92
TAMD72P: Electronic Diesel Control (EDC) control
panel for single control point
Diagnostic functions – OBD system
(TAMD72P)
The indicator lamp in the yellow Diagnosis button on
the EDC system control panel starts to flash if the
system receives abnormal signals or if there is a mal-
function in the EDC system.
Press the button for at least one second in order to
read off the Diagnostic Trouble Code (DTC) and to
cancel the alarm. A DTC message is flashed as a
two-stage code.
If there are several DTCs stored the next DTC is
flashed when the button is pushed again. When the
first DTC is repeated, all the codes have been read
off.
DTCs (Diagnostic Trouble Codes) are stored until
erased. This should be done after the malfunction or
source of the DTC has been identified and repaired.
NOTE! If the OBD (On-board Diagnostics) system
has triggered an event (for example stopped the
engine) you must erase the DTC before the en-
gine can be restarted. Refer to Erasing Diagnos-
tic Trouble Codes (DTC) below.
Reading off Diagnostic Trouble Codes (DTC)
Pressing the Diagnosis button when the light is flash-
ing will enable the system to relay the DTC code
message in the form of a flashed two-stage DTC
code.* First a number of flashes (units of ten), fol-
lowed by a short pause, then a series of new flashes
(single units)
After the alarm has been acknowledged (DTCs have
been read off) the light will go out. Stored DTCs can
be read off again by pressing the yellow button.
Refer to the section EDC Diagnostic Trouble Codes
(DTC) on pages 93–95 for an explanation of the
flashed code sequences.
Note! Service technicians can obtain a read out in
plain language using the diagnostics Scan Tool
(Diagnostic Key).
*Example: pause = DTC 2.6
(Fault on the control unit potentiometer).
Erasing stored Diagnostic Trouble Codes (DTC)
1. Check the key switch is in the 0 position.
2. Press the yellow Diagnosis button and hold it in
while turning the key switch to the I (operating)
position. Keep the button pressed down for a fur-
ther period of at least 3 seconds.
Note. If the Diagnosis button is pushed again af-
ter the stored Diagnostic Trouble Codes have
been erased, DTC 1.1 (“No fault”) is flashed.
TAMD72P: Electronic Diesel Control (EDC) control
panel, for multiple control positions
DIAGNOSIS
DIAGNOSIS
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