P0A3C
DTC P0A3C (39): MCM OverheatingNOTE: If the IPU module fan duct is blocked, DTC P0A3C may be detected.
1. Turn the ignition switch ON (II).
2. Check for IMA system Temporary DTCs or DTCs with the HDS.
Is DTC P1448 (63) indicated?
YES - Do the troubleshooting for DTC P1448 (63).
NO - Go to step 3.
3. Check the MPI TEMPERATURE. in the DATA LIST with the HDS.
Is more than 212°F (100°C) indicated?
YES - Go to step 4.
NO - Intermittent failure, system is OK at this time. Check for block at the IPU module fan inlet duct.
4. Check the IPU module air duct or IPU module fan for disconnections, damage, or obstructions, and check the IPU lid installation.
Is the IPU module air duct, IPU module fan, and IPU lid OK?
YES - Go to step 8.
NO - Repair the IPU module air duct, IPU module fan, or IPU lid as necessary, then go to step 5.
5. Turn the ignition switch ON (II).
6. Reset the MCM with the HDS.
7. Check for IMA system Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P16C3 (39) is indicated, check for poor connections or loose terminals at the DC-DC converter and the MCM, 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.
8. Update the MCM if it does not have the latest software, or substitute a known-good MCM.
9. Check for IMA system Temporary DTCs or DTCs with the HDS.
Is DTC P0A3C (39) indicated?
YES - Check for poor connections or loose terminals at the MCM. If the MCM was updated, substitute a known-good MCM, then recheck. If the MCM was substituted, go to step 1.
NO - If the MCM was updated, troubleshooting is complete. If the MCM was substituted, replace the original MCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.