Drivetrain Troubleshooting Information - Honda TRX680FA Service Manual

DRIVETRAIN SYSTEM
DRIVETRAIN TROUBLESHOOTING
INFORMATION
Refer to "PGM-FI Troubleshooting Information" for
the general troubleshooting information (page 6-
13).
SYSTEM DESCRIPTION
SELF-DIAGNOSIS SYSTEM
The PCM (Powertrain Control Module) integrates
the ECM (Engine Control Module), the TCM (Trans-
mission Control Module) and the selectable 4WD
system control. Therefore some detection items are
shared by the PGM-FI and drivetrain system and
they may affect the system operation of both sys-
tems.
And the drivetrain system is equipped with the self-
diagnostic system. When any abnormality occurs in
the A/T or selectable 4WD system, the PCM turns on
the indicators blinking and stores a DTC in its eras-
able memory for the relevant system failure.
In case of a function failure in the A/T system (e.g.:
Shift solenoid valve failure), the gear position indi-
cator will blink "- -" to indicate the DTC.
In case of a function failure in the both, A/T and
selectable 4WD, system, both the indicators will
blink at the same time to indicate the DTC.
FAIL-SAFE FUNCTION
The drivetrain system is provided with a fail-safe
function to secure a minimum running capability
even when there is trouble in the system.
When the PCM detects a problem in the A/T system,
the PCM stops the automatic shift function and anti-
creep function, and defaults the transmission into
2nd gear. Also, the gear position indicator blinks
" - - " to indicate the DTC.
When the PCM detects a problem in the selectable
4WD system, the PCM stops controlling the system
and defaults into the 2WD mode. Also, the 4WD
indicator blinks to indicate the DTC.
DTC (Diagnostic Trouble Code)
Refer to the DTC information in "Fuel system (PGM-
FI)" (page 6-13).
FA model shown:
GEAR POSITION INDICATOR
4WD INDICATOR
14-20