24H Motor Grader Transmission Electronic Control System And Hydraulic Calibrations Caterpillar

Caterpillar Monitoring System

Usage:

24H 7KK

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Illustration 1	g00484687
Caterpillar Monitoring System (1) Speedometer/tachometer module. (2) Main display module. (3) Gauge cluster module. (4) Alert indicators. (5) Display area.

Caterpillar Monitoring System is an input and an output of the ECM. These two electronic controls communicate back and forth on the CAT data link.

The Caterpillar Monitoring System receives information from the ECM. The following information is shown on the monitor:

The status of the current gear is shown on the display area (5) .
The speed of the machine is shown on the speedometer/tachometer module (1).
The angle of articulation is shown on the gauge cluster module (3).
The status of the parking brake is shown on one of the alert indicators (4).
The angle of the ripper is shown on the display area (5).
The diagnostic service codes are shown on the display area (5).

The Caterpillar Monitoring System sends information about the harness code to the transmission ECM. The harness code tells the transmission ECM the machine sales model. The Caterpillar Monitoring System also sends operating instructions to the transmission ECM. The operating instruction commands the transmission ECM to change operating modes. The modes that are available are in the following table. The operating instructions also tell the transmission ECM to clear service codes that are stored in the memory of the transmission ECM.

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Illustration 2	g00349472
Main Display Module Of Caterpillar Monitoring System (1-10) Alert indicators. (11) Display area.

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Table 1
Mode Of Operation	Mode Number
Normal	0
Harness Code	1
Numeric Readout	2
Service	3
Tattletale	4
Units	5
Calibration	6
Calibration (Articulation Gauge)	7

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Illustration 3	g00484963

The 4C-8195 Service Tool enables personnel to access information that is related to service. The service tool attaches to the 4 pin connector which is located behind a plate directly below the Caterpillar Monitoring System.

In order to access mode "6" for the transmission ECM, perform the following steps:

Attach the service tool to the 4 pin connector below the Caterpillar Monitoring System.

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Illustration 4	g00484974
Display Area (Mode 6)

Press up both the service "SCROLL" and "CLEAR" switches on the service tool. The Caterpillar Monitoring System will scroll to different display modes in the display area (2). Display mode "6" is used by the transmission ECM. The two switches should be held until the Caterpillar Monitoring System display area shows "-6-".

When the Caterpillar Monitoring System gets to display mode "6", the status of the service switches are sent to the transmission ECM: "SET", "CLEAR" and operator switches. The ECM tells the Caterpillar Monitoring System the text to display.

Because several functions must be done in one Caterpillar Monitoring System display mode, there are several sub-modes. Different information is displayed in the different sub-modes. Holding down on the SET switch for 0.5 seconds will cause the current sub-mode to be displayed. If the SET switch is held down for 2.0 seconds, then the sub-modes will change to the next sub-mode. For example, in order to change to sub-mode "-6.3-", follow this sequence: Hold down the "SET" switch. The display area would show "-6.1-" for 2.0 seconds. Next "-6.2-" would be displayed for 2.0 seconds. Then, the display area would show "-6.3-". When the service person releases the "SET" switch, the display would be in sub-mode 3.

Sub-Modes

There are thirteen sub-modes in Mode 6 for the Caterpillar Monitoring System.

Sub-Mode "6.1" (Display Shifting)

This mode displays the status of the following items: the shift lever, the actual gear and the lockup clutch.

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Table 2
Display					Lever Position	Actual Gear Position	Lockup Clutch Status
6	F	3	F	L	6th Fwd	3rd Fwd	ON
6	F	3	F		6th Fwd	3rd Fwd	OFF
	N	N		Neutral	Neutral	OFF
3	R	3	R	L	3rd Rev	3rd Rev	ON

Sub-Mode 6.2 (Display Lever Switches)

This mode displays the status of the input for the shift lever for the lower gears: second speed, first speed, forward direction, reverse direction, neutral switch input and redundant neutral switch input

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Table 3
Display						Explanation
		F		n	n	The forward and both neutral switches are active.
		F			n	The forward and the redundant neutral switch are active.
2			r			The reverse and second speed switches are active.
	1	F				The forward and first speed switches are active.

