1998 Dodge Truck ENGINE IDLE ROUGH

It can, also check your idle air control, it's bolted to the throttlebody.
TEST TC-31A: ECT SENSOR VOLTAGE TOO HIGH NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION. For component location and wiring diagram, see WIRING DIAGRAMS article. Using scan tool, read Engine Coolant Temperature (ECT) sensor voltage. If voltage is more than 4.5 volts, go to step 5). If voltage is 4.5 volts or less, go to next step. 1. Wiggle wiring harness and connector going to ECT sensor while monitoring ECT sensor voltage. If voltage changes while wiggling wiring harness, repair wiring harness and connector as necessary and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies. If voltage does not change while wiggling wiring harness, go to next step. 2. Conditions required to set DTC is not present at this time. ECT SENSOR VOLTAGE TOO HIGH DTC sets if ECT sensor voltage at Powertrain Control Module (PCM) is more than 4.98 volts for more than 3 seconds. Possible causes are: defective connections or open ECT sensor wiring, defective ECT sensor or PCM. Go to next step. 3. Inspect all related wiring and connectors. Repair defective wiring and connections as necessary and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies. If wiring and connectors are okay, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies. 4. Disconnect ECT sensor connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A: ROAD TEST FOR OBD- II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies. If connector and terminals are okay, go to next step. 5. On AB, AN, BE/BR and DN bodies, go to next step. On TJ, XJ and ZJ bodies, use scan tool to read ECT sensor voltage. If voltage is more than 4 volts, replace ECT sensor perform TEST VER-2A: ROAD TEST VERIFICATION. If voltage is 4 volts or less, go to step 10). 6. On AN, BE/BR and DN bodies, go to next step. On AB body, use an external voltmeter to check voltage on ECT sensor connector, signal circuit (Tan/Black wire). If voltage is more than 6 volts, repair signal circuit for short to voltage and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES. If voltage is 6 volts or less, go to next step. 7. Connect a jumper wire between ECT sensor connector, signal circuit (Tan/Black wire) and ground circuit (Black/Light Blue wire). Using scan tool, read ECT sensor voltage. If voltage is less than one volt, replace ECT sensor and perform TEST VER-5A: ROAD TEST FOR OBD -II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies. If voltage is one volt or more, go to next step. 8. Remove jumper wire from ECT sensor connector. Reconnect jumper wire between ground and ECT sensor connector, ground circuit (Black/Light Blue wire). Using scan tool, read ECT sensor voltage. If voltage is less than one volt, repair open sensor ground circuit and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies. If voltage is one volt or more, go to next step. 9. Turn ignition off. Disconnect PCM connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A: ROAD TEST 10. FOR OBD-II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies. If connector and terminals are okay, go to next step. Using an external ohmmeter, check resistance of signal circuit (Tan/Black wire) between ECT sensor connector and PCM Black connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies. If resistance is 5 ohms or more, repair open signal circuit and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES on AB body, or TEST VER-2A: ROAD TEST VERIFICATION on all other bodies. 11.