LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1857 (Engine Controls And Fuel - 3.5L (L66) - DTC P0030 To DTC P0222) >> DTC P0112 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step determines if a condition is present.
  2. 4:  An intake air temperature below -30°C (-22°F) indicates the PCM and the IAT wiring are OK.
  3. 5:  Disconnecting the PCM allows using the DMM in order to check continuity of the circuits. This aids in locating an open or a shorted circuit.
  4. 7:  After replacing the PCM a new minimum throttle position and idle speed must also be established.
DTC P0112

Step Action Values Yes No
Connector End View Reference:  Powertrain Control Module Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the IAT sensor parameter with a scan tool.
Does the scan tool indicate that the IAT sensor is more than specified value?		 168°C (334°F) Go to Step 4  Go to Step 3 
3
  1. Observe the Freeze Frame and/or the Failure records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame and/or the Failure Records data.
Does the DTC fail this ignition cycle?		 - Go to Step 4  Go to Diagnostic Aids In This Test
4 
  1. Turn OFF the ignition.
  2. Disconnect the electrical connector of the IAT sensor. Refer to Intake Air Temperature Sensor 1 Replacement .
  3. Turn ON the ignition, with the engine OFF.
Does the scan tool indicate that the IAT sensor is at the specified value?		 -40°C (-40°F) Go to Step 6  Go to Step 5 
5 
  1. Turn OFF the ignition.
  2. Disconnect the PCM. Refer to Powertrain Control Module Replacement .
  3. Test the IAT signal circuit for a short to a ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 8  Go to Step 7 
6 Replace the IAT sensor. Refer to Intake Air Temperature Sensor 1 Replacement
Did you complete the replacement?		 - Go to Step 8  -
7 
  1. Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
  2. Perform the idle learn procedure. Refer to Idle Learn .
Did you complete the replacement?		 - Go to Step 8  -
8
  1. Use the scan tool in order to clear the DTCs.
  2. Turn the ignition OFF for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC run and pass?		 - Go to Step 9  Go to Step 2 
9 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
scientia non olet · About LEMON Manuals