Chrysler PT Cruiser 2001 Service Manual Supplement page 1962

TRAC and brake warning lamps will illuminate for
4 seconds with ignition on.
AT 20 km/h (12 mph) a dynamic test is performed.
This will momentarily run the pump/motor. If dur-
ing the dynamic test, the driver has his/her foot on
the brake pedal, he/she may feel the test through
brake pedal pulsations. This is a normal condition.
If any component exhibits a diagnostic trouble
code during system initialization or dynamic check,
the CAB will illuminate the ABS and TRAC off
warning lamps.
3.2.2 DIAGNOSTIC MODE
On a Mark 20 system to enter a diagnostic mode,
vehicle speed must be below 10 km/h (6 mph) and
no ABS condition present. If vehicle speed is not
below 10 km/h (6 mph), a ''no response'' message
could be displayed by the DRBIII . The following
are characteristics of diagnostic mode:
•
The amber ABS and red brake warning indicator
will blink rapidly (about 1/2 second on and 1/2
second off). If a hard trouble code is present, such
as CAB Power Feed Circuit diagnostic trouble
code, the indicator will be illuminated without
blinking until the diagnostic trouble condition is
corrected.
• Antilock operation is disabled.
3.2.3 INTERMITTENT DIAGNOSTIC
TROUBLE CODES
If the malfunction is not present while perform-
ing a test procedure, the diagnostic procedures will
not locate the problem. In this case, the code can
only suggest an area to inspect. Check for the
following:
• loose or corroded conditions
• damaged components (sensors, tone wheels)
•
damaged wiring
•
excessive axle shaft runout
• hydraulic system leaks
• regular brake system problems, non-ABS related
If not obvious problems are found, erase diagnos-
tic trouble codes and with the key on, wiggle the
wire harness and connectors. Recheck for codes
periodically as you work through the system. This
procedure may uncover a difficult to locate malfunc-
tion.
3.3 USING THE DRBIII
Refer to the DRBIII user's guide for instructions
and assistance with reading diagnostic trouble
codes, erasing diagnostic trouble codes and other
DRBIII functions.
GENERAL INFORMATION
3.4 DRBIII ERROR MESSAGES
Under normal operation, the DRBIII will dis-
play one of only two error messages:
– User-Requested
Requested COLD Boot
If the DRBIII should display any other error
message, record the entire display and call the
STAR Center for information and assistance. This
is a sample of such an error message display:
ver: 2.14
date: 26 Jul93
file: key_itf.cc
date: Jul 26 1993
line: 548
err. 0x1
User-Requested COLD Boot
Press MORE to switch between this display
and the application screen.
Press F4 when done noting information.
3.4.1 DRBIII DOES NOT POWER UP
(BLANK SCREEN)
If the LED's do not light or no sound is emitted at
start up, check for loose cable connections or a bad
cable. Check the vehicle battery voltage (data link
16-way connector cavity 16). A minimum of 11 volts
is required to adequately power the DRBIII . Also
check for a good ground at the DLC.
If all connections are proper between the
DRBIII and the vehicle or other devices, and the
vehicle battery is fully charged, an inoperative
DRBIII may be the result of faulty cable or vehicle
wiring.
3.4.2 DISPLAY IS NOT VISIBLE
Low temperatures will affect the visibility of the
display. Adjust the contrast to compensate for this
condition.
5
WARM Boot or User-