DTC P0108: MAP SENSOR VOLTAGE TOO HIGH Dodge Ram Wagon B1500

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0108: MAP SENSOR VOLTAGE TOO HIGH is monitored when engine speed is more than 416 RPM but less than 3520 RPM, Throttle Position (TP) sensor voltage is less than 1.13 volt and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses Manifold Absolute Pressure (MAP) sensor voltage is more than 4.88 volts for 2.2 seconds with engine running. Possible causes are: defective MAP sensor, defective PCM, defective connectors or defective wiring.

1. Start engine and allow it to idle. Using scan tool, read MAP sensor voltage. If voltage is more than 4.6 volts, go to next step. If voltage is 4.6 volts or less, go to step 7).
2. Turn ignition off. Disconnect MAP sensor connector. (Схема №19) Clean and/or repair connectors as necessary. Connect a jumper wire between ground and MAP sensor connector, sensor ground circuit (Black/Light Blue wire). Turn ignition on, with engine off. Using scan tool, read MAP sensor voltage. If voltage is less than one volt, repair open in MAP sensor ground circuit. Perform TEST VER-5A. If voltage is one volt or more, go to next step.
3. Turn ignition off. Ensure MAP sensor connector is still disconnected. (Схема №19) Clean and/or repair connectors as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on MAP sensor connector, signal circuit (Dark Green/Red wire). If voltage is more than 5.5 volts, repair signal circuit shorted to voltage. Perform TEST VER-5A. If voltage is 5.5 volts or less, go to next step.
4. Turn ignition off. Ensure MAP sensor connector is still disconnected. (Схема №19) Clean and/or repair connectors as necessary. Connect a jumper wire between MAP sensor connector, signal circuit (Dark Green/Red wire) and sensor ground circuit (Black/Light Blue wire). Turn ignition on, with engine off. Using scan tool, read MAP sensor voltage. If voltage is less than one volt, replace MAP sensor. Perform TEST VER-5A. If voltage is one volt or more, go to next step.
5. Turn engine off. Ensure MAP sensor connector is still disconnected. (Схема №19) Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of MAP sensor connector, signal circuit (Dark Green/Red wire) between MAP sensor and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open signal circuit. Perform TEST VER-5A.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Start engine and allow it to idle. Wiggle MAP sensor connector and wiring harness while monitoring MAP sensor voltage. If voltage goes to more than 4.6 volts while wiggling connectors and wiring harness, repair connectors and wiring harness that caused voltage to change. Perform TEST VER-5A. If voltage stays at 4.6 volts or less, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC P0108: MAP SENSOR VOLTAGE TOO HIGH returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0108: MAP SENSOR VOLTAGE TOO HIGH does not return, see «INACTIVE DTC CONDITION»(ref-139160-S32382818132002042600000). Test is complete.