The glow plugs are used to heat the inlet air and able to start the engine. This heating is necessary to allow the diesel fuel to ignite when the temperature low. The ECM controls the feed to preheating resistor via one relay. When the ignition switch is turned on, applies the battery voltage from the heater fuse to the ECM. The glow plug relay coil is energized to turn on the relay switch, which activates the glow plugs by the ECM, according to the signal of water temperature sensor. Feed faults are diagnosed by the ECM via the lines connected to the control terminal of the heater relay. The duration of preheating and illumination of glow indicator lamp are entirely controlled by the injection computer depending on the engine operating conditions. In case of the glow plug relay failure, the engine symptoms will occur the glow plugs deactivation and the engine starting delayed during the cold condition.
If the glow relay circuit is short to ground or open circuit during two driving cycles, this code will be set.
DTC NO.
Detecting Condition
Possible Cause
P 1326
P 1327
? P 1326
Short circuit to battery line
? P 1327
Open circuit :
? Short circuit to ground
? Wire broken
? Too high temperature in power stage
? Engine Condition : IG ON
? Fuel Limit : NO
? Fuel Cut : NO
? EGR OFF : NO
? MIL : NO
? Open or short in circuit
? Relay
? ECM