Controller capacitor voltage does not increase at startup.
* Ensure all fuses are properly seated and tight in the fuse holders.
* Ensure all wiring connections are tight and secure at the fuse
panel, key switch, and the battery disconnect switch.
* Check that the battery disconnect switch, the key switch, and the
main contactor contacts are in the correct position and properly
making contact.
* Ensure the towing connector near the dash display is not in
place.
* Remove fuse FU3 and turn the key switch to the ON position.
If the problem remains, perform Test A. If the problem does not
reappear, perform Tests B.
Test A:
Disconnect the battery and discharge the capacitors. See
Discharging Capacitors in the front of this section.
Disconnect the B+ cable from the traction controller.
Connect and ohm meter between the B+ and the B terminals
of the traction controller.
Check for an increasing resistance from 0 to 150 ohms over
10 seconds.
Disconnect the ohm meter and discharge the capacitors.
See Discharging Capacitors in the front of this section.
Connect the ohm meter negative lead to B and ohm meter
positive lead to UM. The ohm meter should read approximately
5K ohms.
Connect the ohm meter negative lead to B and the ohm
meter positive lead to US. The ohm meter should read approximately
5K ohms.
Connect the ohm meter negative lead to UM and the ohm
meter positive lead to B+. The ohm meter should read approximately
5K ohms.
Connect the ohm meter negative lead to US and the ohm
meter positive lead to B+. The ohm meter should read approximately
5K ohms.
If any of these tests is failed, replace the controller.
Tests B:
Check resistance between B+ and B at the steering motor.
The reading should be several thousand ohms.
Check for a failed R1 resistor in the steering circuit.
Install fuse (FU3), disconnect the dash connector, and turn
the key switch to the ON position. Measure the voltage
across B+ and B on the traction controller. If the value is
battery voltage, the dash display may be defective.
Check for brake driver continuous on. With the key switch
in the ON position and the seat switch in the open condition,
check that voltage between C28 and C29 in less than 2 volts.
Check for welded pump contactor tips.
* Wire #47 should be greater than 5 volts after the seat switch
opens for more than 10 seconds.
* Check the connections of wire #10-6 and wire #47.