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Test readings, control module connections

Test readings, control module connections




Extent

The following pages contain values and instructions for obtaining readings of signals and levels on the heater.

Remember


Note the test conditions and use your common sense when judging the test results.

Unless otherwise stated, the test readings presented are with the ignition switch in the ON position.

First check that the control module is supplied with current and grounded.

Then check all sensor inputs and signals from other systems.

Finally, check the control module outputs. Remember that the test readings do not indicate whether or not the actuator is in working order.







If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which ought to be checked more thoroughly.

The test readings given apply to a correctly calibrated Fluke 88/97.

The readings %(+) and ms(+) indicate the pulse ratio and pulse duration. A test instrument capable of measuring both pulse ratio and pulse duration must be used. The + sign denotes a positive trigger pulse (TRIG+).



Connector B1




> = greater than; < = less than; » = approximately equal to; ∼= alternating current

Pins with no additional comments have no pin connection. (LP = LOGIC PROBE; P = select pulse; p = perceptible pulses)





Pin

Component/Function

Input/Output

Test conditions

Across

Test reading

See

1

+30





1-B+

< 0.5 V



2

Ground





2-B-

< 0.1 V



3

MCC/ACC











4

Fuel pump

Output



4-2

» 10 Ohm



5

No connection







6

Main relay, heater











7

No connection











8

No connection













Connector B2




> = greater than; < = less than; » = approximately equal to; ∼= alternating current

Pins with no additional comments have no pin connection. (LP = LOGIC PROBE; P = select pulse; p = perceptible pulses)





Pin

Component/Function

Input/Output

Test conditions

Across

Test reading

See

1

Water pump +

Output









2

Water pump -

Output









3

Combustion air fan -

Output









4

Combustion air fan +

Output









5

Glow plug +

Output



5-6

0,8 - 0,9 Ohm



6

Glow plug -

Output



5-6

0,8 - 0,9 Ohm



7

No connection











8

No connection











9

Engine coolant temperature sensor 2

Input



9-10

As in diagram



10

Engine coolant temperature sensor 2

Input



9-10

As in diagram



11

Engine coolant temperature sensor 1

Input



11-12

As in diagram



12

Engine coolant temperature sensor 1

Input



11-12

As in diagram



13

Flame temperature sensor

Input



13-14

As in diagram



14

Flame temperature sensor

Input



13-14

As in diagram