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TROUBLE SHOOTING
Pedal Voltage Tests
The pedal voltages have to be within a certain tolerance for the cruise to operate.
Testing J4 pins will require a volt meter for accurate voltages, a test light will not work.
Key on only, with pedal harness fully connected, measure the following pins on J4 (see page 10).
Color at J4
Green
Blue
Yellow
Light Blue
Handle Voltage Tests [J3]
LED status light
Green
Amber
Red
Problem
Throttle goes into "limp mode"
Cruise not engaging
Cruise disengages when using
turn signals
Cruise surges
Cruise runs away
Pedal at Rest
1 Volt
1 Volt
0.5 Volt
0.5 Volt
+12 VOLTS – supplies power to handle with key on.
CRUISE ON – will have power when the cruise handle is turned on.
SET/COAST – will have power when the Set/Coast button is pressed.
ACCEL/RESUME – will have power when the Accel/Resume button is pressed.
On - Ready to operate
On - Operating normally
On - CRC is seeing a fault
Possible cause
- Intermittent power
- Poor ground
- Began after ECU was tuned
- Incorrect pedal voltage operation
- No power on J2 Red or Blue
- No ground on J2 Black
- No ground on J2 White/Brown
- Incorrect handle harness used
- Incorrect pedal voltage operation
- Turn signals feeding back into brake
circuit
- Throttle too sensitive
- Wrong VSS pulse rate
Pedal Wide Open
Tolerance
4 Volts
+/- 0.3 volts
4 Volts
+/- 0.3 volts
2 Volts
+/- 0.3 volts
2 Volts
+/- 0.3 volts
Off or short blink - loss of power or ground
Short flash – Switch functions, but cannot engage
- Properly connect red lead of J2 to proper power
- Use different ground – connect black wire of J2 to
throttle pedal ground, pin A (purple)
- Restore to previous tune and troubleshoot tuning
adjustments
- Refer to pin voltages on page 10 and voltage test
above for correct pedal
- Verify power and grounds at J2
- Connect black wire of J2 to throttle pedal ground,
from the ECU side. (Purple is commonly used as
ground)
- Verify grounding of White/Brown to conventional
brake lights
- Use a relay if using LED tail lights or if the brake
bulb sockets are rusty
- Our turn signal handles use harness 394207,
HND-2 and GM stock four wire handles use 394206
(pages 8 and 9)
- Refer to pin voltages on page 11 and voltage test
above for correct pedal
- Add relay on page 7 to isolate feedback voltage
- HP Tuner can make the throttle less sensitive
- Verify the supply pulse rate is configured for 4,000
PPM
[12]
Solution
MAN #650553:A
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