Detroit DD15 GHG14 (2014-16) Fault Code: SPN 3597 FMI 4 (ACM) High Side Digital Output 1 Circuit Failed Low

DESCRIPTION:
High side digital output 1 circuit short to ground.

MONITORED PARAMETER:
High side digital output 1 circuit.

TYPICAL ENABLING CONDITIONS:
Always on

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
Two second

DASH LAMPS:
1. MIL
2. CEL

ENGINE REACTION:
Derate 25%

VERIFICATION:
Ignition key cycle.

PROBABLE CAUSES:
For 2007 EPA Engines:
1. Engine brake solenoid.
2. Short to ground between pin 91 of the ECM 120-pin connector and the valve cover fuel injector harness connector (31-pin connector).
3. Short to ground between pin 22 of the 31-pin connector on the vehicle side of he harness and hte fan control solenoid.
4. Short to ground between pin 93 of the ECM 120-pin connector and the air seal pressure regulator valve cover.
5. Failed air seal pressure regulator valve.

For 2010 EPA Engines:
1. Inspect the connectors on: DEF pump, pressure limiting unit, diffuser heater, and DEF injection valve.
2. ACM2 (Aftertreatment Control Module) Failure.
3. Short to ground between pins 1, 3, or 5 of the ACM2 and pin 2 of the corresponding components.
4. Reconnect components from line #1 one at a time and clear the code after each connection. When the code goes active, this is is your failed part.

For 2014 EPA Engines:
1. Engine jake brake solenoid failure.
2. Front under valve cover fuel injector harness.
3. Short to ground between pin 91 of the 120-pin ECM connection and the valve cover fuel injector harness connector (31-pin).
4. Short to ground between pin 22 of the 31-pin connector on the vehicle side of the harness and fan control solenoid.
5. Short to ground between pin 93 of the 120-pin ECM connection and the air seal pressure regulator valve connector.
6. Air seal pressure regulator valve.