PGM-FI SYSTEM
PG
BLESHOOTING INFORMATION ('13 MOD L)
GENERAl
TROUBlESHOOTING
Intermittent Failure
The term "intermittent failure" means a system may have had a failure, but it checks OK now. If the MIL does not come on, check
for poor contact
or
loose pins at all connectors related to the affected circuit. If the MIL was
on,
but then went out, the original
problem may be intermittent.
Opens and Shorts
"Opens" and "Shorts" are common electrical terms. An open is a break
in
a wire or at a connection. A short
is
an
accidental
connection
of
a wire to ground
or
to another wire.
In
simple electronics, this usually means something will not work at all. With
ECMs this can mean something may work, but not the way it's supposed to.
If the MIL has come
on
Refer to DTC READOUT (page 4-11
).
If the MIL did not stay
on
If the MIL did not stay
on,
but there is a driveability problem, do the SYMPTOM TROUBLESHOOTING (page 4-7).
SYSTEM DESCRIPTION
SELF-DIAGNOSIS SYSTEM
The PGM-FI system is equipped with the self-diagnostic system. When any abnormality occurs
in
the system, the ECM turns
on
the
MIL (Malfunction Indicator Lamp) and stores a OTC
in
its erasable memory.
FAIL-SAFE FUNCTION
The PGM-FI system is provided with a fail-safe function to secure a minimum running capability even when there is trouble
in
the
system. When any abnormality
is
detected by the self-diagnosis function, running capability is maintained by pre-programed value
in
the simulated program map. When any abnormality is detected
in
the fuel injector and/or CKP sensor, the fail-safe function stops
the engine to protect it from damage.
DTC (Diagnostic Trouble Code}
The OTC is composed
of
a main code and a sub code and it is displayed as a hyphenated number when retrieved from the ECM
with the MCS tester.
The digits
in
front
of
the hyphen are the main code, they indicate the component
of
function failure.
The digits behind the hyphen are the sub code, they detail the specific symptom
of
the component or function failure.
For example,
in
the case
of
the TP sensor:
- OTC 8 - 1 = (TP sensor voltage) - (lower than the specified value).
- OTC 8 - 2 = (TP sensor voltage) - (higher than the specified value).
• The MAP, ECT, TP and IAT sensor diagnosis will be made according to the voltage output of the affected sensor.
If a failure occurs, the ECM determines the Function Failure, compares the sensor voltage output to the standard value, and
then outputs the corresponding OTC to the MCS Tester.
MIL BLINK PATTERN
• DTC can
be
read by the MIL [1] blink pattern.
•
In
case the ECM does not detect any problem at present, when the
ignition switch is turned
ON
and engine stop switch
"0",
the MIL will stay
on for a few seconds, then go off.
•
In
case the ECM detects the problem at present, when the ignition
switch is turned ON and engine stop switch
"0",
the MIL will stay on for a
few seconds and go off, then the MIL blinks the DTC (Except MIL 52
blinks: CKP sensor).
• The engine must be cranked to indicate MIL 52 blinks (CKP sensor), as
the ECM can detect CKP sensor malfunction only when the engine is
cranking.
• The MIL has two types
of
blinks, a long blink and short blink. The long
blinking lasts for 1.3 seconds, the short blinking lasts for 0.3 seconds.
One long blink is the equivalent to ten short blinks. For example, when
two long blinks are followed by nine short blinks, the MIL is 29 (two long
blinks=
29 blinks, plus nine short blinks).
• The MIL will start blinking when the ignition switch is ON and engine stop switch
"0"
or engine revs are below 2,000 rpm.
In
any
other conditions, the MIL will illuminate and stay on.
MIL CHECK
When the ignition switch is turned
ON
and engine stop switch
"0",
the MIL will stay
on
for a few seconds, then go off. If the MIL
does not come on
or
stays
on
when the ignition switch
is
turned ON, inspect the MIL circuit (page 4-47).
4-10
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