Code
P0112
Generic
P — Powertrain
Intake Air Temperature Sensor 1 Circuit Low Bank 1
Views:
UK: 23
EN: 39
RU: 47
AI status
Completed
Completed
100%
Causes
- IAT sensor shorted to ground
- Open or shorted wiring between IAT sensor and ECM
- Corroded, loose, or water-damaged sensor connector
- Faulty IAT sensor (thermistor out of spec)
- Faulty ECM or internal pull‑up circuit (less common)
- Incorrect sensor installed (wrong type/spec)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect intake air temperature reading on live data (very low or near 0°C regardless of ambient)
- Hard cold or hot starts, poor idle or hesitation
- Increased fuel consumption or rich/lean fuel trims
- Reduced engine performance or limp-home strategy in some vehicles
What to check
- Read freeze frame and live data (IAT reading and voltage) with scan tool
- Compare displayed IAT to known ambient temperature
- Visually inspect IAT sensor and connector for corrosion, water, oil, or damage
- Wiggle the harness while observing live IAT reading for intermittent changes
- Check for other related codes (MAF, CTS) that could point to wiring or ECM issues
Signal parameters
- Sensor type: typically NTC thermistor (resistance decreases as temperature increases)
- Typical signal: 0.1–5.0 V (varies by vehicle); mid-range ambient often ~1.0–3.0 V
- Circuit low fault threshold: voltage lower than expected (commonly
- Expected behavior: voltage increases toward reference (pull‑up) voltage as intake air gets colder, and drops as air warms
Diagnostic algorithm
- Retrieve complete codes and freeze frame data. Record ambient temp and IAT voltage/temperature at key states (cold start, running).
- With ignition ON (engine OFF), backprobe the IAT connector. Confirm reference/pull‑up voltage at sensor supply terminal (often 5V or key‑reference voltage) and signal voltage behavior. If supply missing, suspect ECM or fuse.
- Disconnect the IAT sensor and measure signal terminal voltage at the harness connector: if voltage goes to pull‑up (high) with sensor removed but was low with sensor connected, suspect sensor short/failed. If still low with sensor disconnected, suspect wiring short to ground or ECM pull‑down fault.
- Measure sensor resistance at known ambient temperature (and compare to manufacturer spec if available). If resistance is very low (near 0 Ω) or out of expected range, replace sensor.
- Check continuity from sensor harness signal wire to ECM pin and check for short to ground using a multimeter. Repair any damaged wiring or connector pins.
- If wiring and sensor test good, check ECM input using wiring diagrams; consider swapping ECM connector circuits or professional bench test if ECM suspected.
- After repair or replacement, clear codes and confirm correct live IAT readings and fuel trim behavior during test drive.
Likely causes
- Short to ground in sensor wiring (most common)
- Corroded/wet connector at sensor
- Failed/shorted IAT thermistor
- Broken wire or pinched harness near intake or airbox
Fault status
Status
PCM detected IAT sensor 1 circuit voltage below allowed threshold on Bank 1 and stored fault P0112. MIL may be active and freeze-frame/live-data recorded for diagnostic reference.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
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Workshop ManualYour experience will help others
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Code
P0112
GWM
P — Powertrain
- Inlet temperature sensor low
Views:
UK: 6
EN: 8
RU: 9
AI status
Completed
Completed
100%
Causes
- IAT sensor shorted to ground
- Open or shorted wiring between IAT sensor and ECM
- Corroded, loose, or water-damaged sensor connector
- Faulty IAT sensor (thermistor out of spec)
- Faulty ECM or internal pull‑up circuit (less common)
- Incorrect sensor installed (wrong type/spec)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect intake air temperature reading on live data (very low or near 0°C regardless of ambient)
- Hard cold or hot starts, poor idle or hesitation
- Increased fuel consumption or rich/lean fuel trims
- Reduced engine performance or limp-home strategy in some vehicles
What to check
- Read freeze frame and live data (IAT reading and voltage) with scan tool
- Compare displayed IAT to known ambient temperature
- Visually inspect IAT sensor and connector for corrosion, water, oil, or damage
- Wiggle the harness while observing live IAT reading for intermittent changes
- Check for other related codes (MAF, CTS) that could point to wiring or ECM issues
Signal parameters
- Sensor type: typically NTC thermistor (resistance decreases as temperature increases)
- Typical signal: 0.1–5.0 V (varies by vehicle); mid-range ambient often ~1.0–3.0 V
- Circuit low fault threshold: voltage lower than expected (commonly
- Expected behavior: voltage increases toward reference (pull‑up) voltage as intake air gets colder, and drops as air warms
Diagnostic algorithm
- Retrieve complete codes and freeze frame data. Record ambient temp and IAT voltage/temperature at key states (cold start, running).
