COVER GP-ACCESS 3904851 - Caterpillar

CAN Errors
Table 1
Diagnostic Codes
Code Description Conditions Notes
523548-2 CAN Data Link : Erratic, Intermittent, or Incorrect Battery voltage is normal
Key switch turn OFF to ON
No Start switch signal
No error of "CAN2 Bus off" CAN frame error open circuit or short circuit
523619-2 No Communication with Engine ECM Battery voltage is continuous more than 4 seconds
IG switch signal (ECM: V13 V33, DCU: 18 terminal) is continuously activated more than 2 seconds Open circuit of harness (Engine-ECM)
SCR system can no operate as DCU cannot receive the CAN data from Engine ECM (engine speed, load, etc.)
523620-2 ECU-ACU CAN Communication Error Battery voltage is normal
Starter Switch signal (ECM V12 terminal) is not activated Output limitation: Approx 50% of normal condition
Speed limitation (Accelerator limitation: 10 %)
EGR stops
Intake throttle 100 % opens
523625-2 ECU-ACU CAN Communication Error Battery voltage is normal
Starter switch signal (ECM: V12 terminal) is not activated. Output limitation Approximately 50 % of normal condition
Speed limitation (Accelerator limitation: 10 %)
523591-2 CAN CCVS (Parking Switch ad Vehicle Speed) frame error Battery voltage is normal.
No Start switch signal. CAN Frame time error.
Engine ECU assumes that parking switch is Off and Vehicle Speed is 0.
523592-2 CAN CM1 (Regen SW) frame error CAN Frame time error.
Regeneration is Inhibited.
Parked Regeneration is Inhibited.
523593-2 CAN DDC1 (Transmission) Frame Error CAN Frame time error.
523594-2 CAN ETC2 (Neutral Switch) Error CAN Frame time error.
523595-2 CAN ETC5 (Neutral Switch) Frame Error CAN Frame time error.
523596-2 CAN TSC1 Frame Error CAN Frame time error.
523597-2 CAN EBC1 Frame Error CAN Frame time error.
Engine derated
523604-2 CAN1 Bus Off Key switch is ON.
Battery voltage is normal. CAN1 Bus +B or Ground Open Circuit or high traffic error for 2 seconds or more.
EGR Stop
Engine derated
Warning Level 3
523598–2 CAN EBC1 Frame Error Battery voltage is normal
No Start signal CAN Frame time error
Engine derated Note: When the machine ECM is flashed, any of the codes will be active. The code is logged after the key switch is cycled. To clear the codes, turn the key switch to the ON position.If the codes are active, they are indicating a harness issue.Code 523604-2 is indicating a harness issue in the wires for CAN communication between the engine ECM “Pins 16 and 36 on machine connector side” and to either the service tool or to the NRS Valve. Check the harness and the connectors in this circuit.The remaining codes are indicating a harness issue in the CAN communication between the engine ECM and the machine ECM “Pin 17 and 37 on machine connector side”. Check the harness and the connectors in this circuit.