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P0129-BAROMETRIC PRESSURE OUT-OF-RANGE LOW (CONTINUED) 2. (F856) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the MAP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F856) 5-volt Supply circuit in the MAP Is the voltage between 4.5 to 5.2 volts? Yes >> Go To 3 No >> Go To 7 3. MAP SENSOR With a scan tool, monitor the MAP Sensor voltage with the Sensor harness connector disconnected. Is the voltage above 2.2 volts? Yes >> Replace the MAP Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 4 4. (K1) MAP SIGNAL CIRCUIT OPEN Turn the ignition off. Disconnect the C2 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing Is the resistance below 5.0 ohms? Yes >> Go To 5 No >> Repair the open in the (K1) MAP Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 155 |