Actron AutoAnalyzer CP7665 User Manual download pdf (Page 18)

5. Turn multimeter rotary switch

to 200mV DC range.

If multimeter overranges, turn mul-

timeter rotary switch to the

2000mV DC range. (See Setting

the Range on page 6)

6. Crank engine until steady

reading is on display.

• Record results at each point

as displayed on multimeter.

• Repeat Step 4 & 5 until all

points are checked.

7. Test Results –

Estimated Voltage Drop of

Starter Circuit Components

Component Voltage

Switches 300mV

Wire or Cable 200mV

Ground 100mV

Test Procedure (see Fig. 20):

1. Disable ignition system so ve-

hicle won’t start.

Disconnect the primary of the

ignition coil or the distributor pick-

up coil or the cam/crank sensor

to disable the ignition system.

Refer to vehicle service manual

for disabling procedure.

2. Insert BLACK test lead into

COM test lead jack.

3. Insert RED test lead into

test lead jack.

4. Connect test leads.

Refer to Typical Cranking Volt-

age Loss Circuit (Fig. 20).

•

Connect RED and BLACK test

leads alternately between 1 & 2,

2 & 3, 4 & 5, 5 & 6, 6 & 7, 7 & 9,

8 & 9, and 8 & 10.

Red Black

Fig. 20 Typical Cranking Voltage

Loss Circuit

Solenoid

This is a representative

sample of one type of

cranking circuit. Your vehicle

may use a different circuit

with different components or

locations. Consult your

vehicle service manual.

Starter

Voltage Drops

This test measures the voltage drop across wires, switches, cables, solenoids,

and connections. With this test you can find excessive resistance in the starter

system. This resistance restricts the amount of current that reaches the starter

motor resulting in low battery load voltage and a slow cranking engine at starting.

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