Perkins 1104 Series Workshop Manual Troubleshooting

The 1104 models RF, RH, RK and 1106 model VK engines were designed for electronic control. The engines include an Electronic Control Module (ECM), a fuel injection pump that is electronically controlled, and a collection of engine sensors. The ECM controls the engine operating parameters through the software within the ECM and the inputs from the various sensors. The software contains parameters that control the engine operation. The parameters include all of the operating maps and customer selected parameters.

Perkins 1104 Service Manual
Electronic Service Tools are designed to help the service technician with the diagnosis and repair of electronic engines. Several tools are available to assist the service technician. Some of the included Diagnostic Functional Tests in this manual require two short jumper wires. The jumper wires are used to check the continuity of some wiring harness circuits by shorting two adjacent terminals together in a connector. A long extension wire may also be needed to check the continuity of some wiring harness circuits.

The electronic system consists of the Electronic Control Module (ECM), the engine sensors, and the Machine Interface Connector (MIC). The ECM is the computer. The personality module is the software for the computer. The personality module contains the operating maps. The operating maps define the following characteristics of the engine:

  1. Horsepower
  2. Torque curves
  3. Engine speed (rpm)

Engine Governor
The electronic controls determine the injection timing and the amount of fuel that is delivered to the cylinders. These decisions are based on the actual conditions and the desired conditions at any given time.

The governor compares the desired engine speed to the actual engine speed. The actual engine speed is determined through the crankshaft position sensor. If the desired engine speed is greater than the actual engine speed, the governor injects more fuel in order to increase engine speed.

Timing Considerations
Once the governor has determined the amount of fuel that is required, the governor must determine the timing of the fuel injection. Fuel injection timing is determined by the ECM after considering input from the following components:

  • Engine coolant temperature sensor
  • The sensor for the intake manifold air temperature
  • The sensor for the intake manifold pressure

Diagnostic Codes
When the ECM detects an engine problem, the ECM generates a diagnostic code. Also, the ECM logs the diagnostic code in order to indicate the time of the problem’s occurrence. The ECM also logs the number of occurrences of the problem. There are two types of diagnostic fault codes. There are fault codes and event codes.

Diagnostic Fault Codes
Diagnostic fault codes are provided in order to indicate that an electrical problem or an electronic problem has been detected by the ECM. In some cases, the engine performance can be affected when the condition that is causing the code exists. More frequently, the operator cannot detect any difference in the engine performance.

Perkins 1104 Series Troubleshooting

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