Sub-Mode 6.3 (Display Lever Switches)

This mode displays the status of the input for the shift lever for the higher gears: sixth speed, fifth speed, fourth speed and third speed

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Table 4
Display				Explanation
		4		The fourth speed switch is active.
6	5			The sixth speed and fifth speed switches are active.
			3	The third speed switch is active.

Sub-Mode 6.4 (Display Transmission Solenoids)

This mode displays the status of transmission solenoids 1 to 6. Turn OFF the parking brake. Move the shift lever from neutral to each gear.

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Table 5
Display					Explanation
		4		1	Solenoid 4 and solenoid 1 are ON (3R)
	4		Solenoid 4 is ON (Neutral)
6		2	Solenoid 6 and solenoid 2 are ON (1F)
	5		3		Solenoid 5 and solenoid 3 are ON (4F)

Sub-Mode 6.5 (Display Lock Parameters)

This mode displays the status of the following components: Differential lock switch, Differential unlock solenoid and Differential lamp

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Table 6
Display						Explanation
d	1		0		1	The differential switch is in LOCK. The differential solenoid is OFF. The differential lamp is ON.
d	0		1		0	The differential switch is in UNLOCK. The differential solenoid is ON. The differential lamp is OFF.

Sub-Mode 6.6 (Display Brake Parameters)

This mode displays the state of the input for the brake pedal and the brake lamp.

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Table 7
Display						Explanation
b	1	0	0		1	The brake pedal is fully depressed. The brake lamp is ON.
b		5		0		The brake pedal is depressed 5%. The brake lamp is OFF.
b	7	3	1	The brake pedal is depressed 73%. The brake lamp is ON.
b	H	I	0	The brake pedal is shorted to +battery. The brake lamp is OFF.
b		L	O	0	The brake pedal is shorted to ground. The brake lamp is OFF.

Sub-Mode 6.7 (Display Neutralize Parameters)

This mode displays the status of the input for the neutralizer pedal.

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Table 8
Display						Explanation
n		1	0	0		The neutralizer pedal is fully depressed.
n		8	2			The neutralizer pedal is depressed 82%.
n	0			The neutralizer pedal is fully released.
n	H	I		The neutralizer pedal is shorted to +battery or the circuit is open.
n		L	O		The neutralizer pedal is shorted to ground.

Sub-Mode 6.8 (Display or Calibrate Ripper Position Sensor)

This mode displays the status of displacement of the ripper. This mode enables the operator to calibrate the ripper position sensor. The machine must be operating at the time of calibration.

Note: See Testing and Adjusting, "System Calibrations" for more information regarding calibration of the ripper position sensor.

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Table 9
Display						Explanation
r		1	0	0		The ripper is fully up.
r		5	0			The ripper is 50% up.
r	0			The ripper is just touching ground.
r		7	5		The ripper is 75% down.
r		1	0	0		The ripper is fully down.
r	H	I	The ripper position sensor is shorted to +battery or there is an open circuit.
r	L	O	The ripper position sensor is shorted to ground.

Sub-Mode 6.9 (Display or Calibrate Articulation Sensor)

This mode displays the status of the angle of articulation. This mode also allows calibration of the articulation sensor.

Note: See Testing and Adjusting, "System Calibrations" for more information regarding calibration of the articulation sensor.

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Table 10
Display						Explanation
A		1	5			The articulation is 15 degrees to the right.
A		0				There is no articulation.
A		2	0		The articulation is 20 degrees to the left.
A	H	I		The articulation sensor is shorted to +battery or there is an open circuit.
A		L	O		The articulation sensor is shorted to ground.

Sub-Mode 6.10 (Display Miscellaneous Inputs And Outputs)

This mode displays the status of several components: parking brake, backup alarm, key start switch and start relay. The first position is the parking brake. The second position is the backup alarm. The third position is the key start switch. The fourth position is the starter relay.

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Table 11
Display				Explanation
1	0	1	1	The parking brake is on. The backup alarm is off. The key is on. The starter is on.
0	0	1	0	The parking brake is off. The backup alarm is off. The key is on. The starter is off.
0	1	0	0	The parking brake is off. The backup alarm is on. The key is off. The starter is off.