Table 4. Basic Checks
Basic Checks
Probable Causes and Test Procedures
1. Perform the following checks with power OFF and capacitor discharged. See Discharging the Capacitors.
a. Check battery:
• Check battery voltage to have measured voltage indicated on data plate.
• Check specific gravity, water level, and voltage of each cell to be fully charged according to
battery specification sheet.
• Cables are properly crimped and seated in the connector housing.
• Contact surface of lugs are clean.
b. Check battery connector:
• Cables properly crimped and seated in the connector housing.
• Contact surface of lugs are clean.
c. Check control fuses FU1, FU2, FU3, FU4, and FU5:
• Good condition.
• Properly seated in fuse holder.
• Have proper contacts with fuse holder.
2. Perform the following check with the power ON.
• The voltage across the key switch should be approximately 0 volts from TF08 to TF11.
• The voltage from each side of the key switch (TF08 or TF11) to B- (NEG STUD) should be approxi-
mately equal to the battery voltage.
Table 5. CANbus Test
CANbus Test
Probable Causes and Test Procedures
NOTE: Battery must be disconnected and capacitor must be discharged, see Discharging the Capacitors, be-
fore performing the following static tests:
1. Check resistance between CAN LO and CAN HI wires on PC connector. Should be approximately 60
ohms.
2. Check continuity of CAN HI circuits and CAN LO circuits following the CAN HI and CAN LO connections
table in step 3:
a. Ensure that there is continuity along all nodes listed under CAN HI column which are connected to
CAN HI circuit 901.
b. Ensure that there is continuity along all nodes listed under CAN LO column which are connected to
CAN LO circuit 900.
3. While doing so, also check for properly seated and not deformed pin connections in each connector.
Follow CAN connections table below:
Device CAN HI (Circuit 901) CAN LO (Circuit 900)
Standard Device CAN Ports:
Service CAN Port CPS28, Pin A CPS28, Pin B
2200 YRM 1415 Troubleshooting
15
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