Inspect the preheating system when engine does not start at cold starting. If there is problem in the preheating system, engine hard starting occurs at cold starting or initial engine hesitation occurs after starting and exhaust fumes are discharged.
GCU (Glow plug Control Unit) is installed on the upper side of timing cover in the S-engine. Glow plug control current is optimized by GCU. And also GCU retrieves DTC after diagnosing each glow plug corresponding to engine condition.
IG S/W 'OFF', ENGINE 'OFF'
Connect a scantool to Data Link Connector (DLC).
Check DTC related to preheating system.
☞ P0670 Glow relay circuit malfunction
Symptom | Inspection procedure | |
Case1 | ● If DTC 'P0670 Glow relay circuit malfunction" is displayed. | ● Main power or ground problem in the glow relay circuit, ☞ Refer to DTC guide. |
