ELECTRICAL SYSTEM AND TESTING
Troubleshooting
Page 11-36
2008-2011 IQ Plus Electric Vehicle Maintenance and Service Supplement
11
Test Procedure 10J – Pin 23
1. Place the Tow/Run switch in the RUN position, the Forward/Reverse swith in the NEUTRAL position, and
the key switch in the OFF position.
2. Set the multimeter for 200 volts DC. With an alligator clip, connect the red (+) probe of the multimeter to
the positive terminal of battery # 1. With an insulation-piercing probe, connect the black (–) probe to the
green/white wire at Pin 23.
3. Push the car to activate walk away braking. When braking activates and reverse buzzer sounds, the
reading should be 48 volts.
4. If the reading is zero volts, check the continuity of the green/white wire. if the continuity is good, replace
the speed controller.
TEST PROCEDURE 11 – ONBOARD COMPUTER SILICON-CONTROLLED
RECTIFIER (SCR) CIRCUIT
See General Warning, Section 10, Page 10-1.
The silicon controlled rectifier (SCR), located inside the onboard computer, acts as a switch on the negative
side of the circuit.
This allows the onboard computer (OBC) to control the battery charging current.
Use the following procedure to test the SCR:
1. With batteries connected and a multimeter set to 200 volts DC, place the red (+) probe on the positive
post of battery no. 1 and place the black (–) probe on the charger receptacle fuse terminal that has the
black 10-gauge OBC wire attached to it. The reading should be approximately 36-42 volts.
2. If the reading is zero volts, check the black 10-gauge wire connections at the controller and receptacle.
Check the continuity of the black 10-gauge wires. If the wires and connections are okay, the SCR has
failed. Replace the OBC. If the reading is correct, proceed to the following step.
3. Plug in AC and DC cords. When the battery charger relay clicks on, reading should be approximately 48
volts (full battery voltage). If the reading does not rise from approximately 40 volts to full battery voltage
when the DC cord is plugged in and the relay clicks on, check the following items:
•
Charger receptacle fuse and black wire terminal socket in the charger receptacle.
•
Onboard computer gray wire and fuse.
See Test Procedure 12 – Onboard Computer Gray Wire and
•
Red wire at the charger receptacle.
See Test Procedure 13 – Voltage at Charger Receptacle Red
Figure 11-24 Test 11: OBC Silicon-Controlled Rectifier
Circuit
1
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