Heating combustion chamber, glow plug increases fuel ignitibility and makes fuel in the foggy state easily when engine is cold. Thus, glow plug makes engine starting easily and decreases exhaust gas produced just after turning engine on when engine is cold.
Glow plug control unit(GCU) controls operation of glow plug by PWM with ECTS signal, battery voltage and IG KEY ON signal.
Through glow lamp in cluster, ECM let drivers know if glow plug is ON.
DTC P0383 is set when GCU circuit is short to ground or faulty of GCU
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Voltage monitoring |
•
Glow plug / control unit circuit error
•
Faulty GCU | ||
Enable Conditions |
•
IG key ON | |||
Threshold value |
•
Short to ground | |||
Diagnosis Time |
•
1 sec. | |||
Fail Safe | Fuel cut | NO |
•
- | |
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | OFF | |||
Voltage | Operation time |
12V | approx. 36 sec (at 20℃) |
Fig 1) Glow plug is controlled to duty 28% when IG key turns to ON from OFF and cold engine.
Fig 2) Glow plug control signal waveform when IG key turns to ON from OFF and warmed engine.
