DTC P0562 L61
Circuit Description
The PCM monitors ignition voltage on circuit 839 at all times with reference
to circuit 451 (ground) when the engine is running. Ignition voltage from circuit 439
can be read on the Scan tool as IGNITION 1 voltage. DTC P0562 sets when
the PCM detects low system voltage. DTC P0563 sets when the PCM detects high
system voltage. These values are out of the normal charging system voltage range.
Conditions for Setting the DTC
| • | DTC P0562 will set if ignition voltage is less than 10 volts
when: |
| • | Condition exists for longer than 4 minutes |
| • | Engine speed is greater than 1300 RPM |
| • | Voltage of 10 volts occurs twice in the ignition cycle |
| • | DTC P0563 will set if ignition voltage is greater than 17 volts
when: |
| • | Condition exists for longer than 4 minutes |
| • | Voltage of 17 volts occurs twice in the ignition cycle |
| • | DTC P0562 and P0563 diagnostics run continuously with engine running. |
| • | P0562 and P0563 are (type D) DTCs |
Diagnostic Aids
If DTC P0621 is set, diagnose that DTC first. A circuit fault in the
generator L-terminal circuit will cause the generator not to charge and may set DTC P0562.
To locate an intermittent problem, use the scan tool to monitor IGNITION 1
voltage with engine running. With all accessories On or all accessories Off. Changing
voltage should be in the range of 12.5-15.5 volts.
With engine Off, compare IGNITION 1 voltage on the scan tool with actual
battery voltage with a DVOM. If readings do not fall within +/-0.2 volts, check
circuit 839 and 451 for corrosion and tightness.
Perform a charging system test. Refer to "Starting and Charging Section" in
this service manual.
DTC P0562, P0563
