Mazda MX-6 1998, Workshop Manual

Page: 208 / 1282

TROUBLESHOOTING [ENGINE CONTROL KL]
Key On Engine Off (KOEO) Self-Test
Key On Engine Off (KOER) is a functional test of the
PCM performed on demand. A fault must be present
at the time of testing for the Self-Test to detect the
fault. This test will perform checks on certain sensor
and actuator circuits. A Diagnostic Trouble Code
(DTC) will be output on the data link at the end of the
test when requested by the NGS Tester. Only system
pass, hard fault code or an incomplete OBD II drive
mode will be displayed.
Key On Engine Running (KOER) Self-Test
Key On Engine Running (KOER) is a functional test of
the PCM performed on demand with the engine
running and vehicle stopped. A check of the inputs
and outputs Is made during operating conditions and
at normal temperature. The brake on/off, transaxle
control and power steering pressure switch tests are
part of the KOER self-test and MUST be performed
during this operation (see below). A fault must be
present at the time of testing to detect the fault. A
Diagnostic Trouble Code (DTC) will be output on the
data link at the end of the test when requested by the
NGS Tester. Only system pass, hard fault code or an
incomplete OBD II drive mode will be displayed.
Read/Clear Continuous Memory DTC Access
Self-Test
Continuous DTC access is also a functional test of the
powertrain control system. The continuous self-test is
always active. The test consists of all the OBD II
monitors and the comprehensive component monitor,
and is designed to detect failures contributing to
driveability and emission concerns. As part of the an
OBD Test, the technician may perform a specific drive
cycle before running the OBD Test. This is necessary
to detect certain faults not tested during other self-test
operations. All self-tests are menu driven in the NGS
Tester.
Parameter Identification (PID) Access
The PID mode allows access to certain data values,
analog and digital inputs and outputs, calculated
values and system status information.
Brake On/Off Test
This tests ability of the powertrain control system to
detect a state of change in the stop light switch. The
brake pedal
MUST briefly be applied and released on
all vehicles with brake on/off input. This test is done
during the KOER self-test.
Transaxle Control (O/D OFF) Switch Test
This tests ability of the powertrain control system to
detect a state of change in the O/D OFF switch. The
switch
MUST briefly be cycle on all vehicles with a
O/D OFF switch. This test is done during the KOER
self-test.
On-Board Diagnostic Test
New generation star (NGS) tester hook-up
procedure
Note
• Make sure key is off.
1. Insert the vehicle interface module and program
card into the SST (NGS tester) control unit.
P R O G R A M C A R D
T R IG G E R KEY S
V E H IC L E IN TE R FA C E
M O D U L E (VIM )
W 6 U 1 0 1 W K G
Plug the NGS OBD II adapter into the interface
module and the large 5 pin connector into the
vehicle data link connector (DLC) located under
the left side of the center console.
PIN S 1 -8
I f i \ . g g g q g q g g / n
laòùòùòòa/ ^
P IN S 9 - 1 6
DATA LIN K C O N N E C T O R
W 6 U 1 0 1 W H O
3. Plug the SST (NGS tester) tester power cable into
the NGS OBD II adapter power cable connector,
cigarette lighter or use a battery hook-up adapter.
Listen for a double beep. The SST is now
initialized. Begin the functional test of powertrain
control system.
Power Steering Pressure (PSP) Switch Test
This tests the ability of the powertrain control system
to detect a change in power steering fluid pressure.
T h e s te e rin g w h e e l
MUST
b rie fly be tu rn e d at least
1/4 of a revolution. This test is done during the KOER
self-test.
0 1 -0 1 B -2