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3. MAP SENSOR OPERATION Start the engine. With a scan tool, monitor the MAP Sensor voltage. Snap the throttle. Does the MAP Sensor voltage vary from below 2.0 volts at idle to above 3.5 volts at wide open throt- Yes >> Go to 5 No >> Go to 4 4. MAP SENSOR Turn the ignition off. Disconnect the MAP Sensor harness connector. Disconnect the PCM harness connector. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP Sensor and the Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Check each of the MAP Sensor circuits for high resistance or a shorted condition. Were any problems found? Yes >> Repair as necessary. Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Replace the MAP Sensor. Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). 5. THROTTLE FOLLOWER TEST Ignition on, engine not running. With a scan tool, perform the Throttle Follower Test and monitor the TP Sensor 1 and TP Sensor 2 voltages. Slowly press the throttle pedal down. The voltage for TP Sensor 1 should start at approximately 0.3 volts and increase to above 4.7 volts. The voltage for TP Sensor 2 should start at approximately 4.7 volts and decrease to approximately 0.3 volts. Is the voltage within the range specified for each sensor? Yes >> Go to 7 No >> Go to 6 PM ENGINE ELECTRICAL DIAGNOSTICS - GPEC 9 - 823 |