Section 12 - Iq System Troubleshooting - Mcor; General Information - Club Car 2009-20011 Electric Precedent Maintenance And Service Manual

SECTION 12 – IQ SYSTEM TROUBLESHOOTING – MCOR
DANGER
• See General Warnings on page 1-1.
WARNING
• See General Warnings on page 1-1.
• Shorting of battery terminals can cause personal injury or death.
– Do not place component mounting plate directly on top of batteries when removing or installing
plate.
– Remove plate from vehicle completely.

GENERAL INFORMATION

NOTE: Many 2009 model year Precedent vehicles have had the pedal group reworked to use an MCOR in place
of the throttle position sensor. Use this troubleshooting section for system diagnosis. For a vehicle that still
uses the throttle position sensor, see Excel System Troubleshooting – TPS on page 13-1 or IQ System
Troubleshooting – TPS on page 11-1.
Starting early 2010 model year with Serial Number PQ1009-082079, all electric Precedent vehicles were
factory-equipped with an MCOR sensor in the Gen II pedal group. The pedal group has its own serial number
with a prefix that also changed as follows:
Gen II pedal group equipped with throttle position sensor (before
reverting to MCOR):
Gen II pedal group equipped with MCOR:
The IQ System vehicle uses a 48-volt electrical system that is powered by four 12-volt lead-acid batteries or six 8-volt
lead-acid batteries and includes an onboard computer. The IQ System vehicle uses a shunt-wound 3.2 hp motor
and includes several additional features.
• Shunt-Wound Motor: The shunt-wound motor, unlike a series motor, is designed so that the speed controller is
able to vary the amount of current passing through the field coils independently from the current passing through
the armature.
• Motor Braking: Under certain conditions a shunt-wound motor also has the ability to act as an electrical brake to
slow the vehicle. There are three features of the IQ electrical system which will activate the motor braking function:
Walk Away Braking, Pedal Down Motor Braking, and Pedal Up Motor Braking (adjustable with the IQDM-P handset).
• Walk Away Braking: This prevents the vehicle from rolling away uncontrolled should the driver park on a slope and
leave the vehicle without locking the park brake. The vehicle will roll at about 1 mph (1.6 km/h). If the walk away
braking function remains engaged for two seconds or more, a warning buzzer will sound to alert the driver that
motor braking has been activated.
WARNING
• Walk Away Braking will not limit vehicle speed to 1 mph (1.6 km/h) on very steep grades. Do not
operate vehicle on slopes exceeding 20% grades.
either PGE1 or PBE1(with brake light switch)
either PGE2 or PBE2(with brake light switch)
2009-2011 Electric Precedent Maintenance and Service Manual
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