C1094

Code

ALFA ROMEO C — Chassis

Right rear discharge valve

Brand: ALFA ROMEO

Type: C — Chassis

Views: UK: 24 EN: 44 RU: 26

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted wiring to right‑rear discharge valve
Poor connector contact or corrosion at valve or ABS module connector
Faulty right‑rear discharge (solenoid) valve
Faulty ABS/ESC control module or internal driver circuit
Related fuse, relay or power supply fault
Mechanical seizure or hydraulic blockage in valve body

Symptoms

ABS/ESC warning lamp illuminated on dash
Reduced ABS/traction control function; possible ABS active not available
Abnormal brake feel during ABS operation or pulsation
Brake stability/traction control interventions may be incorrect or absent
Diagnostic trouble code(s) stored; related ABS faults may also be present

What to check

Retrieve full ABS fault list and freeze frame with a factory‑level scan tool
Visually inspect wiring and connector at right‑rear valve and ABS hydraulic unit for damage, corrosion, or loose pins
Check battery voltage and ground connections before testing (stable >12V)
Check relevant fuses and relays powering ABS hydraulic unit
Measure coil resistance of the right‑rear discharge valve at the valve connector (compare to spec)
Backprobe valve control circuit at the ABS module while operating ABS tests with scan tool; check for control pulses and proper supply voltage

Signal parameters

Typical valve coil resistance: commonly in the low ohms to tens of ohms range (e.g., ~5–30 Ω) — consult vehicle‑specific spec
Control signal: PWM switching from the ABS module; amplitude usually 0–12 V (battery referenced) with variable duty cycle during modulation
Idle/standby: valve circuit may be held to supply or ground depending on system design; monitor for steady voltage or pulsed waveform while commanding valve
Expected actuator current: pulses up to ~1–3 A depending on design — use clamp meter/oscilloscope when checking

Diagnostic algorithm

Connect a capable ABS scan tool, read and record all ABS/ESC codes and freeze frame data; clear codes and attempt re‑creation.
Visually inspect valve harness and connectors (right‑rear). Repair any obvious damage before further testing.
Confirm battery voltage and good chassis/engine ground. Low voltage can cause spurious faults.
With ignition on, measure supply voltage at the valve connector; verify reference power and ground presence per wiring diagram.
Measure coil resistance at the valve connector (apply manufacturer spec). An open or shorted coil indicates valve replacement.
Command the right‑rear discharge valve using an active test from the scan tool while backprobing the control line at the ABS module and at the valve; observe voltage waveform and current draw with oscilloscope/ammeter.
If electrical control is present at the module but not at the valve, inspect wiring between module and valve (repair open/short). If control is absent at the module, suspect ABS module driver fault and continue module diagnosis per factory procedure.
If valve is electrically good but hydraulic operation is suspect, replace or rebuild ABS hydraulic unit/valve block and bleed system per service manual. After repairs, clear codes and perform road test and ABS functional test.
If module replacement is required, follow manufacturer programming/relearn/adaptation procedures as specified.

Likely causes

Damaged wiring harness or chafed insulation to right‑rear valve
Corroded/loose connector at the valve or ABS module
Failed discharge solenoid (valve coil short/open)
Faulty hydraulic control unit (ABS pump/valve assembly)

Fault status

⚠️ Status

Fault detected in right‑rear discharge valve circuit — ABS/ESC control limited until repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

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Code

C1094

FIAT C — Chassis

Right rear discharge valve

Brand: FIAT

Type: C — Chassis

Views: UK: 27 EN: 47 RU: 27

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted wiring to right‑rear discharge valve
Poor connector contact or corrosion at valve or ABS module connector
Faulty right‑rear discharge (solenoid) valve
Faulty ABS/ESC control module or internal driver circuit
Related fuse, relay or power supply fault
Mechanical seizure or hydraulic blockage in valve body

Symptoms

ABS/ESC warning lamp illuminated on dash
Reduced ABS/traction control function; possible ABS active not available
Abnormal brake feel during ABS operation or pulsation
Brake stability/traction control interventions may be incorrect or absent
Diagnostic trouble code(s) stored; related ABS faults may also be present

What to check

Retrieve full ABS fault list and freeze frame with a factory‑level scan tool
Visually inspect wiring and connector at right‑rear valve and ABS hydraulic unit for damage, corrosion, or loose pins
Check battery voltage and ground connections before testing (stable >12V)
Check relevant fuses and relays powering ABS hydraulic unit
Measure coil resistance of the right‑rear discharge valve at the valve connector (compare to spec)
Backprobe valve control circuit at the ABS module while operating ABS tests with scan tool; check for control pulses and proper supply voltage

Signal parameters

Typical valve coil resistance: commonly in the low ohms to tens of ohms range (e.g., ~5–30 Ω) — consult vehicle‑specific spec
Control signal: PWM switching from the ABS module; amplitude usually 0–12 V (battery referenced) with variable duty cycle during modulation
Idle/standby: valve circuit may be held to supply or ground depending on system design; monitor for steady voltage or pulsed waveform while commanding valve
Expected actuator current: pulses up to ~1–3 A depending on design — use clamp meter/oscilloscope when checking

