966M XE and 972M XE Wheel Loaders Caterpillar

Transmission Slips Event Codes

List of Event Codes for In Gear Slip Detect Feature

The following table defines the codes related to a Transmission Slip event.

In Gear Slip Detect Feature

The In Gear Slip Detect feature continuously monitors input, planetary, and output speeds, while the transmission is in gear, to determine if the transmission is slipping.

E2201 Transmission Slip Detected in First Forward Range

Machine Response:

Transmission unable to engage in FORWARD from NEUTRAL or unable to transmit the appropriate level of torque in LOW FORWARD range.

Note: Troubleshoot all related electrical diagnostics prior to starting this troubleshooting procedure. Related diagnostics include: (CID 1401) XMSN Solenoid #1. (CID 669) XMSN Input Speed Sensor (CID 2820) XMSN Planetary Speed Sensor (CID 585) XMSN Output Speed Sensor #1 (CID 673) XMSN Output Speed Sensor #2 (CID 2817) XMSN Synchro #1 Position Sensor

1. Check the coil resistance for Transmission Solenoid #1 If the coil resistance is out of specification, replace the coil. Otherwise, continue to the next step.
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   Table 2

   312-8629 Solenoid
   Temperature	Resistance (Ohms)
   -40.0 °C (-40 °F)	3.7 ± 1.0
   25 °C (77 °F)	5.0 ± 1.0
   100 °C (248 °F)	6.5 ± 1.0

2. Confirm that both output speed sensors are properly seated in the XMSN case and the bolts are torqued to specification. Check the transmission clutch #1 valve for any sign of visible leaks.

3. Prepare to run the ET Clutch Pressure service test procedure. Add current measurement for XMSN Synchronizer Modulation Solenoid. Add pressure gauges (3500 kPa (508 psi) range for charge pressure, Transmission Clutch Valve #1, Transmission Clutch Valve #2. Warm up the XMSN to 40 °C (104 °F) hydrostatic outlet oil temperature.

4. Run the ET Clutch Pressure service test procedure. Record the measurements noted in the previous step along with information provided on the ET service test screen. Fill out the following table during the noted conditions (expected results are shown in the table).

Result 1: The XMSN clutch Solenoid #1 current is incorrect. Troubleshoot the XMSN harness and ECM.

Result 2: The XMSN charge pressure is low during all portions of the clutch test procedure. Troubleshoot the XMSN charge pump and hydraulic circuit.

Result 3:The XMSN clutch #1 pressure is incorrect. If unable to build clutch pressure, swap the clutch valves to see if the low pressure problem follows the valve. If it does, replace the valve corresponding to the low clutch pressure. If the issue does not follow the valve when swapped, remove the manifold and inspect the manifold seals. If the seals are good, contact product support for further troubleshooting information.

Result 4: The XMSN clutch #1 valve pressure is correct. Pull the transmission suction screen. If considerable material is found, contact product support. Some metal shavings are expected with normal transmission operation.

Note: If the clutch pressure test & visual inspection yield results within specification, contact product support for further information.

E2202 Transmission Slip Detected in Second Forward Range

Machine Response:

Transmission unable to engage in High Forward from Low Forward or unable to transmit the appropriate level of torque in High Forward Range.

Note: Troubleshoot all related electrical diagnostics prior to starting this troubleshooting procedure. Related diagnostics include: (CID 1402) XMSN Solenoid #2. (CID 669) XMSN Input Speed Sensor (CID 2820) XMSN Planetary Speed Sensor (CID 585) XMSN Output Speed Sensor #1 (CID 673) XMSN Output Speed Sensor #2 (CID 2818) XMSN Synchro #2 Position Sensor

1. Check the coil resistance for Transmission Solenoid #2 If the coil resistance is out of specification, replace the coil. Otherwise, continue to the next step.
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   Table 4

   312-8629 Solenoid
   Temperature	Resistance (Ohms)
   -40.0 °C (-40 °F)	3.7 ± 1.0
   25 °C (77 °F)	5.0 ± 1.0
   100 °C (248 °F)	6.5 ± 1.0

2. Confirm that both output speed sensors are properly seated in the XMSN case and the bolts are torqued to specification. Check the transmission clutch #1 valve for any sign of visible leaks.

3. Prepare to run the ET Clutch Pressure service test procedure. Add current measurement for XMSN Synchronizer Modulation Solenoid. Add pressure gauges (3500 kPa (508 psi) range for charge pressure, Transmission Clutch Valve #1, Transmission Clutch Valve #2. Warm up the XMSN to 40 °C (104 °F) hydrostatic outlet oil temperature.

4. Run the ET Clutch Pressure service test procedure. Record the measurements noted in the previous step along with information provided on the ET service test screen. Fill out the following table during the noted conditions (expected results are shown in the table).

