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Home >> Buick >> 2004 >> Century Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (DTC P0506 To P1640) >> Engine Controls Diagnosis >> DTC P1122 >> Test Description
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Test Description

The number below refers to the step number on the diagnostic table.

  1. 6:  This test will determine an intermittent faulty TP sensor utilizing the DMMs MIN MAX, 100 millisecond capture mode.
DTC P1122

Step Action Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Controls Connector End Views  or  Powertrain Control Module (PCM) 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
  1. Turn OFF the ignition.
  2. Disconnect the throttle position (TP) sensor harness connector.
  3. Measure the voltage from the 5-volt reference circuit of the TP sensor to a good ground, with a DMM.
  4. Turn ON the ignition.
  5. Lightly touch and move the related engine wiring harnesses and connectors for all 5-volt reference circuits while observing the DMM. Any change in voltage indicates the area where an open, or a short to ground in the 5-volt reference circuit may be found. Refer to Testing for Electrical Intermittents , Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 8  Go to Step 3 
3
  1. Connect the TP sensor.
  2. Install a scan tool and observe the TP sensor voltage parameter.
  3. Lightly touch and move the related engine wiring harnesses and connectors for the TP sensor signal circuit while observing voltage. Any change in voltage indicates the area where an open or a short to ground in the TP sensor signal circuit may be found. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 8  Go to Step 4 
4 Test for poor connections at the TP sensor harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 8  Go to Step 5 
5 Test for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 8  Go to Step 6 
6 
  1. Turn OFF the ignition.
  2. Measure the resistance between the TP sensor signal terminal and the 5-volt reference terminal at the TP sensor using the MIN MAX function on the DMM.
  3. Slowly depress the accelerator pedal to the wide open throttle (WOT) position, then release the pedal back to the closed throttle position several times.
Did you observe a MAX value of infinite ohms or a MIN value of 0 ohms?		 Go to Step 7  Go to Intermittent Conditions
7 Replace the TP sensor. Refer to Throttle Position (TP) Sensor Replacement .
Did you complete the replacement?		 Go to Step 8  -
8
  1. Clear the DTCs with a scan tool.
  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/Failure Records.
Did the DTC fail this ignition?		 Go to Step 2  Go to Step 9 
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 System OK
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