- With ignition ON (engine OFF), backprobe the IAT connector. Confirm reference/pull‑up voltage at sensor supply terminal (often 5V or key‑reference voltage) and signal voltage behavior. If supply missing, suspect ECM or fuse.
- Disconnect the IAT sensor and measure signal terminal voltage at the harness connector: if voltage goes to pull‑up (high) with sensor removed but was low with sensor connected, suspect sensor short/failed. If still low with sensor disconnected, suspect wiring short to ground or ECM pull‑down fault.
- Measure sensor resistance at known ambient temperature (and compare to manufacturer spec if available). If resistance is very low (near 0 Ω) or out of expected range, replace sensor.
- Check continuity from sensor harness signal wire to ECM pin and check for short to ground using a multimeter. Repair any damaged wiring or connector pins.
- If wiring and sensor test good, check ECM input using wiring diagrams; consider swapping ECM connector circuits or professional bench test if ECM suspected.
- After repair or replacement, clear codes and confirm correct live IAT readings and fuel trim behavior during test drive.
Likely causes
- Short to ground in sensor wiring (most common)
- Corroded/wet connector at sensor
- Failed/shorted IAT thermistor
- Broken wire or pinched harness near intake or airbox
Fault status
Status
PCM detected IAT sensor 1 circuit voltage below allowed threshold on Bank 1 and stored fault P0112. MIL may be active and freeze-frame/live-data recorded for diagnostic reference.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P0112
HUMMER
P — Powertrain
Intake Air Temperature (IAT) Sensor Circuit Low Voltage
Views:
UK: 13
EN: 25
RU: 28
AI status
Completed
Completed
100%
Causes
- IAT sensor shorted to ground
- Open or shorted wiring between IAT sensor and ECM
- Corroded, loose, or water-damaged sensor connector
- Faulty IAT sensor (thermistor out of spec)
- Faulty ECM or internal pull‑up circuit (less common)
- Incorrect sensor installed (wrong type/spec)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect intake air temperature reading on live data (very low or near 0°C regardless of ambient)
- Hard cold or hot starts, poor idle or hesitation
- Increased fuel consumption or rich/lean fuel trims
- Reduced engine performance or limp-home strategy in some vehicles
What to check
- Read freeze frame and live data (IAT reading and voltage) with scan tool
- Compare displayed IAT to known ambient temperature
- Visually inspect IAT sensor and connector for corrosion, water, oil, or damage
- Wiggle the harness while observing live IAT reading for intermittent changes
- Check for other related codes (MAF, CTS) that could point to wiring or ECM issues
Signal parameters
- Sensor type: typically NTC thermistor (resistance decreases as temperature increases)
- Typical signal: 0.1–5.0 V (varies by vehicle); mid-range ambient often ~1.0–3.0 V
- Circuit low fault threshold: voltage lower than expected (commonly
- Expected behavior: voltage increases toward reference (pull‑up) voltage as intake air gets colder, and drops as air warms
Diagnostic algorithm
- Retrieve complete codes and freeze frame data. Record ambient temp and IAT voltage/temperature at key states (cold start, running).
- With ignition ON (engine OFF), backprobe the IAT connector. Confirm reference/pull‑up voltage at sensor supply terminal (often 5V or key‑reference voltage) and signal voltage behavior. If supply missing, suspect ECM or fuse.
- Disconnect the IAT sensor and measure signal terminal voltage at the harness connector: if voltage goes to pull‑up (high) with sensor removed but was low with sensor connected, suspect sensor short/failed. If still low with sensor disconnected, suspect wiring short to ground or ECM pull‑down fault.
- Measure sensor resistance at known ambient temperature (and compare to manufacturer spec if available). If resistance is very low (near 0 Ω) or out of expected range, replace sensor.
- Check continuity from sensor harness signal wire to ECM pin and check for short to ground using a multimeter. Repair any damaged wiring or connector pins.
- If wiring and sensor test good, check ECM input using wiring diagrams; consider swapping ECM connector circuits or professional bench test if ECM suspected.
- After repair or replacement, clear codes and confirm correct live IAT readings and fuel trim behavior during test drive.
