LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2004 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (DTC P0506 To P1640) >> Engine Controls Diagnosis >> DTC P1106 >> Test Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test Description

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

  1. 3:  Many intermittent open or shorted circuits occur with harness/connector movement caused by vibration, by engine torque, and by bumps. This step attempts to recreate this condition.
DTC P1106 - MAP Sensor Circuit Intermittent High Voltage

Step Action Values 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. Start the engine.
  2. Monitor the diagnostic trouble code (DTC) information with the scan tool.
Does the scan tool display DTC P0641 or P0108 set?		 - Go to Diagnostic Trouble Code (DTC) List Go to Step 3 
3 
  1. Observe the MAP sensor parameter with the scan tool.
  2. Attempt to induce the fault that set the DTC by manipulating the following items:
    • The MAP sensor wiring harness
    • The MAP sensor connector
    • The PCM connector
Refer to Inducing Intermittent Fault Conditions in Wiring Systems and Intermittent Conditions .Is the MAP sensor voltage affected during any part of the test?		 - Go to Step 4  Go to Step 8 
4 Test the low reference circuit between the PCM and the MAP sensor for an intermittent open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 8  Go to Step 5 
5
IMPORTANT: Disconnecting the PCM may eliminate the short during the testing.
Test the MAP sensor signal circuit between the PCM and the MAP sensor for an intermittent short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.Did you find and correct the condition?		 - Go to Step 8  Go to Step 6 
6 Test for an intermittent and for a poor connection at the MAP sensor. Refer to Testing for Continuity and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 8  Go to Step 7 
7 Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Continuity and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - 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
scientia non olet · About LEMON Manuals