Guardian Technologies 4451 & 4986, 4583 Test 52 Check Idle Control Switch, TB2, SW2 Offon

Section 6

DIAGNOSTIC TESTS

Connect one meter test lead to pin location J2-10 Wire 44S of the connector just removed. Be careful not to damage the pin connectors with the test leads. Connect the other meter test lead to Wire 44S at Terminal Block 2 (TB2). CONTINUITY should be measured.

3.Connect one meter test lead to pin location J2-12 Wire 11S. Be careful not to damage the pin connectors with the test leads. Connect the other meter test lead to Wire 11S at Terminal Block 2 (TB2). CONTINUITY should be measured.

	44S 11S
		00.00
	TB2
	STEP 2
	STEP 3
	STEP 2	STEP 3
J2-1	J2-12

	MAKE SURE THE TEST
	PROBE CONNECTOR IS
	MAKING CONTACT
	WITH THE CONNECTOR.
J2 HARNESS CONNECTOR	DOUBLE CHECK TO
	MAKE SURE THAT THE
	TIP IS SHARP.

Figure 6-58. – Check Wires 11S & 44S

RESULTS:

1.If CONTINUITY was not measured, repair or replace the wire harness.

2.If CONTINUITY was measured, refer back to the flow chart.

TEST 52 - CHECK IDLE CONTROL SWITCH

(SW2)

PROCEDURE:

1.Set a voltmeter to measure resistance.

2.Disconnect Wire 0 and Wire 83 from the Idle Control Switch (SW2).

3.Connect meter test leads across both terminals of SW2. See Figure 6-59.

4.In the OFF position the meter should read INFINITY or Open. In the ON position the meter should read CONTINUITY or Closed.

RESULTS:

1.If the switch fails Step 4 replace it.

2.If the switch is good refer back to the flow chart.

SW2

OFFON

OL 00.00

Figure 6-59. – Check Idle Control Switch (SW2)

TEST 53 - CHECK IDLE CONTROL WIRING

PROCEDURE:

1.Set a voltmeter to measure resistance.

2.Disconnect Wire 0 from the Idle Control Switch (SW2).

3.Connect one meter test lead to Wire 0. Connect the other meter test lead to frame ground. CONTINUITY should be measured. If continuity is not measured repair or replace Wire 0 between SW2 and the ground terminal.

4.Disconnect Wire 83 from SW2. Disconnect the J2 connector from the printed circuit board.

5.Connect one meter test lead to Wire 83 previously removed from SW2. Connect the other meter test lead to pin location J2-2 on the J2 connector. See Figure 6-60. Be careful not to damage the pin connectors with the test leads. CONTINUITY should be measured. If CONTINUITY is not measured repair or replace Wire 83 between the J2 connector and Terminal Block or between the Terminal Block and SW2.

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