3.
Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to "Power Supply Circuit Inspection" procedure.
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 ● Ignition ON | |
Threshold Value | ● Voltage after main relay when ON < 6V | |
Diagnostic Time | ● 0.1 sec. |
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to "Power Supply Circuit Inspection" procedure.
Remove the main relay.
Ignition "ON" & Engine "OFF".
Measure the voltage between terminal 2 of the main relay harness connector(E07) and chassis ground.
Measure the voltage between terminal 5 of the main relay harness connector(E07) and chassis ground.
Specification : Approx. B+
Is voltage within the specification?
▶ Go to "Control Circuit Inspection"
▶ Check for an open or short to ground in the power supply circuit. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to ground in control circuit.
Ignition "OFF".
Disconnect Relay harness connector.
Measure resistance between terminal 4 of the relay harness connector and chassis ground.
Specification : Infinite
Is resistance within the specification?
▶ Go to next step as below.
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to power in control circuit.
Ignition "OFF".
Disconnect relay and ECM connectors.
Ignition "ON" and Engine "OFF".
Measure voltage between terminal 4 of the relay harness connector and chassis ground.
Specification : Approx 0V
Is voltage within the specification?
▶ Go to next step as below
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for open in control harness.
Ignition "OFF".
Disconnect relay and ECM connectors.
Measure resistance between terminals 4 of the relay harness connector and 23 of the ECM harness connector.
Specification : Approx 0Ω
Is resistance within the specification?
▶ Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Ignition "OFF".
Remove the main relay.
Apply 12V and a ground to 2 and 4 terminals of the main relay.
Check if the main relay works well when it is energized. (If the main relay works normally, a clicking sound can be heard.)
Does the main relay operate normally?
▶ Go to next step as below.
▶ Replace as necessary and go to "Verification of Vehicle Repair" procedure.
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
Read "DTC Status" parameter.
Is parameter displayed "History(Not Present) fault"?
▶ System performing to specification at this time. Clear the DTC
▶ Go to the applicable troubleshooting procedure.
