925082 Volvo.Penta O-ring

Table 1
J1939 Code and Description CDL Code and Description Comments
7602–2
Aftertreatment #1 DEF Controller #1 Identification : Erratic, Intermittent, or Incorrect 5028–2
Aftertreatment #1 DEF Controller #1 Identification : Erratic, Intermittent, or Incorrect The Aftertreatment #1 Diesel Exhaust Fluid Control Unit (DCU) #1 has detected a resistance outside the normal resistance of the DCU resistor.
7602–3
Aftertreatment #1 DEF Controller #1 Identification : Voltage Above Normal 5028–3
Aftertreatment #1 DEF Controller #1 Identification : Voltage Above Normal The Aftertreatment #1 DCU #1 has detected an open circuit in the DCU resistor circuit.
7602–4
Aftertreatment #1 DEF Controller #1 Identification : Voltage Below Normal 5028–4
Aftertreatment #1 DEF Controller #1 Identification : Voltage Below Normal The Aftertreatment #1 DCU #1 has detected a short circuit in the DCU resistor circuit.
7603–2
Aftertreatment #1 DEF Controller #2 Identification : Erratic, Intermittent, or Incorrect 5029–2
Aftertreatment #1 DEF Controller #2 Identification : Erratic, Intermittent, or Incorrect The Aftertreatment #1 DCU #2 has detected a resistance outside the normal resistance of the DCU resistor.
7603–3
Aftertreatment #1 DEF Controller #2 Identification : Voltage Above Normal 5029–3
Aftertreatment #1 DEF Controller #2 Identification : Voltage Above Normal The Aftertreatment #1 DCU #2 has detected an open circuit in the DCU resistor circuit.
7603–4
Aftertreatment #1 DEF Controller #2 Identification : Voltage Below Normal 5029–4
Aftertreatment #1 DEF Controller #2 Identification : Voltage Below Normal The Aftertreatment #1 DCU #2 has detected a short circuit in the DCU resistor circuit.
7604–2
Aftertreatment #2 DEF Controller #1 Identification : Erratic, Intermittent, or Incorrect 5030–2
Aftertreatment #2 DEF Controller #1 Identification : Erratic, Intermittent, or Incorrect The Aftertreatment #2 DCU #1 has detected a resistance outside the normal resistance of the DCU resistor.
7604–3
Aftertreatment #2 DEF Controller #1 Identification : Voltage Above Normal 5030–3
Aftertreatment #2 DEF Controller #1 Identification : Voltage Above Normal The Aftertreatment #2 DCU #1 has detected an open circuit in the DCU resistor circuit.
7604–4
Aftertreatment #2 DEF Controller #1 Identification : Voltage Below Normal 5030–4
Aftertreatment #2 DEF Controller #1 Identification : Voltage Below Normal The Aftertreatment #2 DCU #1 has detected a short circuit in the DCU resistor circuit.
7605–2
Aftertreatment #2 DEF Controller #2 Identification : Erratic, Intermittent, or Incorrect 5031–2
Aftertreatment #2 DEF Controller #2 Identification : Erratic, Intermittent, or Incorrect The Aftertreatment #2 DCU # 2 has detected a resistance outside the normal resistance of the DCU resistor.
7605–3
Aftertreatment #2 DEF Controller #2 Identification : Voltage Above Normal 5031–3
Aftertreatment #2 DEF Controller #2 Identification : Voltage Above Normal The Aftertreatment #2 DCU #2 has detected an open circuit in the DCU resistor circuit.
7605–4
Aftertreatment #2 DEF Controller #2 Identification : Voltage Below Normal 5031–4
Aftertreatment #2 DEF Controller #2 Identification : Voltage Below Normal The Aftertreatment #2 DCU #2 has detected a short circuit in the DCU resistor circuit. Probable Causes
Codes
DCU resistor
Wiring
TestsRecommended Actions
Table 2
Troubleshooting Test Step Value Result
1. Check for Codes
A. Establish communication between Cat® Electronic Technician (ET) and the Electronic Control Module (ECM). Refer to Troubleshooting, Electronic Service Tools if necessary.
B. Turn the keyswitch to ON.
C. Look for an active or logged code.
Codes
Result: No codes are present.
Proceed to Test Step 7.
Result: There are codes present.
Proceed to Test Step 2.
2. Check the Resistance of the DCU Resistor
A. Turn the keyswitch to OFF.
B. Disconnect the 86-pin connector from the DCU that is logging the code.
C. Measure the resistance between pin-38 and pin-39 on the DCU that is logging the code.
- For Aftertreatment #1 DCU #1 the resistance should be 178Ω 10Ω
- For Aftertreatment #2 DCU #2 the resistance should be 604Ω 10Ω
- For Aftertreatment #2 DCU #1 the resistance should be 1540Ω 10Ω
- For Aftertreatment #2 DCU #2 the resistance should be 5230Ω 10Ω
Note: The 398-5063 Probe must be used to prevent damage to the DCU connector.
DCU Resistor
Result: The resistance measurement of the DCU resistor at