Likely causes
- Short to ground in sensor wiring (most common)
- Corroded/wet connector at sensor
- Failed/shorted IAT thermistor
- Broken wire or pinched harness near intake or airbox
Fault status
Status
PCM detected IAT sensor 1 circuit voltage below allowed threshold on Bank 1 and stored fault P0112. MIL may be active and freeze-frame/live-data recorded for diagnostic reference.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P0112
ISUZU
P — Powertrain
Intake Air Temperature Sensor Circuit Low
Views:
UK: 14
EN: 42
RU: 52
AI status
Completed
Completed
100%
Causes
- IAT sensor shorted to ground
- Open or shorted wiring between IAT sensor and ECM
- Corroded, loose, or water-damaged sensor connector
- Faulty IAT sensor (thermistor out of spec)
- Faulty ECM or internal pull‑up circuit (less common)
- Incorrect sensor installed (wrong type/spec)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect intake air temperature reading on live data (very low or near 0°C regardless of ambient)
- Hard cold or hot starts, poor idle or hesitation
- Increased fuel consumption or rich/lean fuel trims
- Reduced engine performance or limp-home strategy in some vehicles
What to check
- Read freeze frame and live data (IAT reading and voltage) with scan tool
- Compare displayed IAT to known ambient temperature
- Visually inspect IAT sensor and connector for corrosion, water, oil, or damage
- Wiggle the harness while observing live IAT reading for intermittent changes
- Check for other related codes (MAF, CTS) that could point to wiring or ECM issues
Signal parameters
- Sensor type: typically NTC thermistor (resistance decreases as temperature increases)
- Typical signal: 0.1–5.0 V (varies by vehicle); mid-range ambient often ~1.0–3.0 V
- Circuit low fault threshold: voltage lower than expected (commonly
- Expected behavior: voltage increases toward reference (pull‑up) voltage as intake air gets colder, and drops as air warms
Diagnostic algorithm
- Retrieve complete codes and freeze frame data. Record ambient temp and IAT voltage/temperature at key states (cold start, running).
- With ignition ON (engine OFF), backprobe the IAT connector. Confirm reference/pull‑up voltage at sensor supply terminal (often 5V or key‑reference voltage) and signal voltage behavior. If supply missing, suspect ECM or fuse.
- Disconnect the IAT sensor and measure signal terminal voltage at the harness connector: if voltage goes to pull‑up (high) with sensor removed but was low with sensor connected, suspect sensor short/failed. If still low with sensor disconnected, suspect wiring short to ground or ECM pull‑down fault.
- Measure sensor resistance at known ambient temperature (and compare to manufacturer spec if available). If resistance is very low (near 0 Ω) or out of expected range, replace sensor.
- Check continuity from sensor harness signal wire to ECM pin and check for short to ground using a multimeter. Repair any damaged wiring or connector pins.
- If wiring and sensor test good, check ECM input using wiring diagrams; consider swapping ECM connector circuits or professional bench test if ECM suspected.
- After repair or replacement, clear codes and confirm correct live IAT readings and fuel trim behavior during test drive.
Likely causes
- Short to ground in sensor wiring (most common)
- Corroded/wet connector at sensor
- Failed/shorted IAT thermistor
- Broken wire or pinched harness near intake or airbox
Fault status
Status
PCM detected IAT sensor 1 circuit voltage below allowed threshold on Bank 1 and stored fault P0112. MIL may be active and freeze-frame/live-data recorded for diagnostic reference.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Was this AI description helpful?
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Code
P0112
LAND ROVER
P — Powertrain
Intake Air Temperature Circuit Low Input
Views:
UK: 4
EN: 13
RU: 21
AI status
Completed
Completed
100%
Causes
- IAT sensor shorted to ground
- Open or shorted wiring between IAT sensor and ECM
- Corroded, loose, or water-damaged sensor connector
- Faulty IAT sensor (thermistor out of spec)
- Faulty ECM or internal pull‑up circuit (less common)
- Incorrect sensor installed (wrong type/spec)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect intake air temperature reading on live data (very low or near 0°C regardless of ambient)
- Hard cold or hot starts, poor idle or hesitation
- Increased fuel consumption or rich/lean fuel trims
- Reduced engine performance or limp-home strategy in some vehicles
What to check
- Read freeze frame and live data (IAT reading and voltage) with scan tool
- Compare displayed IAT to known ambient temperature
- Visually inspect IAT sensor and connector for corrosion, water, oil, or damage
- Wiggle the harness while observing live IAT reading for intermittent changes
- Check for other related codes (MAF, CTS) that could point to wiring or ECM issues
Signal parameters
- Sensor type: typically NTC thermistor (resistance decreases as temperature increases)
- Typical signal: 0.1–5.0 V (varies by vehicle); mid-range ambient often ~1.0–3.0 V
- Circuit low fault threshold: voltage lower than expected (commonly
- Expected behavior: voltage increases toward reference (pull‑up) voltage as intake air gets colder, and drops as air warms
Diagnostic algorithm
- Retrieve complete codes and freeze frame data. Record ambient temp and IAT voltage/temperature at key states (cold start, running).
