Book: 23227143 (8-24-2010) Rev CPage63
COMPRESSOR CODE 71
The CAN network has two terminating resistors TR1 and TR2. The resistance
value of each terminator is 120 ohms. The terminators are connected together in
parallel across the High (+) and Low (-) WJDes in the cable. When connected the
resistance value between the High (+) and Low (-) WJDes is 60 ohms.
Component Location:
P1 connector is connected to the WEDGE controller and the J02 connector is
connected to the engine ECM. Terminating resistor TR1 is located on the main
harness near the WEDGE controller. Terminating resistor TR2 is located on the
main harness near the engine ECM.
Troubleshooting Steps
Action Result
Step 1:
Check fuse F2.
Replace fuses as needed
Step 2:
Verify battery + and – connections to the engine
ECM.
Repair harness as needed
Step 3:
Turn ignition switch to the “ON” position. Using a
multimeter, measure the keyswitch signal voltage at
J02-B2.
Voltage measure should be 24
VDC at J02-B2.
If not, check all harness
connections in the keyswitch
signal circuit from WEDGE to
engine ECM.
Step 4:
Disconnect P1 connector from the WEDGE, J02
connector from the engine ECM, and any other
devices connected to the J1939 CAN BUSS. Using a
multimeter, measure the resistance between P1-34
and P1-35.
Using a multimeter, measure the resistance between
J02-A1 and J02-B1.
Resistance value measured
should be 60 ohms across P1-
34 and P1-35
Resistance value measured
should be 60 ohms across
J02-A1 and J02-B1
If not, measure resistance
value of each terminator (120
ohms) and or check for
defective splice, broken
WJDe, and loose connection
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