The CHECK ENGINE indicator is controlled by the powertrain control module (PCM) through CKT 419. The PCM illuminates the CHECK ENGINE indicator in order to warn the driver that an engine control malfunction has been detected. An engine control malfunction may affect the engine performance and the emissions. For more information, refer to Engine Controls.

The PCM illuminates the CHECK ENGINE indicator for approximately 3 seconds during the engine start-up for a bulb inspection.

The TEMP indicator is controlled by the powertrain control module (PCM) through CKT 35 (DK GRN). The PCM illuminates the TEMP indicator in order to warn the driver that an engine overbearing condition has been detected. Whenever the PCM senses that the engine coolant temperature (ECT) sensor has closed, indicating an overheating condition, the PCM grounds CKT 35 (DK GRN), illuminating the indicator. The PCM illuminates the TEMP indicator for approximately 3 seconds during the engine start-up for a bulb inspection.

The OIL PRESSURE indicator is controlled by the oil pressure switch through CKT 31. The OIL PRESSURE indicator illuminates in order to warn the driver that a low engine oil pressure condition has been detected. Whenever the oil pressure falls below 28 kPa (4 psi), the oil pressure switch closes and the OIL PRESSURE indicator illuminates. The oil pressure switch is open when the oil pressure is above 28 kPa (4 psi). When the engine is initially cranked, the oil pressure is below 28 kPa (4 psi), thus the oil pressure switch closes and the indicator illuminates for the bulb inspection. When the engine starts, the oil pressure is above 28 kPa (4 psi). Thus, the oil pressure switch opens and the OIL PRESSURE indicator deactivates.

The CHECK OIL LEVEL indicator is controlled by the Powertrain Control Module (PCM) through CKT 1173 (BRN/WHT). The PCM illuminates theCHECK OIL LEVEL indicator to warn the driver that the engine oil level is low. For more information refer to Engine Oil Level Sensor/Switch Diagnosis in Engine Controls.