The ECM provides ground to one side of the coil of the main relay and the other side is connected to the battery. The ECM monitors battery voltage and the voltage after the main relay.
The ECM measures the voltage from ignition key and from main relay respectively and compares two voltages. This comparison will watch if the Main Relay has switched and remains on after ignition Key-On and if it has switched off after the ignition Key-Off. The ECM sets DTC P0560 if the voltage after Main Relay is lower than a predetermined threshold after ignition key-on or higher than a predetermined threshold after ignition key-off.
ITEM | DETECTING CONDITION | POSSIBLE CAUSE |
DTC Strategy | ● Comparison of battery voltage and voltage after | ● Open or short circuit ● Contact resistance in connectors |
Enable Conditions | ● Battery voltage 〉10V | |
Threshold Value | ● Voltage after main relay when ON < 6V or voltage after main relay when OFF 〉6V. | |
Diagnostic Time | ● 0.1 sec. |
