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The PerfectPass "Drive by Wire" (DBW) system for new electronic throttle
engines results in a simplified and enhanced version of PerfectPass. From the
drivers seat, PerfectPass operation is virtually identical to the present mechanical
systems. PerfectPass is now comprised of just three main parts:
1. DBW Master Control Module
2. DBW Plug & Play Engine Wiring Harness
(PCM)
3. In-Dash Display
How it Operates:
The ECM of an electronic throttle engine allows an external device such as
PerfectPass to control the engine rpm using the throttle servo motor when all
control signals are valid and manual throttle lever position exceeds the rpm level
request of PerfectPass.
Just three individual wires in the PerfectPass DBW wiring harness connect the
speed control to the engine ECM.
1. The Request Line from PerfectPass requests the ECM to allow PerfectPass
to take control.
2. The Status Line from the ECM indicates PerfectPass now has control of the
engine. The Status Line is the signal that confirms engagement (beeper) and
system control.
3. The VGOV Line establishes the engine RPM level as set by PerfectPass.
Problems with PerfectPass should be rare given the few components that now
make up the system. Most troubleshooting will simply involve voltage/continuity
testing on the PerfectPass engine harness.
PerfectPass Control Systems
Tige 2006
Troubleshooting
(Electronic Throttle Engines)
Engine
Harness
(902) 468-2150
Display
Harness
Page 1
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Related Manuals for PERFECTPASS DWB
Summary of Contents for PERFECTPASS DWB
- Page 1 1. The Request Line from PerfectPass requests the ECM to allow PerfectPass to take control. 2. The Status Line from the ECM indicates PerfectPass now has control of the engine. The Status Line is the signal that confirms engagement (beeper) and system control.
-
Page 2: Wiring Identification
Problems with PerfectPass Controlling/Not Controlling Open connection/broken wire) symptoms of a PerfectPass DBW system Problem #1 RQST Line Open – PerfectPass never takes control in any mode, the engine is controlled only by the manual throttle handle. Problem #2 VGOV Line Open (RQST Line OK) – With the PerfectPass system control ON, the engine will not go above idle no matter how far the manual throttle is pushed. - Page 3 If the engine holds RPM at approximately 2800, but the S does not appear on screen, then check continuity of the Status Line. Locate the 14-pin engine connector on the PerfectPass Module. You will need to apply test tee connectors or insert small test pins beside the wires as they exit the connector to be able to measure the voltage present on each wire.
- Page 4 Problem – Key is on, but PerfectPass screen does not become active and show data. Check – PerfectPass requires 12+ volts for start up. Check voltage on red wire (12 v) power source to Master Module. Problem – Button on PerfectPass Display does not work.
-
Page 5: Software Adjustments
System Reset – To reset the entire system back to original factory values, press & hold ON/OFF & MENU Keys together as you turn key on to power PerfectPass. Continue holding for a few seconds until [ System Reset ^ = Yes ] appears. Then simply answer questions as they appear.