Diagnostic algorithm

Connect a capable ABS scan tool, read and record all ABS/ESC codes and freeze frame data; clear codes and attempt re‑creation.
Visually inspect valve harness and connectors (right‑rear). Repair any obvious damage before further testing.
Confirm battery voltage and good chassis/engine ground. Low voltage can cause spurious faults.
With ignition on, measure supply voltage at the valve connector; verify reference power and ground presence per wiring diagram.
Measure coil resistance at the valve connector (apply manufacturer spec). An open or shorted coil indicates valve replacement.
Command the right‑rear discharge valve using an active test from the scan tool while backprobing the control line at the ABS module and at the valve; observe voltage waveform and current draw with oscilloscope/ammeter.
If electrical control is present at the module but not at the valve, inspect wiring between module and valve (repair open/short). If control is absent at the module, suspect ABS module driver fault and continue module diagnosis per factory procedure.
If valve is electrically good but hydraulic operation is suspect, replace or rebuild ABS hydraulic unit/valve block and bleed system per service manual. After repairs, clear codes and perform road test and ABS functional test.
If module replacement is required, follow manufacturer programming/relearn/adaptation procedures as specified.

Likely causes

Damaged wiring harness or chafed insulation to right‑rear valve
Corroded/loose connector at the valve or ABS module
Failed discharge solenoid (valve coil short/open)
Faulty hydraulic control unit (ABS pump/valve assembly)

Fault status

⚠️ Status

Fault detected in right‑rear discharge valve circuit — ABS/ESC control limited until repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

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Code

C1094

LAND ROVER C — Chassis

Parking brake apply switch - circuit failure

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 23 EN: 39 RU: 27

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted wiring to right‑rear discharge valve
Poor connector contact or corrosion at valve or ABS module connector
Faulty right‑rear discharge (solenoid) valve
Faulty ABS/ESC control module or internal driver circuit
Related fuse, relay or power supply fault
Mechanical seizure or hydraulic blockage in valve body

Symptoms

ABS/ESC warning lamp illuminated on dash
Reduced ABS/traction control function; possible ABS active not available
Abnormal brake feel during ABS operation or pulsation
Brake stability/traction control interventions may be incorrect or absent
Diagnostic trouble code(s) stored; related ABS faults may also be present

What to check

Retrieve full ABS fault list and freeze frame with a factory‑level scan tool
Visually inspect wiring and connector at right‑rear valve and ABS hydraulic unit for damage, corrosion, or loose pins
Check battery voltage and ground connections before testing (stable >12V)
Check relevant fuses and relays powering ABS hydraulic unit
Measure coil resistance of the right‑rear discharge valve at the valve connector (compare to spec)
Backprobe valve control circuit at the ABS module while operating ABS tests with scan tool; check for control pulses and proper supply voltage

Signal parameters

Typical valve coil resistance: commonly in the low ohms to tens of ohms range (e.g., ~5–30 Ω) — consult vehicle‑specific spec
Control signal: PWM switching from the ABS module; amplitude usually 0–12 V (battery referenced) with variable duty cycle during modulation
Idle/standby: valve circuit may be held to supply or ground depending on system design; monitor for steady voltage or pulsed waveform while commanding valve
Expected actuator current: pulses up to ~1–3 A depending on design — use clamp meter/oscilloscope when checking

Diagnostic algorithm

Connect a capable ABS scan tool, read and record all ABS/ESC codes and freeze frame data; clear codes and attempt re‑creation.
Visually inspect valve harness and connectors (right‑rear). Repair any obvious damage before further testing.
Confirm battery voltage and good chassis/engine ground. Low voltage can cause spurious faults.
With ignition on, measure supply voltage at the valve connector; verify reference power and ground presence per wiring diagram.
Measure coil resistance at the valve connector (apply manufacturer spec). An open or shorted coil indicates valve replacement.
Command the right‑rear discharge valve using an active test from the scan tool while backprobing the control line at the ABS module and at the valve; observe voltage waveform and current draw with oscilloscope/ammeter.
If electrical control is present at the module but not at the valve, inspect wiring between module and valve (repair open/short). If control is absent at the module, suspect ABS module driver fault and continue module diagnosis per factory procedure.
If valve is electrically good but hydraulic operation is suspect, replace or rebuild ABS hydraulic unit/valve block and bleed system per service manual. After repairs, clear codes and perform road test and ABS functional test.
If module replacement is required, follow manufacturer programming/relearn/adaptation procedures as specified.

Likely causes

Damaged wiring harness or chafed insulation to right‑rear valve
Corroded/loose connector at the valve or ABS module
Failed discharge solenoid (valve coil short/open)
Faulty hydraulic control unit (ABS pump/valve assembly)

Fault status

⚠️ Status

Fault detected in right‑rear discharge valve circuit — ABS/ESC control limited until repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

Repair manuals

Manual library for LAND ROVER

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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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