Perkins 1104D-E44T Fault Codes

The diagnostic lamp is the first indicator: when it activates, the engine ECM has a code to report. To read the code itself, Perkins directs you to the electronic service tools rather than to a blink-count procedure, connecting to the ECM to list the stored codes. Installations fitted only with warning lamps use the lamp table instead, and installations with an electronic display should be referred to the OEM for the display's own readout method.

Active codes represent problems that currently exist, and Perkins is explicit that these problems should be investigated first. Logged codes represent intermittent problems, recorded events and performance history; those problems may already have been repaired since the code was logged. In practice this means you clear the active list before chasing anything in the logged list, and you treat a logged code as evidence of a past event rather than as a component that needs replacing today.

Code 551 means no detected faults have occurred since the ignition keyswitch was turned to the ON position. It is the all-clear response, not a fault. No further action is required. If you are chasing an intermittent problem and get 551, the fault did not recur during this key cycle, so check the logged codes rather than assuming the machine is healthy.

They are the four injector faults, one per cylinder: 111 is a No. 1 Injector Fault, 112 is No. 2, 113 is No. 3 and 114 is No. 4. The documented remedy for all four is the same, to schedule a service. These are electrical faults in the injector circuit reported by the ECM, so the diagnosis is a wiring, connector and solenoid check on that cylinder's injector before the injector itself is condemned.

The 500-series codes describe the ECM's own supply and communications rather than the engine. 511 is an ECM Power Supply Voltage Fault, 514 is a SAE J1939 Data Link Fault, 516 is a 5 Volt Sensor DC Power Supply Fault, 517 is an 8 Volt Sensor DC Power Supply Fault, and 527 is a Customer/System Parameter Fault. Because 516 and 517 are the regulated rails that feed the engine's sensors, a fault on either can raise a scatter of unrelated-looking sensor codes at the same time. Fix the supply-rail code first and re-read the list before troubleshooting individual sensors.

No, and this is a common and expensive mistake. Several code numbers are shared between the two engines but carry different meanings. On the 1104D-E44T, 113 is a No. 3 Injector Fault while on the 1106D it is a Cylinder 2 Fault; 142 is a Secondary Engine Speed/Timing Sensor Fault versus a Pump Timing Sensor Fault; 144 is an Engine Operation Mode Selector Switch Fault versus a Crank Timing Sensor Fault; 162 is a Fuel Rail Pressure Valve Solenoid Fault versus a High Pressure Fuel Pump Fault; and 169 is Low Engine Coolant versus a Coolant Temperature Sensor Fault. Only 133, 143, 197, 516, 517 and 527 line up. Always read codes against the table for the exact engine on the plate.