0333183 JOHNSON ORIFICE, No. 35

The alert indicators for the controller and/or the monitor are illuminated, when the engine/pump control detects a diagnostic code in the normal mode. The Real Time Error function of the "Data Mode" is used in order to show the detected diagnostic codes. The following troubleshooting procedures were written in order to help troubleshoot the system. However, the same procedures may be used to help determine the areas that may have caused an error to be logged.Note: When a diagnostic code for a sensor is present, the corresponding alert indicator on the monitor panel is activated. For example, if the coolant temperature sensor is shorted to +battery, then the following conditions will result:
The corresponding error code is stored in memory.
The gauge for the engine coolant temperature shows the region with the problem.
The action lamp will FLASH. Item 2 and item 3 are identical to the warning indications that are activated if the engine actually overheats. Troubleshooting Procedures
Controller self-diagnostic LED display
No power supply to controller
Communication problem between controller and monitor (A201, A202, A203).
Monitor is abnormal (3201).
Fuel gauge indication is abnormal (420A and 420B).
Engine coolant overheat indicator comes ON (1302).
Engine coolant temperature gauge indication is abnormal (4202).
Hydraulic oil temperature alarm indicator comes ON (1303).
Hydraulic oil temperature gauge indication is abnormal (4203).
Engine oil pressure alarm indicator comes ON (1301).
Engine oil pressure alarm indicator is abnormal.
Clogged air filter indicator comes ON (1304).
Clogged air filter indicator is abnormal.
Engine coolant level indicator is abnormal.
Hydraulic oil level indicator is abnormal.
Engine oil level indicator is abnormal.
Hydraulic oil filter indicator is abnormal.
Charge alert indicator comes ON while engine is running (4301).
Check of speed sensor (4201 and 4302).
Battery voltage is abnormal (not within 23 to 32 volts), (1405, 4101, 420C and 420D).
Engine speed dial does not work (engine speed does not change), (420E and 2303).
Low idle switch does not work.
AEC is abnormal.
Check of feedback signal from governor actuator (2201, 2202, 2301, and 2302).
Controllability is bad in boom priority mode (4105).
The stick moves slowly (4106).
The torque of the swing is weak in the swing priority mode (4105).
The travel alarm is abnormal (4108).
Automatic travel speed change (Low/High) is abnormal (4107, 4204 and 4207).
Swing is inoperable (410A).
1. Check over-current at proportional reducing valve (4103).
2. Check open circuit at proportional reducing valve (4103).
3. Check short circuit of proportional reducing valve to battery voltage.
Calibration data error (2304).
Engine stalls (4303).Example Of Troubleshooting
Illustration 1 g00663017
Example Of A Checking Procedure For The Electronic Control System (1) Preparations. (2) Problem description. (3) Error code character display (Ch. D.) (4) Check item. (5) Probable causes and solutions.Note: The character display on the monitor panel will indicate an error code on the character display (3). The charts that follow should be used in order to troubleshoot the problems that are indicated by the error code on the character display (3) .A check of a connector will provide information about the connectors that should be checked before troubleshooting. Check the specified connectors for improper connections. A loose contact between two connectors can be caused by water in the connectors.Check the connectors before troubleshooting.Preparations (1) provide information on the preliminary arrangements that must be made before troubleshooting. The problem description (2) will indicate the problems that are shown by the character display on the monitor panel.The error code that is shown will indicate specific codes for real time errors and error log. The service program that is selected will determine the pattern of the character display.The section for "check items" (4) will list items that must be checked by using a multimeter.
The "check items" (4) information, "0 Ohms" means that "continuity is present" and "infinite" means that "there is no continuity".
Connector check : (other than "[/em/]"): 0 OhmsNote: (Other than "[/em/]" means all of the terminals or all the pins of the connector, except the one that is specified in "[ ]".The following information is an exampl