Glow plug, electrical heat wire, improves cold starting and reduce white smoke after cold starting by heating intake air into the combustion chamber ECM shows that the status of power supply for Glow plug is good or not through the glow lamp.
DTC P0381 is set that ECM detects over current or no current on the glow lamp control circuit for more than 1sec during glow lamp ON condition. This DTC is retrieved if it is short to battery / ground in glow lamp control circuit.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Voltage monitoring
? Open in glow lamp
? Glow lamp control circuit
Enable Conditions
? IG key ON (Monitoring activates under the lamp ON condition)
Threshold Value
? Short to battery in circuit.
? Short to ground in circuit.
? Open in circuit.
Diagnostic Time
? 1.0 sec.
Fail Safe
Fuel cut
NO
EGR Off
Fuel Limit
Check Lamp
OFF
Coolant Temp.
Operating time
- 25 ?
4 sec.
- 15 ?
3 sec.
0 ?
0.5 sec.
20 ?
0 sec.