P1446
DTC P1446 (74): Battery Module Individual Voltage Input Deviation1. Reset the MCM.
2. Turn the ignition switch ON (II), and wait 1 minute.
Is DTC P1446 indicated?
YES-Go to step 5.
NO-Go to step 3.
3. Start the engine. Raise the engine speed to 3,500 rpm without load (in Park or neutral) until the IMA battery level gauge indicates above 3/4.
4. Drive the vehicle 10 minutes.
Is DTC P1446 indicated?
YES-Update the MCM if it does not have the latest software, or substitute a known-good MCM, then recheck. If the symptom/indication goes away with a known-good MCM, replace the original MCM.
NO-Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the battery module and at the MCM.
5. Turn the ignition switch OFF.
6. Turn the battery module switch OFF.
7. Remove the IPU lid.
8. Measure voltage between these MCM connector terminals:
^ F14 and F6
^ F6 and F13
^ F13 and F5
^ F5 and F4
^ F1 and F7
^ F7 and F2
^ F2 and F8
^ F8 and F3
^ F3 and F9
^ F9 and F10
Is there more than 1.2 V difference between the highest measurement and the lowest?
YES-Replace the battery module.
NO-Update the MCM if it does not have the latest software, or substitute a known-good MCM, then recheck. If the symptom/indication goes away with a known-good MCM, replace the original MCM.