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ELECTRICAL SYSTEM AND TESTING
Troubleshooting
2008-2011 IQ Plus Electric Vehicle Maintenance and Service Supplement
Page 11-23
11
TEST PROCEDURE 7 – CIRCUIT BREAKER
See General Warning, Section 10, Page 10-1.
1. Place the key switch on the OFF position, the Tow/Run switch in the TOW position, and the Forward/
Reverse switch in the NEUTRAL position.
2. Set a multimeter on 200 volts DC. With the batteries connected, connect the negative (–) lead to battery
no. 8 negative post. With an insulation-piercing probe, connect the positive (+) lead to the tan wire on the
back of the circuit breaker.
3. The reading should be 48 volts. If the reading is 0 volts, replace the circuit breaker.
TEST PROCEDURE 8 – BATTERY PACK VOLTAGE (UNDER LOAD)
See General Warning, Section 10, Page 10-1.
1. Before proceeding with this test procedure, the batteries must be connected and fully charged. Connect
the positive (+) lead of a 36 to 48-volt battery discharge machine (CC P/N 101831901), to battery no. 1
positive post and connect the negative (–) lead to battery no. 8 negative post. Record the voltage reading
from discharge machine.
2. Turn the discharge machine on and record the voltage reading of battery pack while under load.
3. A fully charged set of batteries in good condition should read between 47-49 volts while under load.
4. A reading of 32-46 volts indicates discharged or failed batteries. Each battery should be checked with a
multimeter while under load.
5. A reading of 32 volts or less will not activate discharge machine. If the voltage of the batteries is below
32 volts, the batteries are deeply discharged or have failed.
6. Recording the battery pack voltage reading while under load provides a more accurate diagnosis of the
condition of the batteries. When the discharge machine is ON, it places the battery pack under load and
many times can help determine if one or more batteries in the set have failed. Testing battery voltage
while the batteries are not under load will not always indicate the true condition of the batteries. For more
information about the batteries, refer to
TEST PROCEDURE 9 – KEY SWITCH AND MCOR LIMIT SWITCH CIRCUIT
See General Warning, Section 10, Page 10-1.
Key Switch and MCOR Limit Switch Circuit Test with the IQDM 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 Warning, Section 10, Page 10-1.
2. Turn the key switch to the OFF position and place the Forward/Reverse switch in the NEUTRAL position.
3. Connect the IQDM to the vehicle.
4. Test the key switch.
4.1. Access the Monitor menu, and select KEY INPUT by using the SCROLL DISPLAY buttons. The
IQDM should indicate OFF when the key switch is in the OFF position.
4.2. While monitoring the IQDM display screen, turn the key switch to the ON position. The IQDM
should indicate ON.
4.3. If the IQDM does not indicate that KEY INPUT is ON when the key switch is in the ON position, pro-
ceed to the following procedure, Key Switch and MCOR Limit Switch Circuit Test without the IQDM
Handset. If the key switch functions as described, proceed to the following step.
See following
NOTE.