Result 1: The XMSN clutch Solenoid #2 current is incorrect. Troubleshoot the XMSN harness and ECM.

Result 2: The XMSN charge pressure is low during all portions of the clutch test procedure. Troubleshoot the XMSN charge pump and hydraulic circuit.

Result 3:The XMSN clutch #2 pressure is incorrect. If unable to build clutch pressure, swap the clutch valves to see if the low pressure problem follows the valve. If it does, replace the valve corresponding to the low clutch pressure. If the issue does not follow the valve when swapped, remove the manifold and inspect the manifold seals. If the seals are good, contact product support for further troubleshooting information.

Result 4: The XMSN clutch #2 valve pressure is correct. Pull the transmission suction screen. If considerable material is found, contact product support. Some metal shavings are expected with normal transmission operation.

Note: If the clutch pressure test & visual inspection yield results within specification, contact product support for further information.

E2203 Transmission Slip Detected in Auxiliary Range

Machine Response:

Transmission unable to engage in Auxiliary Range from HIGH Forward or unable to transmit the appropriate level of torque in Auxiliary Range.

Note: Troubleshoot all related electrical diagnostics prior to starting this troubleshooting procedure. Related diagnostics include: (CID 1401) XMSN Solenoid #1. (CID 669) XMSN Input Speed Sensor (CID 2820) XMSN Planetary Speed Sensor (CID 585) XMSN Output Speed Sensor #1 (CID 673) XMSN Output Speed Sensor #2 (CID 2819) XMSN Synchro #3 Position Sensor (CID2836) XMSN Synchronizer #3, Solenoid #1

1. Check the coil resistance for Transmission Solenoid #1 and XMSN Synchronizer #3, Solenoid #1. If the coil resistance is out of specification, replace the coil. Otherwise, continue to the next step.
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   Table 6

   312-8629 Solenoid
   Temperature	Resistance (Ohms)
   -40.0 °C (-40 °F)	3.7 ± 1.0
   25 °C (77 °F)	5.0 ± 1.0
   100 °C (248 °F)	6.5 ± 1.0

2. Confirm that both output speed sensors are properly seated in the XMSN case and the bolts are torqued to specification. Check the transmission clutch #1 valve for any sign of visible leaks.

3. Prepare to run the ET Clutch Pressure service test procedure. Add current measurement for XMSN Synchronizer Modulation Solenoid. Add pressure gauges (3500 kPa (508 psi) range for charge pressure, Transmission Clutch Valve #1, Transmission Clutch Valve #2 and XMSN Synchronizer #3, Solenoid #1. Warm up the XMSN to 40° C (104° F) hydrostatic outlet oil temperature.

4. Run the ET Clutch Pressure service test procedure. Record the measurements noted in the previous step along with information provided on the ET service test screen. Fill out the following table during the noted conditions (expected results are shown in the table).

Result 1: The XMSN clutch Solenoid #1 current is incorrect. Troubleshoot the XMSN harness and ECM.

Result 2: The XMSN charge pressure is low during all portions of the clutch test procedure. Troubleshoot the XMSN charge pump and hydraulic circuit.

Result 3:The XMSN clutch #1 pressure is incorrect. If unable to build clutch pressure, swap the clutch valves to see if the low pressure problem follows the valve. If it does, replace the valve corresponding to the low clutch pressure. If the issue does not follow the valve when swapped, remove the manifold and inspect the manifold seals. If the seals are good, contact product support for further troubleshooting information.

Result 4: The XMSN clutch #1 valve pressure is correct. Pull the transmission suction screen. If considerable material is found, contact product support. Some metal shavings are expected with normal transmission operation.

Warm up the transmission to at least 60° C (140° F). While monitoring the Synchronizer #3 pressure gauge, try to engage auxiliary range and see if the pressure is at least 1400 kPa (203 psi).  In ET, check the Synchro#3 %DC position.  Is it between 68-73%?  Please contact product support with this information and await further instructions.

E2301 Transmission Slip Detected in First Reverse Range

Machine Response:

Transmission unable to engage in Low Reverse Range from neutral or unable to transmit the appropriate level of torque in Low Reverse Range.

Note: Troubleshoot all related electrical diagnostics prior to starting this troubleshooting procedure. Related diagnostics include: (CID 1402) XMSN Solenoid #2. (CID 669) XMSN Input Speed Sensor (CID 2820) XMSN Planetary Speed Sensor (CID 585) XMSN Output Speed Sensor #1 (CID 673) XMSN Output Speed Sensor #2 (CID 2818) XMSN Synchro #2 Position Sensor.

