3-5: Operating Instructions
3 SPEED THROTTLE CONTROL FUNCTION
▬ For GM Vans ▬
The GM Throttle Controller must meet certain “Chassis Ready” conditions to elevate the
engine rpm, which are as follows:
1. Parking Brake is set
2. Gear shift is in “Park”
3. Foot is o Service Brake (brake pedal)
4. Foot is o Accelerator Pedal
5. Vehicle is stationary (no speed)
6. Engine is started and idling
7. The A/C / Heater switch is in o position
The Throttle Controller must be initialized anytime the Data Link Cable (DLC)
harness is disconnected from the Data Link Connector. To initialize the system
switch ignition key to OFF position, plug in DLC harness, switch the ignition on,
and then start the engine. This allows the Throttle Controller to read the PCM
engine computer.
On the Throttle Controller, there are LED lights with corresponding labels to provide status
and problem detection information (refer to Figure 3-1 and Table 3-1).
Figure 3-1. Location of Controller’s LED Lights
with Labels and RPM Trim Potentiometers
3 TRIM POTS
LED LIGHTS WITH
LABELS
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