BENDIX ET-2 ELECTRONIC THROTTLE 매뉴얼 - 페이지 3

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DIGITAL

VOLT/

POWER

OHM

SUPPLY

METER

(9-16 VDC)

RESISTOR

TEST LOAD

(47,000 OHM FOR

DETROIT DIESEL,

300,000 OHM

FOR MACK)

POTENTIOMETER

PC. NO. ON THIS

FIGURE 5 - ET-2

™

TREADLE ELECTRICAL TEST

SCHEMATIC FOR THE DETROIT DIESEL CONNECTOR

wear, or physical damage. Check end-to-end electrical

continuity at terminals. NOTE: Potentiometer pin

locations will remain constant (see Figure 5). However,

cable assembly connector pin out may vary from engine

to engine.

2. Remove the ET-2

™

treadle from the vehicle.

3. Secure the ET-2

™

treadle to a smooth, flat surface in

such a way that it does not twist the unit.

4. Connect the potentiometer to the volt meter and power

supply as shown in Figure 5. NOTE: Power supply

can be a 12 VDC vehicle battery in good condition and

with known voltage output.

5. Verify that the closed throttle (idle) output voltage, as

a percentage of supply voltage, is within the limits listed

in Figure 2.

6. Depress the treadle to its full throttle position. The

output voltage, as a percentage of supply voltage,

should be within the limits listed in Figure 2, e.g.

Testing a Detroit Diesel ET-2

Battery = 10 VDC. Full throttle = 9 VDC. 9/10 x 100 =

90%.

7. Make several full applications and record idle position

voltage each time. Verify that idle position voltage does

not vary by more than .4% (.02 volts). If the ET-2

treadle does not operate within its specified ranges,

service the unit, or replace it with a new ET-2

available at your nearest Bendix parts outlet.

PIN C

GROUND

PIN B

VOUT

(OUTPUT)

PIN A

VREF

(INPUT)

POTENTIOMETER

SURFACE

™

Treadle Potentiometer:

™

treadle,

™

FIGURE 6 - ET-2

TREADLE ELECTRICAL TEST

SCHEMATIC FOR THE CUMMINS CONNECTOR

Test 2: For Cummins engines (featuring a separate

potentiometer and idle validation switch):

To test the potentiometer on the vehicle, use steps 1 through

8. Alternatively, instructions for carrying out a "bench test"

is covered in instructions 11 through 16.

1. First construct the "breakout" harness shown in Figure 6.

2. Insert connector X on the breakout harness into the

connector leading from the potentiometer. Then insert

connector Y on the breakout harness into the connector

leading from the dashboard wire harness.

3. Next insert pin 1 into the ground position on a voltmeter.

Then insert pin 2 into the positive position on a volt

meter.

4. Disconnect the idle validation switch cable from the

dashboard wire harness. Connect an ohmmeter to pins

A and B on the connector leading from the idle

validation switch. The positive lead should be

connected to pin A and the negative lead should be

connected to pin B.

5. Turn the vehicle's ignition key to the "battery on"

™

position.

This supplies a 5 volt input to the

potentiometer. Since the idle validation switch is no

longer connected, a fault code may be triggered on

some vehicles. This fault code will be reset at the end

of this test.

PACKARD ELECTRIC

CONNECTOR 12010717

(CONNECTOR X)

INPUT PIN 3

OUTPUT PIN 2

GROUND PIN 1

PACKARD ELECTRIC

CONNECTOR 12015793

(CONNECTOR Y)