DTC 20
DTC 20: Motor Power Inverter (MPI) Module Current Signal Circuit High Input1. Reset the MCM.
2. Turn the ignition switch ON (II).
Is DTC 20 indicated?
YES- Go to step 3.
NO- Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the MPI module current sensor and at the MCM.
3. Turn the ignition switch OFF.
4. Turn the battery module switch OFF.
5. Remove the IPU lid.
6. Turn the ignition switch ON (II).
7. Measure voltage between MCM connector terminals B18 and B25.
Is there less than 4.8 V?
YES- Substitute a known-good MCM and recheck. If the symptom/indication goes away, replace the original MCM.
NO- Go to step 8.
8. Measure voltage between MCM connector terminals B25 and C24.
Is there about 5 V?
YES- Go to step 9.
NO- Substitute a known-good MCM and recheck. If the symptom/indication goes away, replace the original MCM.
9. Turn the ignition switch OFF.
10. Disconnect the junction board 16P connector.
11. Turn the ignition switch ON (II).
12. Measure voltage between the junction board 16P connector terminals No. 3 and No. 11.
Is there about 5 V?
YES- Replace the battery module.
NO- Repair open in the wire between the MCM (B25) and the junction boarded