptoms

  • Related system (roof, tailgate, door, suspension arc) may not operate or operates intermittently
  • Warning message or lamp for affected body system on dash
  • Unusual/limited travel or abnormal movement of the mechanism
  • Diagnostics show out-of-range or noisy sensor values in live data

What to check

  • Read and record freeze frame and full DTC list with a capable diagnostic tool
  • Inspect wiring and connector at the main arc piston sensor for damage, corrosion and secure fit
  • Backprobe the sensor connector and check for reference voltage (typically ~5V), ground and signal while cycling the mechanism
  • Check live data for sensor position values while operating the mechanism — look for jumps, noise or no change
  • Perform wiggle test on harness while watching live data or DTCs to find intermittent faults
  • Inspect the actuator/piston for mechanical binding, wear or foreign objects restricting movement

Signal parameters

  • Reference supply: typically 5 V (verify exact spec in vehicle service literature)
  • Signal output: position sensor usually varies between ~0.5 V and ~4.5 V as piston moves (Hall or potentiometer-type)
  • Ground continuity: near 0 ohms to chassis ground
  • Typical sensor resistance (potentiometer types): manufacturer-specific — often in the kiloohm range (check service manual)

Diagnostic algorithm

  1. Retrieve all DTCs and freeze frame data. Note if B1073 is current or historic and any related body/control module codes.
  2. Visually inspect sensor, connector and harness routing, especially across hinge/motion points. Repair obvious damage.
  3. With connector connected, backprobe reference, signal and ground. Verify correct reference voltage and stable ground.
  4. Operate the mechanism slowly while monitoring the sensor signal on a multimeter or scan tool live data. Confirm smooth, proportional change.
  5. If signal is absent or out of range, disconnect sensor and measure resistance (if applicable) or check sensor output with known good reference. Compare to specs.
  6. Perform wiggle test on wiring with mechanism cycling to reproduce the fault. Repair/replace wiring or connector as found.
  7. If wiring and connector are good but sensor output is incorrect, replace the main arc piston sensor and retest.
  8. If fault persists after sensor replacement, check the controlling module's supply/ground pins and consider module-level diagnostics or software updates per dealer procedures.
  9. Clear codes and perform full function test to confirm repair. Re-scan after test cycles.

Likely causes

  • Damaged or rubbed-through wiring harness at moving joint
  • Water ingress/corrosion at sensor connector
  • Failed potentiometer/Hall-effect element inside the piston sensor
  • Actuator stuck or mechanically obstructed causing no/erratic sensor movement
  • Intermittent ground or 5V reference due to connector fault

Fault status

⚠️ Status
Main arc piston sensor signal fault — position sensor reading out of range or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B1070 B1071 B1072 B1074 B1075 B1080
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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