SEAL KIT 7X2451 - Caterpillar

Illustration 1 g00726746
Component location (1) Control (2) Service tool connector (3) Diagnostic indicator (4) Harness code connector (5) Option code inputInformation is shown on diagnostic indicator (3) by flashing the indicator ON and OFF. The information that is flashed represents a two digit number. There is a series of flashes that represent the first digit. This is followed by a one second pause. The final step is a series of flashes that represents the digit in the second position. Count the number of flashes in order to determine each digit. A pause of about three seconds separates each two digit number.The ECM uses the diagnostic indicator in two different modes. The two modes are given below:
Normal Mode
Service ModeWhen power is applied, the ECM enters normal mode. Removing the machine identification plug from harness code connector 4 places the ECM in the service mode. Once in service mode, grounding different connector contacts of the harness code connector causes the ECM to flash diagnostic codes on the indicator. This diagnostic code is a two-digit number that corresponds to the normal Caterpillar service codes.Harness code connector 4 is located under the platform on the right side of the machine. The connector provides access to the service inputs. Connector contact 1 is grounded to flash diagnostic codes for active faults. Contact 5 is grounded to flash diagnostic codes for inactive faults. Contact 3 is used in order to clear the diagnostic codes for all inactive faults from the ECM. Connector contact 2 is ground.Normal Mode
When voltage is applied to the ECM and the machine identification plug is installed, the ECM flashes the machine code on the diagnostic code indicator. After flashing the machine code, the ECM enters normal mode and the diagnostic indicator is turned OFF. If a diagnostic code is detected, the diagnostic code indicator remains in the ON position.Normal Mode is used during normal machine operation. In normal mode, the ECM continuously checks for faults in the electronic control system. When a diagnostic code is detected, the diagnostic indicator is turned ON. See Service Mode. Service Mode
The ECM detects diagnostic codes that occur in switches, sensors, solenoids and the related harness circuits. A diagnostic code is detected when the signal at the control connector is outside a valid range. The ECM records the diagnostic code.If the diagnostic code indicator is ON and the diagnostic code indicator is in normal mode, diagnostic information is available in service mode. The service mode allows service personnel to see diagnostic codes that are detected by the ECM. The service mode allows service personnel to clear the diagnostic codes that are detected by the ECM.To enter service mode, disconnect the machine identification plug from the harness code connector. When in service mode, the diagnostics of the ECM are available to assist with the troubleshooting of diagnostic codes that are detected. The detected diagnostic codes are shown by flashing a diagnostic code on the diagnostic code indicator. This code is a two-digit representation of normal Caterpillar service