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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1386 (Engine Control System Diagnosis (DTC P0010 To DTC P0128) -- 1.8L (LV6)) >> Diagnosis >> DTC P0122 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Vibe. 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. 1:  The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
  2. 2:  This step determines if DTC P0122 is the result of a hard failure or an intermittent condition.
  3. 6:  When the 5-volt reference is jumpered to the TP sensor 1 input circuit, the scan tool parameter should read 99 percent.
DTC P0122

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Powertrain Control Module (PCM) Connector End Views  or  Engine Controls Connector End Views 
1  Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2  With the throttle closed, select the TP sensor parameter on the scan tool.
Is the TP sensor percentage within the specified value?		 7-16% Go to Step 3  Go to Step 4 
3
  1. Perform the scan tool Clear DTC Information function.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Freeze Frame conditions as specified.
Does DTC P0122 set?		 - Go to Step 4  Go to Diagnostic Aids
4 Is a DTC P0452 also set? - Go to Step 8  Go to Step 5 
5
  1. Disconnect the TP sensor electrical connector.
  2. Measure the voltage of the 5-volt reference circuit of the TP sensor at the harness connector with a DMM.
Is the reference circuit voltage within the specified value?		 4.9-5.1 V Go to Step 6  Go to Step 7 
6 
  1. Jump the 5-volt reference circuit and the TP sensor input circuit together at the harness connector.
  2. Observe the TP sensor on the scan tool.
Is the TP sensor percentage more than the specified value?		 90% Go to Step 10  Go to Step 9 
7 Repair the open in the 5-volt reference circuit between SP108 and the TP sensor. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct a condition?		 - Go to Step 14  -
8
  1. Test for an open in the 5 volt reference circuit between SP108 and the PCM.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct a condition?		 - Go to Step 14  Go to Step 12 
9
  1. Test the TP sensor input circuit for an open or a short to ground.
  2. Repair the circuit as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct a condition?		 - Go to Step 14  Go to Step 12 
10
  1. Test for an intermittent or a poor electrical connection at the TP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
  2. Repair as necessary.
Did you find and correct a condition?		 - Go to Step 14  Go to Step 11 
11 Replace the TP sensor. Refer to Throttle Position (TP) Sensor Replacement (AWD) .
Did you complete the replacement?		 - Go to Step 14  -
12
  1. Test for an intermittent or a poor electrical connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
  2. Repair as necessary.
Did you find and correct a condition?		 - Go to Step 14  Go to Step 13 
13 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 - Go to Step 14  -
14
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC run and pass?		 - Go to Step 15  Go to Step 2 
15 With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
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