ELECTRICAL SYSTEM TROUBLESHOOTING
Test Procedures
12
TEST PROCEDURES
Using the following procedures, the entire IQ Plus electrical system can be tested without major disassembly of the
vehicle.
See following WARNING.
WARNING
• If wires are removed or replaced, make sure wiring and wire harness is properly routed and secured.
Failure to properly route and secure wiring could result in vehicle malfunction, property damage,
personal injury, or death.
TESTING BASICS
• To use the CDT, the Run/Tow switch must be in the RUN position. The Run/Tow switch provides power to the logic
board and power board inside the controller.
• Battery Pack Voltage (BPV) will be referenced throughout the test procedures. BPV is accessed in
1 – Batteries / Voltage Check (BPV) on page 12-12
• The Run/Tow switch powers the key switch, controller, Forward/Reverse switch, 15-amp fuse, and reverse buzzer.
• The key switch powers the MCOR 2-pin circuit, pin 1 of the 24-pin connector, solenoid, and the 12-Volt power strip.
• The MCOR 3-pin circuit, motor speed sensor circuit, the communication point for the connected car device
(white/black wire in position 21 of the 24-pin connector), and charge indicator light is powered by the controller
(with Run/Tow switch in RUN).
• The 2-amp fuse is powered directly by the batteries via the solenoid and carries BPV to the connected car
device. No switch is involved.
• The term “back-probe” refers to probing the side of a connector that the wire enters. This is usually done when the
connector must remain connected to a device.
See following CAUTION.
CAUTION
• Be careful not to damage the wire or terminal when back-probing.
• When testing voltage, the batteries must remain connected.
• When testing voltage, unless specifically directed to do otherwise in a procedure, connect the black (–) probe of
the multimeter to the negative post of battery no. 8 (6 x 8-Volt battery set) or the B- terminal of the controller,
whichever is easier to access.
• When testing controller functions, the Run/Tow switch must be in the RUN position. The TOW position removes
power to the controller.
Index of Test Procedures
1 – Batteries / Voltage Check (BPV)
2 – 48-Volt Battery Pack Voltage Under Load
3 – Run/Tow Switch
4 – Fuses
5 – Circuit Breaker
6 – Wire Harness Diodes
7 – Key Switch and MCOR Limit Switch Circuit
8 – Forward/Reverse Rocker Switch
9 – Solenoid Activating Coil
10 – Solenoid Contacts
2019 Transporter Maintenance and Service Manual
Page 12-11
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