PTO Switch Circuit

351

TM 9-2320-312-24-2

Troubleshooting Section

Repair: Perform the following diagnostic

i01611141

procedure:

PTO Switch Circuit - Test

Troubleshooting, "Check Engine Lamp Circuit -

SMCS Code: 1165-081-ZS

Test"

System Operation Description:

STOP.

Use this procedure under the following situation:

Test Step 3. Check the State of the

Related Conditions when the Vehicle is

Use this procedure to determine that the vehicle

Parked

wiring and the ECM are functioning properly for the

features of Dedicated PTO.

A. Check the state of the following related conditions

when the vehicle is parked:

The following background information is related

to this procedure:

a. Ensure that the vehicle speed is 0 km/h

(0 mph) on Cat ET or the dash display.

INPUT #1

b. Ensure that the engine is not in cold mode.

The input 1 is used for the circuit for the PTO on/off

switch when the PTO Configuration is programmed

Note: The Cat ET status screen will indicate if the

to "Cab Switches", "Remote Switches", or "Remote

cold mode is active.

Throttle".

c. Ensure that the PTO on/off switch is on.

When the PTO on/off switch is on, the ECM will be

in Dedicated PTO mode.

Expected Result:

When the ECM is in the Dedicated PTO mode the

Result 1 Vehicle speed is not indicated as 0 km/h

PTO Top Engine Limit (TEL) is activated. The engine

(0 mph).

may proceed directly to the PTO engine rpm set

speed if the parameter is programmed. If a PTO

Result 2 The Cat ET status screen indicates that

switch on lamp is connected to the output 1, the

the engine is in the cold mode.

PTO switch on lamp will turn on whenever the PTO

on/off circuit is on.

Result 3 The PTO on/off switch is not on.

If the problem is with undetermined PTO kickouts,

Results:

use the following procedure:

Result 1 Continue by testing the vehicle speed

Operate the vehicle in PTO mode.

circuit.

After the kickout, review the status parameter on

Repair: Perform the following diagnostic

ET. The status parameter indicates the cause of the

procedure: Troubleshooting, "Vehicle Speed

kickout. This must be performed before the ignition

Circuit - Test"

key switch is turned off. It is important to remember

that the parameter will only indicate the last kickout

STOP.

since the ECM has been powered by the ignition

key switch.

Result 2 The engine must not be in cold mode

operation while this test procedure is being

This parameter is blank when the ECM is first

performed. Allow the engine to run until the

powered up. If this parameter is blank, "No

coolant temperature exceeds 38 C (100 F).

Occurrence" or "Not Kicked Out" is indicated. This

Troubleshoot and repair any related conditions.

parameter remains blank until the ECM detects the

STOP.

use of the PTO mode. Also, this parameter remains

blank until the ECM detects the disengagement of

Result 3 Continue by testing the circuit for the

PTO mode. Refer to Table 184 in order to interpret

PTO on/off switch.

the status parameter.

Repair: Perform the following diagnostic

The following kickout status parameter is available:

procedure: Troubleshooting, "PTO Switch Circuit -

Test"

PTO kickout

STOP.