Starting Aid Output Circuit

397

TM 9-2320-312-24-2

Troubleshooting Section

Output 2 is available to connect a relay and/or a

F. Connect the electronic service tool to the cab

solenoid in order to control a starting aid system.

data link connector.

The parameter "Starting Aid Output" must be

programmed to "Automatic" in order to use output 2

G. Access the electronic service tool status screen.

as a starting aid output.

H. While the switch status is being monitored

Typical starting aid systems inject ether into the inlet

on the electronic service tool status screen

manifold in order to aid starting of the engine during

alternately remove the jumper wire between the

cold weather operation. The output is automatically

two terminals, and alternately insert the jumper

controlled by the ECM. The reading from the

wire between the two terminals.

coolant temperature sensor is used to determine

if conditions require the use of the starting aid.

Refer to Table 202.

If a fault condition exists with the circuit for the

coolant temperature sensor, the reading from the

Expected Result:

inlet manifold temperature sensor will be used. The

starting aid output will be enabled for a maximum

The switch status changes per the information in

of 30 seconds while the engine is cranking and

Table 202.

the temperature reading is below 0 C (32 F). The

starting aid output will be disabled if the engine

Results:

speed rises above 500 rpm. The starting aid output

Yes The problem is in the vehicle wiring

will also be disabled if a condition that prevents fuel

injection occurs.

between the bulkhead connector and the switch.

Repair: Perform the following repair:

Inspect the vehicle wiring and repair the vehicle

wiring, as required. If the problem still exists with

the wiring, send the vehicle to the OEM dealer.

STOP.

No The problem is in the vehicle wiring between

the bulkhead connector and the ECM.

Repair: Perform the following repair:

Inspect the vehicle wiring and repair the vehicle

wiring, as required. If the problem still exists with

the wiring, send the vehicle to the OEM dealer.

g00838120

Illustration 171

STOP.

Schematic for the starting aid circuit

i01619084

Starting Aid Output Circuit -

Test

SMCS Code: 1456-081

System Operation Description:

Use this procedure under the following situation:

Use this procedure in order to determine if the circuit

for the Starting Aid Output is operating properly.

The following background information is related

to this procedure:

OCT01 Software

Starting Aid Output