1. Check the coil resistance for Transmission Solenoid #2. If the coil resistance is out of specification, replace the coil. Otherwise, continue to the next step.
   Show/hide table

   Table 8

   312-8629 Solenoid
   Temperature	Resistance (Ohms)
   -40.0 °C (-40 °F)	3.7 ± 1.0
   25 °C (77 °F)	5.0 ± 1.0
   100 °C (248 °F)	6.5 ± 1.0

2. Confirm that both output speed sensors are properly seated in the XMSN case and the bolts are torqued to specification. Check the transmission clutch #1 valve for any sign of visible leaks.

3. Prepare to run the ET Clutch Pressure service test procedure. Add current measurement for XMSN Synchronizer Modulation Solenoid. Add pressure gauges (3500 kPa (508 psi) range for charge pressure, Transmission Clutch Valve #1, Transmission Clutch Valve #2 and XMSN Synchronizer #3, Solenoid #1. Warm up the XMSN to 40 °C (104 °F) hydrostatic outlet oil temperature.

4. Run the ET Clutch Pressure service test procedure. Record the measurements noted in the previous step along with information provided on the ET service test screen. Fill out the following table during the noted conditions (expected results are shown in the table).

Result 1: The XMSN clutch Solenoid #2 current is incorrect. Troubleshoot the XMSN harness and ECM.

Result 2: The XMSN charge pressure is low during all portions of the clutch test procedure. Troubleshoot the XMSN charge pump and hydraulic circuit.

Result 3:The XMSN clutch #2 pressure is incorrect. If unable to build clutch pressure, swap the clutch valves to see if the low pressure problem follows the valve. If it does, replace the valve corresponding to the low clutch pressure. If the issue does not follow the valve when swapped, remove the manifold and inspect the manifold seals. If the seals are good, contact product support for further troubleshooting information.

Result 4: The XMSN clutch #2 valve pressure is correct. Pull the transmission suction screen. If considerable material is found, contact product support. Some metal shavings are expected with normal transmission operation.

Note: If the clutch pressure test & visual inspection yield results within specification, contact product support for further information.

E2302 Transmission Slip Detected in Second Reverse Range

Machine Response:

Transmission unable to engage in high reverse Range from low reverse or unable to transmit the appropriate level of torque in high reverse Range.

Note: Troubleshoot all related electrical diagnostics prior to starting this troubleshooting procedure. Related diagnostics include: (CID 1401) XMSN Solenoid #1. (CID 669) XMSN Input Speed Sensor (CID 2820) XMSN Planetary Speed Sensor (CID 585) XMSN Output Speed Sensor #1 (CID 673) XMSN Output Speed Sensor #2 (CID 2817) XMSN Synchro #1 Position Sensor

1. Check the coil resistance for Transmission Solenoid #1 If the coil resistance is out of specification, replace the coil. Otherwise, continue to the next step.
   Show/hide table

   Table 10

   312-8629 Solenoid
   Temperature	Resistance (Ohms)
   -40.0 °C (-40 °F)	3.7 ± 1.0
   25 °C (77 °F)	5.0 ± 1.0
   100 °C (248 °F)	6.5 ± 1.0

2. Confirm that both output speed sensors are properly seated in the XMSN case and the bolts are torqued to specification. Check the transmission clutch #1 valve for any sign of visible leaks.

3. Prepare to run the ET Clutch Pressure service test procedure. Add current measurement for XMSN Synchronizer Modulation Solenoid. Add pressure gauges (3500 kPa (508 psi) range for charge pressure, Transmission Clutch Valve #1, Transmission Clutch Valve #2. Warm up the XMSN to 40 °C (104 °F) hydrostatic outlet oil temperature.

4. Run the ET Clutch Pressure service test procedure. Record the measurements noted in the previous step along with information provided on the ET service test screen. Fill out the following table during the noted conditions (expected results are shown in the table).

Result 1: The XMSN clutch Solenoid #1 current is incorrect. Troubleshoot the XMSN harness and ECM.

Result 2: The XMSN charge pressure is low during all portions of the clutch test procedure. Troubleshoot the XMSN charge pump and hydraulic circuit.

Result 3:The XMSN clutch #1 pressure is incorrect. If unable to build clutch pressure, swap the clutch valves to see if the low pressure problem follows the valve. If it does, replace the valve corresponding to the low clutch pressure. If the issue does not follow the valve when swapped, remove the manifold and inspect the manifold seals. If the seals are good, contact product support for further troubleshooting information.

Result 4: The XMSN clutch #1 valve pressure is correct. Pull the transmission suction screen. If considerable material is found, contact product support. Some metal shavings are expected with normal transmission operation.

Note: If the clutch pressure test & visual inspection yield results within specification, contact product support for further information.