Table of Contents
Advertisement
ELECTRICAL SYSTEM TROUBLESHOOTING: IQ
PLUS ELECTRIC VEHICLES
MCOR Voltage Test with the CDT Handset
1.
Place chocks at the front wheels and lift the rear of the vehicle with a chain hoist or floor jack. Position jack stands
under the frame crossmember between the spring mount and side stringer, just forward of each rear wheel. See
WARNING "Lift only one end..." in General Warnings on page 1-1. See also following WARNING.
WARNING
• The key switch should be placed in the OFF position and left in the OFF position for the duration
of this test.
2.
Connect the CDT to the vehicle. See Plugging the CDT into the Vehicle on page 11-2.
3.
Access the Monitor menu and select THROTTLE % by using the SCROLL DISPLAY buttons.
4.
The CDT should indicate 0% with the pedal not pressed. While monitoring the CDT display screen, slowly press
the accelerator pedal. As the pedal is pressed, the CDT should indicate a steady, incremental rise from 0% (pedal
not pressed) to 100% (pedal fully pressed). See following NOTE.
NOTE: Observe closely to see if throttle input percentage randomly or sporadically fluctuates with pedal at rest,
during pedal travel and with pedal fully pressed. If it fluctuates or does not rise to 100%, check the drive bar
for wear. If drive bar is not worn, replace MCOR.
5.
If the MCOR passes the previous test, press and hold the accelerator pedal to the floor. By hand, gently move the
pedal from side to side and see if the throttle input percentage fluctuates from 100%. If it fluctuates, check the
drive bar for wear. If drive bar is not worn, replace MCOR.
6.
If throttle input percentage never reaches 100% in the previous steps, check the drive bar for wear. If drive
bar is not worn, replace MCOR.
MCOR Voltage Test without the CDT Handset
1.
Place chocks at the front wheels and lift the rear of the vehicle with a chain hoist or floor jack. Position jack
stands under the frame rails just forward of each spring mount. See WARNING "Lift only one end..." in
General Warnings. See also following WARNING.
WARNING
• The key switch should be placed in the OFF position and left in the OFF position for the duration
of this test.
2.
With the batteries connected, place Run/Tow switch in RUN. Using a multimeter set to 200 volts DC, place
red (+) probe on battery no. 1 positive post and place black (–) probe (with insulation-piercing probe) on the
purple/white wire at a point close to the three-pin connector at the MCOR. The reading should be approximately
48 to 50 volts (full battery voltage).
3.
If reading is zero volts, check the purple/white wire continuity from the three-pin connector at the MCOR to the
16-pin connector at the speed controller. Check terminal positions in three-pin connector at the MCOR and the
16-pin connector. If all of the continuity readings are correct and the connectors are wired correctly, replace the
speed controller.
4.
With multimeter set to 20 volts DC, place the black (–) probe on battery no. 6 (6 x 8 volt battery set) negative post
and the red (+) probe (with insulation-piercing probe) on the white wire at a point close to the three-pin connector
at the MCOR. The reading should be approximately 4.65 volts.
5.
If reading is zero volts, check the white wire continuity from the three-pin connector at the MCOR to the 16-pin
connector at the speed controller. Check terminal positions in three-pin connector at the MCOR and the 16-pin
connector. If all of the continuity readings are correct and the connectors are wired correctly, replace the
speed controller.
6.
With multimeter set to 20 volts DC, place the black (–) probe on battery no. 6 (6 x 8 volt battery set) negative post
and the red (+) probe (with insulation-piercing probe) on the yellow wire at a point close to three-pin connector
2019 Carryall 500 and 700 Maintenance and Service Manual
12
Test Procedures
Page 12-25
Advertisement
Table of Contents
Troubleshooting
