Post Installation System Operation Test
Perform the following tests before mounting the module, to allow viewing of the diagnostic LED’s, if needed.
1. Place transmission in Park and start the engine. Note: Vehicle may enter Fast Idle if Battery Voltage
(VBAT) is low. Either wait to see if the battery charges and Fast Idle stops, or place a charger on the
vehicle to disable the VBAT low trigger to allow testing of other triggers.
2. If the Parking Brake Fast Idle trigger is enabled, apply the Parking Brake. The engine speed will increase to
the set RPM level. Release the Parking Brake. Verify the system comes out of Fast Idle
. One at a time, manually engage all three Fast Idle Inputs by having aftermarket vehicle equipment ground
the Input wires. Engine speed will increase to the set RPM level.
4. If this does not occur, check harness connections. Also, see diagnostics below.
5. While Fast Idle engaged, keep the Input wire grounded, and depress the Service Brake for 1 second.
Fast idle will temporarily disengage anytime the Service Brake is depressed, but will automatically
reengage after approximately 2 seconds once the Brake pedal is released.
6. Place transmission shift lever in the “Neutral” position. (Input wire still grounded). The system must not
activate Fast Idle.
The AFIS420VSX-B is properly installed only if it passes all of the above steps.
Module Mounting
Ensure all harnesses are properly connected and routed, and are not hanging below the dash area. Mount the
AFIS420VSX-B module using screws or double sided tape and reinstall all removed panels
LED # Diagnostic Mode LED Descriptions
1 On when fast idle is engaged
2 On when any input trigger wire is active
On when Gray RPM set wire is grounded
4 On when the Parking Brake is applied with the parking brake
trigger enabled
STATUS Continuously flashes two digit status codes. See Status Code
table
Diagnostics
Diagnostic mode is entered by
momentarily shorting the two gold
“Test” pads together on the module.
The module provides diagnostic LEDs
which illuminate according to the
following table. To exit this mode,
cycle the key or momentarily ground
the “Test” pad again.
AFIS Status Codes
Status Code Description
1-1 Ready for fast idle
2- Triggered: Parking Brake
2-4 Triggered: VBAT Low
2-7 Triggered: Engage Input 2
2-8 Triggered: Engage Input 1
2-9 Triggered: Engage Input
-1 RPM > 2800
-2 RPM < 200
- TR not = to PARK
-4 VSS not = to 0 MPH
-5 Service Brake applied
-7 Unsafe; Need to cycle TR
-8 ECT > 2 0ºF
Fast Idle Status Codes
Status Codes provide the current status of
the Fast Idle system. The on-board
“Status” LED will flash a 2-digit code as
shown in the table. The first digit will flash,
wait half a second, flash the second digit,
then wait one second before the next
code. The Status Codes continue to flash
until the module is reset (cycle key), or the
test input is momentarily grounded again.
InterMotive Inc.
12840 Earhart Avenue
Auburn, CA 95602
Phone: (5 0) 82 -1048
Fax: (5 0) 82 -1516
Page 4 of 6
www.intermotive.net
AFIS420VSX-B-021 18-INS
