2004 ISUZU TF SERIES Workshop Manual

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Page 2305 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-309
Step Action Value (s) Yes No

Breaker box is not available:
1. Ignition "Off", engine "Off".
2. Disconnect the TCM connector and ECM
conn

Page 2306 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-310 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) U2104 (FLASH CODE 67) CAN BUS
RESET COUNTER OVER-RUN

RTW46EMF000301
Condition For Setting The DTC and Action Take

6E-310 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) U2104 (FLASH CODE 67) CAN BUS
RESET COUNTER OVER-RUN

RTW46EMF000301
Condition For Setting The DTC and Action Taken When The DTC Sets
Flash
Code Code Type DTC Name DTC Setting Condition Fail-Safe (Back Up)
67 U2104 D CAN BUS Reset
Counter Overrun 1. No DTC CAN BUS Off.
2. CAN valid counter does not change for 2 seconds. Torque reduction control is disable.

CIRCUIT DESCRIPTION
The engine control system in 6VE1 uses high speed
CAN bus system. The individual CAN bus systems are
connected via two interfaces and can exchange
information and data. This allows control modules tha
t
are connected to different CAN bus systems to
communicate. Engine control modules (ECM) in the
vehicle that require continuous, rapid communication
are connected to the high speed CAN bus. The engine
is continuously notified of the current engine load
status. Since the ECM has to react immediately to load
status changes, rapid communication is required
between the ECM and the automatic transmission
control module. The high speed CAN bus in the 6VE1 is
designed as a two-wire CAN bus (twisted pair). The
wires are shielded and twisted. The engine rate is 500
K
band.

DIAGNOSTIC AIDS
Inspect the wiring for poor electrical connection at the
ECM. Look for possible bent, backed out, deformed
or damaged terminals. Check for weak terminal
tension as well. Also check for a chafed wire tha
t
could short to bare metal or other wiring. Inspect for a
broken wire inside the insulation.
When diagnosing for a possible intermittent short o
r
open condition, move the wiring harness while
observing test equipment for a change.
Inspect the wiring for EMI (Erectro-Magnetic
Interference). Check that all wires are properly routed
away from coil, and generator. Also check fo
r
improperly installed electrical options. When this test
is performed, turn “OFF" on electronic auto parts
switches to improperly for a noise preventing.

Page 2307 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-311
Diagnostic Trouble Code (DTC) U2104 (Flash Code 67) CAN Bus Reset
Counter Over-Run

Step Action Value (s) Yes No
1
Was the "On-Board Diagnostic

Page 2308 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-312 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
7
Using the DVM and check the CAN BUS high circuit.
1. Ignition "Off", engine "Off".
2. Disconnect the TCM conn

Page 2309 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-313
Step Action Value (s) Yes No
10
Repair the open circuit between the ECM CAN BUS
high and low circuit.
Was the problem solved?
E-60(A)

Page 2310 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-314 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
11

Using the DVM and check the CAN BUS high circuit.
Breaker box is available:
1. Ignition "Off", engine "Off"

Page 2311 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-315
Step Action Value (s) Yes No
12

Using the DVM and check the CAN BUS low circuit.
Breaker box is available:
1. Ignition "Off", engine "Off".

Page 2312 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-316 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
15
Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of

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