[12]
MAN #650541:A
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
Pedal at Rest
Pedal Wide Open
Tolerance
Green
1 Volt
4 Volts
+/- 0.3 volts
Blue
1 Volt
4 Volts
+/- 0.3 volts
Yellow
0.5 Volt
2 Volts
+/- 0.3 volts
Light Blue
0.5 Volt
2 Volts
+/- 0.3 volts
Handle Voltage Tests [J3]
LED status light
Green
On - Ready to operate
Off or short blink - loss of power or ground
Amber
On - Operating normally
Short flash
– Switch functions, but cannot engage
Red
On - No CAN bus detected
Problem
Possible cause
Solution
Throttle goes into “limp mode”
- Intermittent power
- Poor ground
- Began after ECU was tuned
- Incorrect pedal voltage operation
- 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
Cruise not engaging
- 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
- 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
Cruise disengages when using
turn signals
- Turn signals feeding back into brake
circuit
- Add relay on page 7 to isolate feedback voltage
Cruise surges
- Throttle too sensitive
- HP Tuner can make the throttle less sensitive
Cruise runs away
- ECU is seeing wrong speed signal
- Verify that the ECU tune matches the type of
transmission speed pulse 17 vs. 40 pulses
+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.
