Auto Machine Diagnosis EPC Download Installation Service

This instruction show you guide on how to solve Caterpillar C9 Engine trouble code 29 30-8 PTO throttle signal invalid error.

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CAT ET 2025A

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The Engine Control Module (ECM) detects the following conditions:

The “PTO Configuration” is programmed to “Remote Throttle”.

The ECM is not receiving a valid signal from the PTO throttle.

The ECM has been powered for at least three seconds.

A remote accelerator position sensor may be used for PTO purposes The remote accelerator position sensor should be connected to terminal 1Pr-68 of the Engine Control Module ECM).Before the ECM will respond to the remote accelerator position sensor, the ECM”PTO Configuration” must be programmed to “Remote Throttle”, and the “PTO On/Off Switch” must be in the ON position.

The remote accelerator position sensor must be powered from the vehicle battery(+ 12 V).A +12 V version of the accelerator position sensor must be used for the remote accelerator position sensor,and the +8 V version for the accelerator pedal position sensor must be used in the cab.

The ECM will not respond to the remote accelerator position sensor while 253-02 diagnostic-code is active.Refer to Troubleshooting,”ECM Memoy-Test if 253-02 diagnostic code is active.

The remote accelerator position sensor provides a throttle position signal to the ECM.The output of the remote accelerator position sensor is a constant frequency signal with a pulse width that varies with the position of the sensor.This output signal is referred to as either a duty cycle or a pulse width modulated signal (PWM).

The output signal of the remote accelerator position sensor is expressed as a percentage between 3 and 100 percent.The accelerator position sensor will produce a duty cycle of 10 to 22 percent at low idle and 75 to 90 percent when the sensor is fully actuated. The percent of duty cycle is translated in the ECM into a throttle position of 3 to 100 percent.

If the vehicle is using the ECM dedicated PTO functions, the accelerator position sensor will be ignored while the engine is in “PTO Mode’ and the “PTO Configuration” is programmed to the “Remote Throttle” option.

The ECM is in”PTO Mode” while the PTO on/off switch is on. This can be checked through the status screen on Caterpillar Electronic Technician (ET).

The ECM will not respond to the remote accelerator position sensor when both of the following conditions are met:

The PTO on/off circuit is switched from the OFF position to the ON position.

The ECM reads the remote accelerator position sensor above low idle.

This prevents the engine from experiencing unexpected acceleration or sudden acceleration when the PTO on/off circuit is turned on.The remote accelerator position sensor must return to low idle before the ECM will respond. The ECM must also see a transition from the OFF position to the ON position in the PIO on/off switch in order to Allow the other PIO speed control functions to operate.If the engine is started with the PTO on/off switch in the ON position, the accelerator will respond. The response will occur only if the accelerator pedal is first returned to the low idle position, The other engine speed controls will not respond.

Probable Causes:

1 ECM Connection

2 Remote accelerator position sensor

3 Remote accelerator position sensor harness

4 Remote accelerator throttle

Caterpillar ET 2025A Test ECM Mode transforms an ECM into a Test ECM for diagnostic purposes.Here is a instruction show you guide on how to use CAT ET 2025A test ECM mode.

Note: After activating Test ECM Mode, the ECM will remain in Test ECM Mode for 24 engine hours unless deactivated. If a longer diagnostic test is required, then the Test ECM Mode will have to be reactivated before the 24-hour period expires.

Related Contents:

CAT ET 2025A

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Caterpillar 18 digits factory password calculator

Accessing

To place an ECM into ECM Test Mode, select “ECM Mode” from the Service menu.

Screen Layout

The Test ECM Mode screen consists of the Time Area, The Status Line, and the Instruction Area:

Time Area

The Time Area occupies the top of the Test ECM Mode screen and it displays the time remaining in Test ECM Mode. When the time remaining reaches 1 hour, the service tool enlarges the display of the Time Area and displays the following message on the Status Line: “Less than 1 hour of test ECM time remaining.”

Status Line

The Status Line occupies the center of the Test ECM Mode screen. It displays whether the ECM is Active, Not Active, or Reactivating. If Test ECM Mode is to continue beyond the 24 engine hour period, the ECM must be reactivated.

Instruction Area

The Instruction Area occupies the lower portion of the Test ECM Mode screen. It displays instructions, constraints, and usage tips for the Test ECM Mode.

Buttons

The following buttons are available on the Test ECM Mode screen:

Activate/Reactivate – Select the Activate button to begin Test ECM mode. While Test ECM Mode is active, the Activate button changes to the Reactivate button, which will allow the ECM to remain in Test ECM Mode beyond the default 24 engine-hour time limit.

Note: An ECM cannot be activated if the ECM has expired from test mode (the engine serial number has been permanently programmed into the ECM) or if engine or vehicle speeds are present.

Terminate-Select this button to bring the ECM out of Test ECM Mode and back to its standard operating mode.