- With ignition ON (engine OFF), backprobe the IAT connector. Confirm reference/pull‑up voltage at sensor supply terminal (often 5V or key‑reference voltage) and signal voltage behavior. If supply missing, suspect ECM or fuse.
- Disconnect the IAT sensor and measure signal terminal voltage at the harness connector: if voltage goes to pull‑up (high) with sensor removed but was low with sensor connected, suspect sensor short/failed. If still low with sensor disconnected, suspect wiring short to ground or ECM pull‑down fault.
- Measure sensor resistance at known ambient temperature (and compare to manufacturer spec if available). If resistance is very low (near 0 Ω) or out of expected range, replace sensor.
- Check continuity from sensor harness signal wire to ECM pin and check for short to ground using a multimeter. Repair any damaged wiring or connector pins.
- If wiring and sensor test good, check ECM input using wiring diagrams; consider swapping ECM connector circuits or professional bench test if ECM suspected.
- After repair or replacement, clear codes and confirm correct live IAT readings and fuel trim behavior during test drive.
Likely causes
- Short to ground in sensor wiring (most common)
- Corroded/wet connector at sensor
- Failed/shorted IAT thermistor
- Broken wire or pinched harness near intake or airbox
Fault status
Status
PCM detected IAT sensor 1 circuit voltage below allowed threshold on Bank 1 and stored fault P0112. MIL may be active and freeze-frame/live-data recorded for diagnostic reference.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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Code
P0112
MITSUBISHI
P — Powertrain
Intake air temperature SNS.low
Views:
UK: 7
EN: 20
RU: 26
AI status
Completed
Completed
100%
Causes
- IAT sensor shorted to ground
- Open or shorted wiring between IAT sensor and ECM
- Corroded, loose, or water-damaged sensor connector
- Faulty IAT sensor (thermistor out of spec)
- Faulty ECM or internal pull‑up circuit (less common)
- Incorrect sensor installed (wrong type/spec)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Incorrect intake air temperature reading on live data (very low or near 0°C regardless of ambient)
- Hard cold or hot starts, poor idle or hesitation
- Increased fuel consumption or rich/lean fuel trims
- Reduced engine performance or limp-home strategy in some vehicles
What to check
- Read freeze frame and live data (IAT reading and voltage) with scan tool
- Compare displayed IAT to known ambient temperature
- Visually inspect IAT sensor and connector for corrosion, water, oil, or damage
- Wiggle the harness while observing live IAT reading for intermittent changes
- Check for other related codes (MAF, CTS) that could point to wiring or ECM issues
Signal parameters
- Sensor type: typically NTC thermistor (resistance decreases as temperature increases)
- Typical signal: 0.1–5.0 V (varies by vehicle); mid-range ambient often ~1.0–3.0 V
- Circuit low fault threshold: voltage lower than expected (commonly
- Expected behavior: voltage increases toward reference (pull‑up) voltage as intake air gets colder, and drops as air warms
Diagnostic algorithm
- Retrieve complete codes and freeze frame data. Record ambient temp and IAT voltage/temperature at key states (cold start, running).
- With ignition ON (engine OFF), backprobe the IAT connector. Confirm reference/pull‑up voltage at sensor supply terminal (often 5V or key‑reference voltage) and signal voltage behavior. If supply missing, suspect ECM or fuse.
- Disconnect the IAT sensor and measure signal terminal voltage at the harness connector: if voltage goes to pull‑up (high) with sensor removed but was low with sensor connected, suspect sensor short/failed. If still low with sensor disconnected, suspect wiring short to ground or ECM pull‑down fault.
- Measure sensor resistance at known ambient temperature (and compare to manufacturer spec if available). If resistance is very low (near 0 Ω) or out of expected range, replace sensor.
- Check continuity from sensor harness signal wire to ECM pin and check for short to ground using a multimeter. Repair any damaged wiring or connector pins.
- If wiring and sensor test good, check ECM input using wiring diagrams; consider swapping ECM connector circuits or professional bench test if ECM suspected.
- After repair or replacement, clear codes and confirm correct live IAT readings and fuel trim behavior during test drive.
Likely causes
- Short to ground in sensor wiring (most common)
- Corroded/wet connector at sensor
- Failed/shorted IAT thermistor
- Broken wire or pinched harness near intake or airbox
Fault status
Status
PCM detected IAT sensor 1 circuit voltage below allowed threshold on Bank 1 and stored fault P0112. MIL may be active and freeze-frame/live-data recorded for diagnostic reference.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
Send to email