COMBINATION METER ASSEMBLY
TSB Revision
CHASSIS ELECTRICAL
54A-56
DTC U1100: Powertrain Control Module Time-out (Related to Engine) DTC U1101: Powertrain Control
Module Time-out (Related to A/T)
CAUTION
If DTC U1100 or U1101 is set in the combination
meter, always diagnose the CAN bus lines.
CAUTION
Whenever the ECU is replaced, ensure that the
communication circuit is normal.
.
CIRCUIT OPERATION
Refer to
P.54A-53
.
.
DTC SET CONDITION
U1100
• The combination meter receives engine control
system-related signals from the powertrain con-
trol module via CAN bus lines. If the display unit
can not receives the necessary signals, DTC
U1100 will be set.
U1101
• The combination meter receives A/T control sys-
tem-related signal from the powertrain control
module via CAN bus lines. If the display unit can
not receive the necessary signals, DTC U1101
will be set.
.
TECHNICAL DESCRIPTION (COMMENT)
CAUTION
If the ignition switch is turned to the ON position
without starting the engine, DTC (past trouble)
017 and 018 may be set on the combination
meter (incorporating meter-ECU) after three min-
utes.
Current trouble
• Connector(s) or wiring harness in the CAN bus
lines between the powertrain control module and
the combination meter, the power supply system
to the powertrain control module, the powertrain
control module itself, or the combination meter
may be defective.
Past trouble
• Carry out diagnosis with particular emphasis on
connector(s) or wiring harness in the CAN bus
lines between the powertrain control module and
the combination meter, and the power supply
system to the powertrain control module. For
diagnosis procedures, refer to "How to cope with
past trouble" (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
P.00-14
).
NOTE: For a past trouble, you may not find it by
the MUT-III CAN bus diagnostics even if there is
any failure in CAN bus lines. In this case, refer to
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points
−
How to Cope with Intermit-
tent Malfunction
P.00-14
.) and check the CAN
bus lines. You can narrow down the possible
cause of the trouble by referring to the DTC,
which is set regarding the CAN communica-
tion-linked ECUs (Refer to GROUP 54C, CAN
bus line Diagnostics Flow
P.54C-6
).
.
TROUBLESHOOTING HINTS
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector.
• Malfunction of powertrain control module.
• Malfunction of combination meter