BENDIX SD-15-4106 manual Digital Volt Powerohm Supply Meter 9-16 VDC PIN C

DIGITAL

VOLT/

POWEROHM

SUPPLY METER (9-16 VDC)

	PIN C
RESISTOR	GROUND
TEST LOAD	PIN B
(47,000 OHM FOR
DETROIT DIESEL,	VOUT
300,000 OHM	(OUTPUT)
FOR MACK)	PIN A
	VREF
	(INPUT)
	POTENTIOMETER
	POTENTIOMETER
	PC. NO. ON THIS
	SURFACE

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™Treadle Potentiometer: 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™treadle, available at your nearest Bendix parts outlet.

A B C

PACKARD ELECTRIC CONNECTOR 12010717 (CONNECTOR X)

INPUT PIN 3

OUTPUT PIN 2

GROUND PIN 1

	PACKARD ELECTRIC
	CONNECTOR 12015793
C B A	(CONNECTOR Y)

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.

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