Test Dm: Manifold Absolute Pressure Sensor & Thermal Manifold Absolute Pressure Sensor: Testing
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION table of fault code setting condition.
FAULT CODE SETTING CONDITION
| Fault Code | KOEO | KOER | Continuous Memory |
|---|---|---|---|
| P0107 | DM1 | DM1 | DM6 |
| P0108 | DM1 | DM1 | DM6 |
- 1) For KOEO & KOER Only DTC P0107 Or P0108: Check Voltage Between VREF & SIG RTN At MAP/TMAP Sensor
DTC P0107 indicates TMAP sensor reference voltage fell below calibrated limit of .25 volt. DTC P0108 indicates TMAP sensor reference voltage exceeded calibrated limit of 5 volts. Possible causes for these faults are:- VREF Circuit Open, Shorted To Ground Or VPWR
- TMAP Signal Shorted To VPWR
- Faulty TMAP Sensor
- Faulty PCM
Turn ignition switch to OFF position. Disconnect MAP/TMAP sensor connector. Using a DVOM, measure voltage between SIG RTN and VREF circuits at MAP/TMAP harness connector. See Figure-Figure . If voltage measurement is 4-6 volts, go to next step. If voltage measurement is not 4-6 volts, go to TEST C, step 1).
- 2) Check MAP/TMAP Sensor Operation
Connect 2 jumper wires to complete VREF and SIG RTN circuits between MAP/TMAP sensor harness connector and MAP/TMAP sensor connector. Start engine and allow to idle. Using a DVOM, measure voltage on MAP circuit between MAP/TMAP sensor connector and chassis ground. Observe voltage while rapidly increasing engine speed to 3000 RPM by depressing accelerator pedal and then releasing. If voltage rapidly increases to more than 2 volts and then decreases to less than one volt, go to step 4). If voltage does not rapidly increase to more than 2 volts and then decrease to less than one volt, go to next step. - 3) Determine Sensor Replacement
If vehicle equipped with EGR System Module (ESM) type EGR, replace DPFE/MAP sensor. If vehicle is not equipped with ESM type EGR, replace TMAP sensor. - 4) Check MAP/TMAP Circuit For Short To VREF & SIG RTN In Harness
Turn ignition switch to OFF position. Disconnect PCM connector. Using a DVOM, measure resistance between MAP/TMAP circuit and both VREF and SIG RTN circuits at MAP/TMAP sensor harness connector. See Figure-Figure If each resistance is more than 10 k/ohms, go to next step. If either resistance is 10 k/ohms or less, repair short between circuits. - 5) Check MAP/TMAP Sensor Circuit For Open In Harness
Ensure ignition switch is in OFF position and PCM is disconnected. Using a DVOM, measure resistance of MAP circuit between PCM harness connector and MAP/TMAP sensor harness connector. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open in TMAP circuit. - 6) Continuous Memory DTC P0107 & P0108: Check For Intermittent Circuits To MAP/TMAP Sensor
Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position. Using scan tool, access MAP V PID from PID/DATA MONITOR & RECORD menu. Observe MAP V PID voltage for indication of fault while shaking and bending MAP/TMAP sensor wiring harness and connector. Tap lightly on MAP/TMAP sensor to simulate road shock. An indication of fault is a sudden change in MAP V PID voltage. If a fault is indicated, isolate and repair as necessary. If no fault is indicated, fault is unable to be duplicated at this time. Go to TEST Z, step 1) .
NOTE:
For additional testing information, see DIAGNOSTIC AIDS .