P0562

Diagnostic Chart:

Schematic:

The PCM monitors ignition voltage on circuit 439 at all times with reference to circuit 551 (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. These values are out of the normal charging system voltage range.

DTC PARAMETERS
DTC P0562 will set if ignition voltage is less than 11 volts when:
^ Condition exists for longer than 1 second
^ Engine is running
^ Voltage of 11 volts occurs twice in the ignition cycle.

DTC P0562 diagnostics run continuously with engine running.

DTC P0562 are type D DTCs.

DIAGNOSTIC AIDS

IMPORTANT: DTC P1635 will NOT set if a short to B+ on the 5 volt reference circuit occurs (PCM service part #21024985 or 21024986).

If DTC P1635 is set, diagnose that DTC first. A short to ground on one of the 5 volt reference circuits (EGR position sensor, fuel tank pressure sensor, MAP sensor or TP sensor) may set DTC P0562. A short to B+ on one of the 5 volt reference circuits may set DTC P0561.

If DTC P0621 is set, diagnose that DTC first. A generator L-terminal low voltage circuit fault will cause the generator not to charge.

An open or intermittent open in generator L-terminal circuit 25 will cause the generator not to charge. DTC P0562 will set when battery voltage falls below the calibrated voltage.

Jump starting another vehicle with a dead battery may cause large voltage fluctuations and may set P0562.

To locate an intermittent problem, use Scan tool to monitor IGNITION 1 voltage with engine running. With all accessories On or all accessories Off, voltage should be in the range of 11-17 volts.

With engine Off, compare IGNITION 1 voltage on Scan tool with actual battery voltage with a DVOM. If readings do not fall within ±0.2 volts, check circuit 439 and 551 for corrosion and tightness.

Perform a charging system test. (Refer to Starting and Charging.) Testing and Inspection