P0560
DTC P0560 System Voltage
COMPONENT LOCATION
GENERAL DESCRIPTION
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.
DTC DESCRIPTION
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.
DTC Detecting Condition:
Schematic Diagram:
MONITOR DTC STATUS
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Press F4(DTAL) to select DTC information from the DTCs menu.
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Read "DTC Status" parameter.
5. Is parameter displayed "History (Not Present) fault"?
- History (Not Present) fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.
YES: Fault is intermittent caused by poor contact in the sensor's and/or ECM'S connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for loose or poor connections, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Go to next step as below.
COMPONENT INSPECTION
1. Ignition "OFF".
2. Remove the main relay.
3. Apply 12 V and a ground to 2 and 4 terminals of the main relay
4. Check if the main relay works well when it is energized. (If the main relay works normally, a clicking sound can be heard).
5. Does the main relay operate normally?
YES: Go to next step as below.
NO: Replace as necessary and go to "Verification of Vehicle Repair" procedure.
TERMINAL AND CONNECTOR INSPECTION
1. 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.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage
3. Has a problem been found?
YES: Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Go to "Power Supply Circuit Inspection" procedure.
POWER SUPPLY CIRCUIT INSPECTION
1. Remove the main relay.
2. Ignition "ON" & Engine "OFF".
3. Measure the voltage between terminal 2 of the main relay harness connector and chassis ground.
4. Measure the voltage between terminal 5 of the main relay harness connector and chassis ground.
Specification: Approx. B+
5. Is voltage within the specification?
YES: Go to "Control Circuit Inspection".
NO: Check for an open or short to ground in the power circuit. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
CONTROL CIRCUIT INSPECTION
1. Check for short to ground in control circuit.
1. Ignition "OFF".
2. Disconnect Relay harness connector.
3. Measure resistance between terminal 4 of the relay harness connector and chassis ground
Specification: Infinite
4. Is resistance within the specification?
YES: Go to next step as below.
NO: Repair as necessary and go to "Verification of Vehicle Repair" procedure.
2. Check for short to power in control circuit.
1. Ignition "OFF".
2. Disconnect relay and ECM connectors.
3. Ignition "ON" and Engine "OFF".
4. Measure voltage between terminal 4 of the relay harness connector and chassis ground
Specification: Approx 0 V
5. Is voltage within the specification?
YES: Go to next step as below.
NO: Repair as necessary and go to "Verification of Vehicle Repair" procedure.
3. Check for open in control harness.
1. Ignition "OFF".
2. Disconnect relay and ECM connectors.
3. Measure resistance between terminals 4 of the relay harness connector and 23 of the ECM harness connector
Specification: Approx. 0 Ohms
4. Is resistance within the specification?
YES: 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.
NO: Repair as necessary and go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. 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.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History (Not Present) fault"?
YES: System performing to specification at this time. Clear the DTC.
NO: Go to the applicable troubleshooting procedure.