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P2174-LOW AIRFLOW/RESTRICTION DETECTED (INSTANTANEOUS ACCUMULATION) (CONTINUED) 12. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F856) 5-volt Supply Is the resistance above 100k ohms? Yes >> Go To 13 No >> Repair the short to ground in the (F856) 5-volt Supply cir- cuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer 13. MAP SENSOR Connect the PCM harness connectors. Ignition on, engine not running. With a scan tool, monitor the MAP Sensor voltage. Connect a jumper wire between the (K1) MAP Signal circuit and the Cycle the ignition switch from off to on. With a scan tool, monitor the MAP Sensor voltage. Does the scan tool display MAP voltage from approximately 4.9 Yes >> Replace the MAP Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 14 NOTE: Remove the jumper wire before continuing. 9 - 992 ENGINE ELECTRICAL DIAGNOSTICS WK |