P0098
DTC P0098: IAT Sensor 2 Circuit High Voltage1. Turn the ignition switch ON (II).
2. Check IAT SENSOR 2 in the DATA LIST with the HDS.
Is about - 40 °F (- 40 °C) or less, or 4.90 V or higher indicated?
YES - Go to step 3.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at IAT sensor 2 and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the IAT sensor 2 2P connector.
5. Connect IAT sensor 2 2P connector terminals No.1 and No.2 with a jumper wire.
6. Turn the ignition switch ON (II).
7. Check IAT SENSOR 2 in the DATA LIST with the HDS.
Is about -40 °F (-40 °C) or less, or 4.90 V or higher indicated?
YES - Go to step 8.
NO - Go to step 16.
8. Turn the ignition switch OFF.
9. Remove the jumper wire.
10. Turn the ignition switch ON (II).
11. Measure voltage between IAT sensor 2 2P connector terminal No.1 and body ground.
Is there about 5 V?
YES - Repair open in the wire between the PCM (A24) and IAT sensor 2, then go to step 18.
NO - Go to step 12.
12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector A (73P).
15. Check for continuity between PCM connector terminal A24 and IAT sensor 2 2P connector terminal No.1.
Is there continuity?
YES - Go to step 22.
NO - Repair open in the wire between the PCM (A24) and IAT sensor 2, then go to step 18.
16. Turn the ignition switch OFF.
17. Replace IAT sensor 2.
18. Turn the ignition switch ON (II).
19. Reset the PCM with the HDS.
20. Do the PCM idle learn procedure.
21. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC is P0098 indicated, check for poor connections or loose terminals at IAT sensor 2 and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Troubleshooting is complete.
22. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
23. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0098 is indicated, check for poor connections or loose terminals at IAT sensor 2 and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.