Mitsubishi Galant 9G. Manual — part 1546

COMBINATION METER ASSEMBLY

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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

COMBINATION METER ASSEMBLY

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CHASSIS ELECTRICAL

54A-57

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness A (Vehicles with CAN

communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Diagnose the CAN bus line.
Q: Is the check result satisfactory?

YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C,

Diagnosis-Can Bus Diagnostic Chart

P.54C-14

). On

completion, go to Step 6.

STEP 2. Using scan tool MB991958, read the MFI system
diagnostic trouble code.
Check if an MFI system DTC is set.
Q: Is the DTC set?

YES : Diagnose the MFI system by referring to GROUP

13A, MFI Diagnosis

− Diagnostic Trouble Code Chart

P.13A-33

or GROUP 13B, MFI Diagnosis

−

Diagnostic Trouble Code Chart

P.13B-34

.

NO : Go to Step 3.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

COMBINATION METER ASSEMBLY

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CHASSIS ELECTRICAL

54A-58

STEP 3. Using scan tool MB991958, read the diagnostic
trouble code related to the other system.
Check if a DTC, which relates to CAN communication-linked
systems below, is set.
ABS-ECU

• DTC U1100: Powertrain control module time-out (related

to Engine) <vehicles with TCL>

• DTC U1101: Powertrain control module time-out (related

to automatic transmission) <vehicles with TCL>

Multi-center display

• DTC 011: Powertrain control module time-out (related to

Engine)

• DTC 012: Powertrain control module time-out (related to

A/T)

ETACS-ECU

• DTC 011: Powertrain control module time-out (related to

Engine)

• DTC 012: Powertrain control module time-out (related to

A/T)

A/C-ECU

• DTC U1100: Powertrain control module time-out (related

to Engine)

Q: Is the DTC set?

YES : Go to Step 4.
NO : Go to Step 5.

STEP 4. Recheck for diagnostic trouble code.
Recheck if the DTC is set.

1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.

Q: Is the check result satisfactory?

YES : A poor connection, open circuit or other intermittent

malfunction is present in the CAN bus lines between
the powertrain control module and the combination
meter (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-14

).

NO : Replace powertrain control module and then go to

Step 6.

COMBINATION METER ASSEMBLY

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CHASSIS ELECTRICAL

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STEP 5. Recheck for diagnostic trouble code.
Recheck if the DTC is set.

1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.

Q: Is the check result satisfactory?

YES : A poor connection, open circuit or other intermittent

malfunction is present in the CAN bus lines between
the powertrain control module and the combination
meter (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-14

).

NO : Replace combination meter and then go to Step 6.

STEP 6. Recheck for diagnostic trouble code.
Recheck if the DTC is set.

1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.

Q: Is the check result satisfactory?

YES : The procedure is complete.
NO : Go to Step 1.

DTC U1102: ABS-ECU Time-out

CAUTION

If DTC U1102 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

The combination meter communicates with the
ABS-ECU through CAN bus lines. If it can not
receive all the necessary signals from the ABS-ECU,
DTC U1102 is set.

.

TECHNICAL DESCRIPTION (COMMENT)

CAUTION

If the ignition switch is turned to the ON position
without starting the engine, DTC (past trouble)
U1100, U1101 and U1102 may be set on the com-
bination meter after one minutes.

Current trouble

• Connector(s) or wiring harness in the CAN bus

lines between the ABS-ECU and the combination
meter, the power supply system to the ABS-ECU,
the ABS-ECU itself, or the combination meter
may be defective.