WagonRFix

P0112 on Suzuki Wagon R: Intake Air Temperature Sensor 1 Circuit Low Input

Short answer: P0112 means “Intake Air Temperature Sensor 1 Circuit Low Input”. The car’s computer has found a fault in the Engine system and turns on the Check engine light (MIL). First check: read the code and freeze-frame data with an OBD-II scanner.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code
P0112
System
Engine
Dashboard light
Check engine light (MIL)
Also sold as
Maruti Suzuki Wagon R, Suzuki Karimun Wagon R (Indonesia)
Applies to
Generic OBD-II meaning. Not every code is used by this car.
Confidence
medium (generic OBD-II definition, not checked against the factory manual for this car)
Source
obd-codes.com

Symptoms and when it is set

  1. Check engine light on
  2. There may be no noticeable symptoms of a
  3. P0112
  4. Indicator Lamp). However, a emissions test may reveal higher Nox readings depending
  5. On the type of IAT failure. Or the engine may ping under load, depending on the
  6. Type of IAT failure

Likely causes

  1. Usually the P0112 is caused by a bad IAT (internally shorted or open or otherwise damaged)
  2. But it could also be
  3. No reference voltage to the IAT sensor due to an open wire
  4. Excessively high intake air temperatures
  5. Short to ground on signal circuit
  6. Damaged IAT connector
  7. Bad PCM

What to check, in order

  1. Read the code and freeze-frame data with an OBD-II scanner
  2. Check the connector and wiring of the part named in the code
  3. Test the part with scanner live data or a multimeter, using the values in the repair manual
  4. Fix the cause, clear the code and test-drive

Related on this car

Same code on other cars

← P0110 P0113 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.