Hyundai Santa Fe: Engine Control System / Description and operation
If the Gasoline Engine Control system components (sensors, ECM, injector, etc.)
fail, interruption to the fuel supply or failure to supply the proper amount
of fuel for various engine operating conditions will result. The following situations
may be encountered.
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1. |
Engine is hard to start or does not start at all.
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If any of the above conditions are noted, first perform a routine diagnosis
that includes basic engine checks (ignition system malfunction, incorrect engine
adjustment, etc.). Then, inspect the Gasoline Engine Control system components
with the diagnostic tool.
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Before removing or installing any part, read the diagnostic
trouble codes and then disconnect the battery negative (-) terminal.
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Before disconnecting the cable from battery terminal, turn the
ignition switch to OFF. Removal or connection of the battery
cable during engine operation or while the ignition switch is
ON could cause damage to the ECM.
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The control harnesses between the ECM and heated oxygen sensor
are shielded with the shielded ground wires to the body in order
to prevent the influence of ignition noises and radio interference.
When the shielded wire is faulty, the control harness must be
replaced.
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When checking the generator for the charging state, do not disconnect
the battery '+' terminal to prevent the ECM from damage due
to the voltage.
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When charging the battery with the external charger, disconnect
the vehicle side battery terminals to prevent damage to the
ECM.
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Malfunction Indicator Lamp (MIL)
A malfunction indicator lamp illuminates to notify the driver that there is
a problem with the vehicle. However, the MIL will go off automatically after
3 subsequent sequential driving cycles without the same malfunction. Immediately
after the ignition switch is turned on (ON position - do not start), the MIL
will illuminate continuously to indicate that the MIL operates normally.
Faults with the following items will illuminate the MIL.
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Mass Air Flow Sensor (MAFS)
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Intake Air Temperature Sensor (IATS)
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Engine Coolant Temperature Sensor (ECTS)
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Throttle Position Sensor (TPS)
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Upstream Oxygen Sensor Heater
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Downstream Oxygen Sensor
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Downstream Oxygen Sensor Heater
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Crankshaft Position Sensor (CKPS)
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Camshaft Position Sensor (CMPS)
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Evaporative Emission Control System
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Vehicle Speed Sensor (VSS)
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Idle Speed Control Actuator (ISCA)
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Refer to "Inspection Chart For Diagnostic Trouble Codes (DTC)"
for more information.
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A malfunction indicator lamp illuminates to notify the driver that there is
a problem with the vehicle. However, the MIL will go off automatically after
3 subsequent sequential driving cycles without the same malfunction. Immediately
after the ignition switch is turned on (ON position - do not start), the MIL
will illuminate continuously to indicate that the MIL operates normally.
Faults with the following items will illuminate the MIL
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Heated oxygen sensor (HO2S)
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Mass Air Flow sensor (MAFS)
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Throttle position sensor (TPS)
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Engine coolant temperature sensor (ECTS)
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Idle speed control actuator (ISCA)
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Refer to "Inspection Chart For Diagnostic Trouble Codes (DTC)"
for more information.
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1. |
After turning ON the ignition key, ensure that the light illuminates
for about 5 seconds and then goes out.
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2. |
If the light does not illuminate, check for an open circuit in the harness,
a blown fuse or a blown bulb.
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Self-Diagnosis
The ECM monitors the input/output signals (some signals at all times and the
others under specified conditions). When the ECM detects an irregularity, it
records the diagnostic trouble code, and outputs the signal to the Data Link
connector. The diagnosis results can be read with the MIL or the diagnostic
tool. Diagnostic Trouble Codes (DTC) will remain in the ECM as long as battery
power is maintained. The diagnostic trouble codes will, however, be erased when
the battery terminal or ECM connector is disconnected, or by the diagnostic
tool.
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If a sensor connector is disconnected with the ignition switch
turned on, the diagnostic trouble code (DTC) is recorded. In
this case, disconnect the battery negative terminal (-) for
15 seconds or more, and the diagnosis memory will be erased.
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The Relation Between DTC and Driving Pattern in EOBD System
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1. |
When the same malfunction is detected and maintained during two sequential
driving cycles, the MIL will automatically illuminate.
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2. |
The MIL will go off automatically if no fault is detected after 3 sequential
driving cycles.
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A Diagnostic Trouble Code (DTC) is recorded in ECM memory when a malfunction
is detected after two sequential driving cycles. The MIL will illuminate
when the malfunction is detected on the second driving cycle.
If a misfire is detected, a DTC will be recorded, and the MIL will illuminate,
immediately after a fault is first detected.
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A Diagnostic Trouble Code (DTC) will automatically erase from ECM memory
if the same malfunction is not detected for 40 driving cycles.
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A "warm-up cycle" means sufficient vehicle operation
such that the coolant temperature has risen by at least
40 degrees Fahrenheit from engine starting and reaches
a minimum temperature of 160 degress Fahrenheit.
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A "driving cycle" consists of engine startup, vehicle
operation beyond the beginning of closed loop operation.
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Components Location
1. ECM (Engine
Control Module)
2. Manifold Absolute Pressure Sensor (MAPS)
3. Intake Air Temperature Sensor (IATS)
4...
Other information:
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Failure Inspection
Diagnosis with diagnostic tool
1.
In the body electrical system, failure can be quickly diagnosed by using
the vehicle diagnostic system (diagnostic tool).
The diagnostic system (diagnostic tool) provides the following information...
Components and components location