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Symptom:
P0560-SYSTEM VOLTAGE TOO HIGH
When Monitored and Set Condition:
P0560-SYSTEM VOLTAGE TOO HIGH
When Monitored: With the engine running.
Set Condition: The ECM detects battery voltage is above 15.5 volts.
GROUND CIRCUIT HIGH RESISTANCE
BATTERY SUPPLY OR ASD RELAY OUTPUT CIRCUIT HIGH RESISTANCE
GENERATOR FIELD CONTROL CIRCUIT SHORTED TO GROUND
GENERATOR INTERNALLY SHORTED TO GROUND
ENGINE CONTROL MODULE
TEST
1
NOTE: If DTC P1511 or P1512 is present with this DTC, diagnose DTCs P1511
and P1512 before diagnosing this DTC.
NOTE: The battery must be fully charged and the generator belt must be in
good condition and tensioned properly before continuing.
Turn the ignition off.
Disconnect the ECM harness connectors.
Using a 12-volt test light connected to 12-volts, check all of the ECM Ground circuits
including the Battery(-) Sense circuit.
Does the test light illuminate brightly for each circuit?
Yes → Go To 2
→ Repair the Ground circuit(s) for high resistance.
No
2
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check all of the ECM Battery Supply
and ASD Relay Output circuits including the Battery(+) Sense circuit.
Does the test light illuminate brightly for each circuit?
Yes → Go To 3
→ Repair the Battery Supply or ASD Relay Output circuit(s) for high
No
POSSIBLE CAUSES
ACTION
Perform CHARGING VERIFICATION - VER-3.
resistance.
Perform CHARGING VERIFICATION - VER-3.
DRIVEABILITY - DIESEL
117
APPLICABILITY
All
All
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