PUMP DOLLY 4C5749 - Caterpillar

The multi-function lamp will flash a two or a three-digit code in a given sequence to show the flash code diagnostic massage. By counting the number of flashes in a given sequence, you can determine the flash code.After the flash code as finished, the flash code sequence will continual to be repeated. If a second flash code has been activated, then the system will repeat both codes in the given sequence.Four short flashes will indicate a flash code of 04. Three long flashes of one second each followed by one short flash will indicate a flash code of 31.
APS ____________________Actuator Power Supply
CPU ____________________Central Processing Unit (Engine controller)
MAP ____________________Manifold Air Pressure
Table 1
Diagnostic Flash Codes
Flash Code Diagnostic Description Latched to Next Key Cycle Engine Shut-down
04 Actuator Out Put Overcurrent - -
13 Oil Pressure Switch Issue Yes Yes
15 MPU Sensor Failure - Yes
17 Battery Voltage Over High Threshold - -
18 Battery Voltage Below Low Threshold - -
22 Air Pressure Sensor Out of Range - -
31 Engine Oil Pressure Low - Yes
32 Actuator Mechanically Stuck - Yes
33 Actuator Position Sensor Out of Range - Yes
40 Actuator Output Overcurrent - Yes
51 Internal Hardware Failure - Yes
52 Device Configuration Corrupted - Yes
53 Controller Internal Supply Dropout - -
54 (EEPROM) Read/Write Internal Hardware Failure - -
55 APS J1-J2 Pin Short to Ground - Yes
543 (Overspeed) engine speed Limit Exceeded - Yes For more information contact your Cat dealer.