IQ SYSTEM TROUBLESHOOTING
Test Procedures
11
CAUTION
• Do not fully insert probes into the 16-pin plug. Doing so can result in a poor connection.
5.
Place the Tow/Run switch in the TOW position and connect the battery cables, positive (+) cable first. Tighten
battery terminals to 110 in-lb (12.4 N·m).
6.
With the Tow/Run switch in the TOW position, the multimeter should indicate zero volts.
7.
Place the Tow/Run switch in the RUN position.
2m
20
m
200
m
2k
200
200
200
200
20
2
200
m
500
20k
200k
2000
k
1000
OFF
WAVETEK
5XL
V
V
V
A
!
!
COM
200nA
MAX
1000 ---
750V
FUSED
200 DCV Setting (reading with Tow/Run switch in RUN position)
690
Figure 11-14
Pin 9 Test
8.
With the Tow/Run switch in the RUN position, the multimeter should indicate full battery voltage (approximately 48
volts).
9.
If any other reading is obtained, check the following items:
– Continuity of the wires in the wire harness
– Tow/Run switch for proper operation.
See Test Procedure 6 – Tow/Run Switch on page 11-17.
TEST PROCEDURE 16 – Pin 10
See General Warnings on page 1-1.
Pin 10 in the 16-pin connector provides a connection point for the key switch to the speed controller. The key switch
provides a +48 volt signal to the speed controller through pin 10 when the key switch is in the ON position.
1.
Disconnect the battery cables and discharge the controller as instructed.
See WARNINGS “To avoid
unintentionally starting...” and “After disconnecting the batteries, wait 90 seconds...” in General
Warnings on page 1-1.
2.
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 on page 1-1.
3.
Disconnect the 16-pin connector at the speed controller.
4.
Using a multimeter set for 200 volts DC, insert the red (+) probe of the multimeter into pin 10 (tan wire) of the
16-pin connector.
See following CAUTION.
Using an alligator clip, connect the black (–) probe to the B– terminal
of the speed controller
(Figure 11-15, Page 11-28)
.
2009 Electric Precedent Maintenance and Service Manual
Page 11-27
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