The powertrain control module (PCM) has internal tables that compare manifold absolute pressure (MAP) sensor values with throttle position (TP) sensor values. The MAP sensor is a transducer that varies resistance according to changes in intake manifold pressure (vacuum). The voltage ranges from 1-1.5 volts at idle (low pressure/high vacuum) to 4-4.5 volts at wide open throttle (high pressure/low vacuum). The TP sensor is a potentiometer that varies resistance according to changes in throttle plate position. The voltage ranges from 0.4 (+/-0.2) volts at 0% throttle to 4.7 volts at wide open throttle. DTC P0105 sets when the 2 values are out of the calibrated range from the table values.
DTC Parameters
DTC P0105 will set if MAP sensor voltage or TP sensor voltage is out of range for 2 seconds when:
| • | The engine speed is between 1600-4000 RPM. |
| • | The engine speed change is less than 100 RPM, 50 RPM (2000 Model Year). |
| • | The exhaust gas recirculation (EGR) command is steady (2000 Model Year). |
| • | Idle air control (IAC) change is less than 10 counts (2000 Model Year). |
| • | A/C command is unchanged (2000 Model Year). |
| • | No 5 volt reference, crankshaft position (CKP), EGR, IAC, MAP, PCM internal fault or TP sensor DTCs have been set. |
DTC P0105 diagnostic runs continuously once the above conditions have been met.
DTC P0105 is a type B DTC.
Diagnostic Aids
This DTC will set if either MAP or TP is out of range. To distinguish which one has failed, review Failure Record information and attempt to duplicate the conditions.
Important: Inaccurate readings will occur if resistance measurements are taken on a MAP sensor. The MAP sensor contains an internal amplifier circuit that requires applied voltage to function properly.
Check the PCM and MAP/TP sensors for corrosion in connectors.
Use the scan tool to monitor TP SENSOR as accelerator pedal is slowly depressed. The voltage should change smoothly from 0.4 volts at 0% throttle, to 4.7 volts at wide open throttle (+/- 0.2 volts).
LOW ALTITUDE = HIGH PRESSURE = HIGH VOLTAGE
Altitude | Voltage Range | kPa |
|---|---|---|
BELOW 305 m (BELOW 1,000 ft) | 3.8-5.5 V | 98-100 kPa |
305-610 m (1,000-2,000 ft) | 3.6-5.3 V | 98-95 kPa |
610-914 m (2,000-3,000 ft) | 3.5-5.1 V | 95-92 kPa |
914-1219 m (3,000-4,000 ft) | 3.3-5 V | 92-89 kPa |
1219-1524 m (4,000-5,000 ft) | 3.2-4.8 V | 89-86 kPa |
1524-1829 m (5,000-6,000 ft) | 3-4.6 V | 86-83 kPa |
1829-2133 m (6,000-7,000 ft) | 2.9-4.5 V | 83-80 kPa |
2133-2438 m (7,000-8,000 ft) | 2.8-4.3 V | 80-77 kPa |
2438-2743 m (8,000-9,000 ft) | 2.6-4.2 V | 77-74 kPa |
2743-3948 m (9,000-10,000 ft) | 2.5-4 V | 74-71 kPa |
