PIN 3G3005 - Caterpillar

Table 1
J1939 Code and Description CDL Code and Description Comments
5966-5
Aftertreatment #1 DEF Control Module Power Supply : Current Below Normal 3965-5
Aftertreatment #1 Diesel Exhaust Fluid Control Module Power Supply #1 : Current Below Normal An open circuit has been detected on the keyswitch circuit between the A5:E2 aftertreatment controller and the DCU.
5966-6
Aftertreatment #1 DEF Control Module Power Supply : Current Below Normal 3965-6
Aftertreatment #1 Diesel Exhaust Fluid Control Module Power Supply #1 : Current Above Normal A short circuit has been detected on the keyswitch circuit between the A5:E2 aftertreatment controller and the DCU.
6309–5
Aftertreatment #1 DEF Control Module #1 Power Supply #2 : Current Below Normal 3966–5
Aftertreatment #1 Diesel Exhaust Fluid Control Module Power Supply #2 : Current Below Normal An open circuit has been detected on the keyswitch circuit between the SCR System and the DCU.
6309-6
Aftertreatment #1 DEF Control 3966-6
Aftertreatment #1 Diesel Exhaust Fluid Control Module Power Supply #2 : Current Above Normal Pin 29 of the A5:E2 aftertreatment controller has a short circuit to battery positive or negative. Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Determine the Code
A. Establish communication between Cat® ET and the Electronic Control Module (ECM). Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Download the "Warranty Report" from the Aftertreatment ECM before performing any troubleshooting or clearing any diagnostic trouble codes.
C. Determine the diagnostic trouble code that is active.
Diagnostic Trouble Code
Result: A 3965-5 or 5966-5 code is active.
Proceed to Test Step 2.
Result: A 3965-6 or 5966-6 code is active.
Proceed to Test Step 3.
Result: A 3966-6 or 6309-6 code is active.
Proceed to Test Step 4.
2. Check the Wiring for an Open Circuit
A. Turn the keyswitch to the OFF position for 2 minutes. The keyswitch must be off for two minutes to allow the DEF pump to purge, to reset the code, and to reset the DCU.
B. Disconnect