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Diesel engine air compressor fault code 679

DD15 SPN 679/FMI 7 Troubleshooting

The fault condition is typically related to a Pressure Limiting Valve (PLV) staying open. The pressure limiting valve will open when rail pressure is above 1150 bar.

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The following are descriptions of Compressor and Engine diagnostic codes. When a Compressor diagnostic code is displayed the "Compressor Malfunction" diagnostic light will be illuminated.

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SPN 1172

An open return can cause multiple fault codes to be active. Before troubleshooting Fault Code 691, check for multiple fault codes. An extension harness between the main engine

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Understanding compressor fault codes —

When a compressor breaks down, it rarely does so without warning. Modern air compressors come equipped with fault codes designed to relay critical information about the

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Explanation: The SECU has detected an open S2, compressor separator tank temperature Switch. Machine could be overheated or have a faulty switch or wiring. S2 is located in the

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The turbocharger compressor inlet air temperature sensor shares return wires in the engine harness with other sensors. An open return can cause multiple fault codes to be

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Engine power and compressor air output will be reduced at high altitude or hot ambient temperatures. Machine review and maintenance check schedules should be more frequent

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OPERATION & SERVICE MANUAL

The complete operating unit consists of a diesel engine for power, compressor assembly, air/oil separator system, cooling system for the engine and compressor oil, instrumentation,

Diesel engine air compressor fault code 679 [PDF]

6 FAQs about [Diesel engine air compressor fault code 679]

What is a compressor fault code?

Following, are the descriptions of the COMPRESSOR fault codes. These are indicated by the SECU Display Digit. S3 is located in the discharge pipe from the airend. The SECU has detected an open S2, compressor separator tank temperature Switch. Machine could be overheated or have a faulty switch or wiring.

What does a code 641/9 mean on a diesel engine?

If warning lamps illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800. This code typically means a turbo actuator internal error code, problem unknown. Check for multiple codes. [a] If 641/9, 641/11, 641/14 or 2795/9 are present, service those faults first.

What does a fault code mean on a pressure limiting valve?

When a fault code is generated for a Pressure Limiting Valve (PLV), it typically indicates that the valve is staying open. The pressure limiting valve opens when rail pressure exceeds 1150 bar. The MCM commands a lower rail pressure to try and close the pressure limiting valve. If the valve does not close, a fault code is generated.

What does a fault code mean on a diesel engine?

If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800. This fault code indicates that there is a short to power. Turn the ignition OFF. Disconnect the fan control solenoid connector. Turn the ignition ON (key On, engine OFF). Measure the voltage between pin 1 of the fan control solenoid connector and ground.

What should I do if 679/7 is not working?

If only the 679/7 fault code is present in DDDL, go to the next step. Using DDDL, monitor rail pressure at idle. If rail pressure is above 900 bar, check for a damaged needle return line and a damaged line (fuel rail to injector). Repair as necessary.

How do I troubleshoot a diesel engine fault code 168/1?

If warning lamps illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800. This diagnosis is typically an open circuit, short to ground or short to power. Check for multiple codes. [a] If fault code 168/1 is active in addition to 3662/5, service 168/1 first. Refer to section

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