P0070

Code

LAND ROVER P — Powertrain

Ambient Air Temperature Sensor Circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 8 EN: 20 RU: 15

AI status

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Page language: EN

Causes

Open or short in ambient air temperature sensor wiring
Corroded, damaged or water‑ingress connector at the sensor
Failed ambient air temperature sensor (thermistor)
Poor ground or reference voltage to the sensor
Intermittent connection (broken wire, loose terminal)
ECM/PCM internal fault (rare)

Symptoms

Ambient temperature reading on dash/climate control incorrect or stuck
Automatic climate control may operate improperly (incorrect blower/AC cycling)
Remote start/automatic HVAC logic may behave incorrectly
Possible MIL illumination or stored freeze-frame data
Usually no direct change in engine drivability, but may affect idle/engine temp strategies in some models

What to check

Retrieve freeze frame and code details with a scan tool; note whether code is active or intermittent
Visual inspection of sensor location (usually front bumper/grille area) for damage, debris, insect/water ingress
Check connector for corrosion, bent pins, water traps or broken clips
Backprobe sensor connector with key ON (engine OFF) to verify reference voltage and signal voltage
Measure sensor resistance with sensor disconnected and compare to OEM spec
Wiggle/press harness while monitoring signal for intermittent faults

Signal parameters

Reference voltage: typically ~5.0 V (verify against OEM spec)
Signal voltage range (typical): approximately 0.1 V to 4.9 V depending on temperature and circuit design
Typical thermistor resistance (approximate): ~10 kΩ at 25 °C (many Land Rover sensors are 10 kΩ NTC; confirm OEM spec)
Open circuit: infinite resistance or signal voltage out-of-range (often >4.9 V or floating)
Short to ground: signal ~0 V
Short to battery: signal near battery voltage (may register as circuit high)

Diagnostic algorithm

Verify code: connect scan tool, confirm P0070 and note whether code is active, pending, or intermittent; record freeze frame data.
Visual inspection: examine sensor mounting area (front bumper/grille), connector, and harness for water, corrosion, damage or debris. Repair obvious physical issues.
Check connector power/ground: backprobe connector with key ON (engine OFF). Verify sensor reference voltage (≈5 V) and good ground. If reference missing, trace back to ECM/fuse.
Measure sensor voltage: with connector plugged in, observe signal voltage while ambient temperature is stable. Compare to expected voltage for current ambient temperature (or to previous known-good values).
Measure sensor resistance: disconnect sensor and measure resistance across sensor terminals at ambient temperature. Compare to OEM resistance vs temperature chart. Replace if out of spec.
Wiggle test: with harness backprobed or meter connected, move wiring and connector to reproduce intermittent faults; inspect for wiring breaks.
Check for shorts: if voltage too high or low, isolate and test wiring for short to battery or ground using an ohmmeter (engine off, battery disconnected when performing continuity tests that require it).
Repair or replace: repair wiring/connector or replace sensor if faults confirmed. Use OEM replacement part where possible.
Clear DTC: after repair clear codes and perform vehicle readiness/test drive; verify code does not return and ambient temperature reading behaves normally.
If problem persists: consider ECM/PCM fault only after wiring and sensor verified good; consult manufacturer procedures for ECM testing or module reprogramming.

Likely causes

Cracked/broken sensor housing or water-damaged sensor (common on front-mounted sensors)
Connector pins corroded or pushed out (front grill area exposure)
Wire chafing shorted to chassis or power, or pinched at harness grommet
Sensor removed/installed incorrectly or replaced with wrong part
Aftermarket accessories or repairs disturbed the harness

Fault status

⚠️ Status

Ambient Air Temperature Sensor Circuit fault stored (P0070). Fault may be active or intermittent. Symptoms include incorrect ambient temp reading and climate control issues. Inspect sensor, connector, wiring, and verify reference/signal voltages before replacing components. MIL may be illuminated and freeze frame data stored.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5–1.5 hours

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