0-5
CIRCUIT
ACTYON 2006.03
2820-01
3) CIRCUIT DESCRIPTION
Glow plug is installed on the cylinder head (combustion chamber) in the D27DT preheating
control unit system.
Cold starting performance has improved and exhaust gas during cold starting has reduced.
PRE-HEATING
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POST-HEATING
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When the engine is started, post-heating starts by ECU controls. The idle rpm will be
increased to reduce toxic smoke, pollutants and noises.
Post-heating time is controlled by ECU.
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CHECKING GLOW PLUGS
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Check each glow plug for short in circuit
Check each glow plug for open in circuit due to overvoltage
Check glow plug for short to ground
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The power will be supplied to the glow plugs by ECU controls when the power is
supplied to the IG terminal from the battery and there are normal communications with
ECU within 2 seconds. The surface of glow plug will be heated up to 850°C very
quickly to aid combustion by vaporizing air-fuel mixture during compression stroke.
Preheating time is controlled by ECU.
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FORCEFUL RELAY SHUT-DOWN
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When glow plug is shorted to ground-
K-LINE COMMUNICATION
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ECU sends the results to preheating time control relay through K-Line to start
communication.
Preheating time control relay sends messages including self-diagnosis data for glow
plugs to ECU.
Glow plug makes communication only as response to demand.
When power is supplied, ECU starts self-diagnosis within 2 seconds.
Under the following conditions, communication error occurs.
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When there is no response from glow plug module within 2 seconds
When an error is detected in checksum
Less byte is received
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DTC
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