3176 OEM SYSTEMS Caterpillar

1.0 Diagnostic Codes

Usage:

Active Diagnostic Codes

Diagnostic codes are used by the 3176 system to warn the vehicle operator of a problem and indicate to the service technician the nature of the problem. Some codes are used only to record an event, and do not indicate problems.

An ACTIVE Diagnostic code represents a problem that should be investigated and corrected AS SOON AS POSSIBLE. Repairing the cause of an ACTIVE code will cause the code to be cleared from the ACTIVE Diagnostic Code screen.

When an ACTIVE code is generated, the 3176 Diagnostic Lamp will turn ON and remain ON, blinking every five seconds. If the condition generating the fault occurs only for a brief moment, the lamp will go OFF after five seconds and the fault will be LOGGED.

NOTE: After a problem has been investigated, the related diagnostic code should be cleared from memory.

ACTIVE codes may be viewed using either of the electronic service tools (ECAP or DDT), and may also be viewed using the diagnostic lamp and cruise control switches. The Diagnostic Lamp should not be confused with the Warning Lamp which is used with 3176 Caterpillar Engine Protection.

Using The Cruise Control Switches To Display Active Codes:

A. Turn key ON (engine does not need to be started to view codes).

B. The 3176 Diagnostic Lamp will turn ON for five seconds, blink OFF, turn ON again for five seconds, then OFF for five seconds. At the end of that time, the lamp will begin to flash the first number of the two-digit code (count the flashes). After two seconds OFF, then it will flash the second digit. If two or more codes are present, they will follow the first after a few seconds and be displayed in the same manner.

C. Active Diagnostic codes may be displayed at any time by using cruise control switches. With key ON or engine running, turn the cruise control ON/OFF switch to OFF, and move the SET/RESUME switch to RESUME position. Once the codes begin to flash the switch may be released. The 3176 Diagnostic Lamp will flash out all the codes that are currently ACTIVE, or intermittent codes that have occurred since the key was turned ON.

* Some codes represent "events", not failures. These codes are 71-00 Idle Shutdown Override (01), 71-01 Idle Shutdown Occurrence (47), 84-00 Vehicle Overspeed Warning (41), and 190-00 Engine Overspeed Warning (35). The following Engine Protection Codes are events and faults: 100-01 Low Oil Pressure Warning (46), 100-11 Very Low Oil Pressure (46), 110-00 High Coolant Temperature Warning (61), 110-11 Very High Coolant Temperature (61), 111-01 Low Coolant Level Warning (62), 111-11 Very Coolant Level (62). Passwords are required to clear these faults from the log. An example of a "Logged Event" is below.

* Some of the components which are a part of the 3176 Electronic Control System have diagnostic codes designed to detect problems in their circuits, others do not. The following components do not have associated diagnostic codes for circuit faults:

Cruise/PTO ON/OFF SwitchSET/RESUME SwitchDiagnostic LampWarning LampClutch SwitchBrake SwitchEngine or Dash Data LinkEngine Retarder Relays or SwitchesEngine Retarder

* The next page contains a listing of diagnostic codes for the 3176 Electronic Control System. The "Flash Code" represents the code that will be flashed out on the Diagnostic Lamp when Active. The "PID-FMI" is the SAE J1587 representation of the code- this numerical code can only be viewed by an ECAP or DDT, and is new for 7LG7500-UP engines. The "PID-FMI" is more specific: it specifies for example, a sensor open circuit condition vs. a sensor short circuit condition. The "Flash Code" will only specify a sensor fault- it will not specify a short circuit or open circuit condition. This is the reason the diagnostic code listing that follows has multiple entries for some "Flash Codes". For example, Flash Code 38 could be either an Inlet Air Temperature Sensor Open Circuit or Short Circuit. Viewing the "PID-FMI" on an ECAP or DDT would reveal the specific nature of the Inlet Air Temperature Sensor Fault: PID-FMI 172-03 represents an Inlet Air Temperature Sensor Open Circuit, and 172-04 represents an Inlet Air Temperature Sensor Short Circuit condition.

* Note that Flash Code 57, Parking Brake Switch Fault does not have a corresponding PID-FMI code. The diagnostic is no longer available. Flash Code 55, No Detected Faults, also does not have a PID-FMI code assigned.