P0106

DTC P0106

CIRCUIT DESCRIPTION




The engine control module (ECM) supplies a 5-volt reference circuit and a low reference circuit to both the throttle position (TP) sensor and the manifold absolute pressure (MAP) sensor. The TP sensor sends a voltage signal back to the ECM relative to the throttle plate opening, and the MAP sensor sends a voltage signal back to the ECM relative to the intake manifold pressure. The ECM can detect if the TP sensor or the MAP sensor are out of range by comparing the two values against the high and low limits and engine speed defined within the engine calibration. If the TP or the MAP are not within the expected limits of the engine calibration, DTC P0106 is set.

CONDITIONS FOR RUNNING THE DTC
DTCs P0107, P0108, P0122, P0123, P0506, P0507, P0602, P0606, P0641 are not set.
- The engine speed is between 1,600-4,000 RPM.
- The change in engine speed is less than 50 RPM.
- The torque converter clutch (TCC) is stable to within 1.2 percent.
- The idle air control (IAC) valve is stable to within 5 counts.
- The above conditions are met for 1.5 seconds.

CONDITIONS FOR SETTING THE DTC
The MAP sensor or the TP sensor is out of an expected range defined by the engine calibration for 20 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

DIAGNOSTIC AIDS
- If a DTC P0106 cannot be duplicated, the information included in the Freeze Frame/Failure Records data can be useful. Use the scan tool DTC information data in order to determine the status of the DTC.
- A TP sensor that is stuck may attempt to auto zero every time the engine runs. An indication if this happens is the TP percentage will be 0 percent and TP voltage will be high.
- The MAP sensor needs a dedicated vacuum source. Inspect the MAP sensor and the MAP sensor vacuum source for a vacuum leak.
- Inspect for corroded terminals at the following connectors:
- The MAP sensor
- The TP sensor
- The ECM

TEST DESCRIPTION

Steps 1-7:

Steps 8-14:

Steps 15-24:

Steps 25-28:

The numbers below refer to the step numbers on the diagnostic table.
8. While starting the engine, the MAP sensor should detect any changes in manifold pressure. This test is to determine if the sensor is stuck at a value.
9. A normal MAP sensor will react as quickly to the throttle changes. A MAP sensor should not appear to be "lazy" or catch up with the throttle movements.
14. This step calculates the resistance in the 5-volt reference circuit of the MAP sensor.
15. This step calculates the resistance in the low reference circuit of the MAP sensor.
17. This step calculates the resistance in the 5-volt reference circuit of the TP sensor.
18. This step calculates the resistance in the low reference circuit of the TP sensor.