Specifications

Testing Testing Electronic Throttle Systems

Clearing EDK Throttle Values

Whenever the adaptation values are cleared, a new DME is installed, or the EDK unit is replaced,

the throttle settings must be configured in the DME. The adaptation process takes about 20

seconds. If the adaptation process has not successfully completed, then the engine will not start.

z To clear EDK throttle values:

1. Turn the ignition on for 10 seconds (do not start the engine).

2. Turn the ignition off for 10 seconds.

3. Start the engine.

IMPORTANT:

To prevent damage to the control module, allow at least 3 minutes for the ECM/TCM to power

down after the ignition is turned off before disconnecting it.

NOTE:

i Setting the throttle adaptation on EDK systems may cause lose of throttle response and poor run

condition. To begin throttle adaptation, turn the ignition on (do not start the engine) for 30 seconds.

Then turn ignition off for 10 seconds. Start engine and throttle control should be OK.

4.5.3 All Systems Fail-safe Emergency Operation

If a fault is detected, both the MIL and EML lamps may be illuminated. The system will initiate fail-

safe measures depending on the effect of the fault (increased airflow or decreased airflow). If

there is a fault in the idle speed actuator/circuit, the system will compensate to maintain idle. If the

fault causes increased air flow (actuator failed open), then VANOS (variable valve timing) and

knock control are deactivated, noticeably reducing engine performance.

Emergency operation normally is divided into two modes of operation:

• Emergency Operation 1—This is when faults occur which do not impair actuator control, but

do affect the system from functioning properly. For example, if one of the potentiometers fails,

the engine will slowly reach maximum speed with limited power (half throttle capacity).

• Emergency Operation 2—This is when faults occur which impair actuator control. Engine

speed is limited to 1300 RPM and vehicle speed is limited to 20–25 MPH.

NOTE:

i Emergency operation can be caused by power braking (simultaneously pressing both accelerator

and brake pedal).