Honda ACCORD HYBRID 2005 Service Manual page 738

IMA System
D T C T r o u b l e s h o o t i n g ( c o n t ' d )
DTC P0A94 (48): DC-DC Converter Output
Low Voltage
1. T u r n the ignition switch ON (II).
2. Check for T e m p o r a r y DTCs or DTCs w i t h the HDS.
Is DTC U1221 or P0562 indicated?
Y E S — D o the troubleshooting for DTC U1221
(see page 12-131), or DTC P0562 (see page 12-33).
N O — G o t o step 3.
3. Reset the M C M (see page 12-6).
4. Check under these conditions:
• Headlights on high beam
• Blower fan at m a x i m u m speed
• Rear w i n d o w defogger on
5. Start the engine, and let it idle 2 minutes.
6. Check for T e m p o r a r y DTCs or DTCs w i t h the HDS.
Is DTC P0A94 indicated?
Y E S — G o to step 7.
NO—Intermittent failure, system is OK at this t i m e .
Check for poor connections or loose terminals at
the DC-DC converter, + B t e r m i n a l (on the under-
hood fuse/relay box), and the M C M . i
7. Start the engine.
8. Measure voltage between 12 V battery terminals
+ t e r m i n a l and — t e r m i n a l .
9. Compare the 12 V battery voltage and the M C M
BACK UP VOLTAGE in the DATA LIST w i t h the HDS.
Is there more than 2.0 V difference between 12 V
battery voltage and MCM BACK UP VOLTAGE?
Y E S — G o t o step 22.
N O — G o t o step 10.
10. Turn the ignition switch OFF.
11. Check the under-hood fuse/relay box + B terminal
(ORN wire) connection.
Is the connection OK?
Y E S — G o t o step 12.
NO—Repair connection in the w i r e + B t e r m i n a l ,
then go to step 15.
12. Turn the battery module switch OFF (see page 12-4).
13. Remove the IPU lid (see page 12-140).
14. Check the + B connector (A) on the DC-DC
converter.
Is the connection OK?
YES—Replace the DC-DC converter (see page
12-143), then go to step 15.
NO—Repair the + B connector on the DC-DC
converter as necessary, then go t o step 15.
15. Reconnect all connectors.
16. Reinstall the IPU lid (see page 12-140), then t u r n the
battery module switch ON (see page 12-4).
17. Turn the ignition switch ON (II).
18. Reset the M C M (see page 12-6).
12-60