0390708 JOHNSON BY-PASS COVER ASSY.

Illustration 1 g01100964
Output voltage from a typical analog temperature sensor
Illustration 1 indicates the signal range for a typical analog sensor. Diagnostic codes will be generated if the sensor's output signal is below 0.2 VDC or above 4.8 VDC.Active Diagnostic Codes
An active diagnostic code represents a problem with the electronic control system. Correct the problem as soon as possible.When an active diagnostic code is generated, the "Active Alarm" indicator ("Engine Control Alarm Status" on Cat ET) is activated in order to alert the operator. If the condition that generated the code is momentary, the message disappears from the list of active diagnostic codes. The diagnostic code becomes logged.When an active diagnostic code is generated, a display module such as the Vital Information Management System (VIMS) may produce a warning.Logged Diagnostic Codes
When the Electronic Control Module (ECM) generates a diagnostic code, the ECM logs the code in permanent memory. The ECM has an internal diagnostic clock. Each ECM will record the following information when a code is generated:
The hour of the first occurrence of the code
The hour of the last occurrence of the code
The number of occurrences of the codeThis information is a valuable indicator for troubleshooting intermittent problems.A code is cleared from memory when one of the following conditions occur:
The service technician manually clears the code.
The code does not recur for 100 hours.
A new code is logged and there are already ten codes in memory. In this case, the oldest code is cleared.Some diagnostic codes may be easily triggered. Some diagnostic codes may log occurrences that did not result in complaints. The most likely cause of an intermittent problem is a faulty connection or damaged wiring. The next likely cause is a component failure. The least likely cause is the failure of an electronic module. Diagnostic codes that are logged repeatedly may indicate a problem that needs special investigation.Note: Always clear logged diagnostic codes after investigating and correcting the problem which generated the code.Diagnostic Codes Table
Table 1
3500B System Diagnostic Codes
CID FMI Description
0001 05 Injector Cylinder 1 open circuit
0001 06 Injector Cylinder 1 short
0002 05 Injector Cylinder 2 open circuit
0002 06 Injector Cylinder 2 short
0003 05 Injector Cylinder 3 open circuit
0003 06 Injector Cylinder 3 short
0004 05 Injector Cylinder 4 open circuit
0004 06 Injector Cylinder 4 short
0005 05 Injector Cylinder 5 open circuit
0005 06 Injector Cylinder 5 short
0006 05 Injector Cylinder 6 open circuit
0006 06 Injector Cylinder 6 short
0007 05 Injector Cylinder 7 open circuit
0007 06 Injector Cylinder 7 short
0008 05 Injector Cylinder 8 open circuit
0008 06 Injector Cylinder 8 short
0009 05 Injector Cylinder 9 open circuit
0009 06 Injector Cylinder 9 short
0010 05 Injector Cylinder 10 open circuit
0010 06 Injector Cylinder 10 short
0011 05 Injector Cylinder 11 open circuit
0011 06 Injector Cylinder 11 short
0012 05 Injector Cylinder 12 open circuit
0012 06 Injector Cylinder 12 short
0013 05 Injector Cylinder 13 open circuit
0013 06 Injector Cylinder 13 short
0014 05 Injector Cylinder 14 open circuit
0014 06 Injector Cylinder 14 short
0015 05 Injector Cylinder 15 open circuit
0015 06 Injector Cylinder 15 short
0016 05 Injector Cylinder 16 open circuit
0016 06 Injector Cylinder 16 short
0091 08 Throttle Position signal abnormal
0094 03 Filtered Fuel Pressure
0094 04 Filtered Fuel Pressure
0100 03 Filtered Oil Pressure