CODES
DTC 524223-1 - XMSN Reverse Pressure Less Than Commanded
DTC 524224-1 - XMSN Forward 2 Pressure Less Than Commanded
DTC 524225-1 - XMSN Forward 1 Pressure Less Than Commanded
DTC 524229-1 - REV 1 Valve Pressure Auto Low, Calibration Failure
DTC 524270-1 - FWD 2 Valve Pressure Auto Low, Calibration Failure
DTC 524276-1 - FWD 1 Valve Pressure Auto Low, Calibration Failure
POSSIBLE CAUSE
A. LOW TRANSMISSION OIL LEVEL
B. SENSOR SUPPLY OPEN CIRCUIT
C. SENSOR FAILURE
D. FUNCTIONAL FAILURE - MECHANICAL
NOTE
Please refer to the end of this procedure for supporting diagrams.
COMPONENT OPERATIONAL CHECK
PROCEDURE OR ACTION:
1. Turn power to OFF for no less than 30 seconds, and then to ON to clear displayed DTC.
Does reported DTC reoccur?
YES: Go to Step 2.
NO: Problem not verified. Resume operation.
2. Conduct a quick visual inspection of all connectors/wiring associated with the displayed fault code.
Are any faults detected/observed?
YES: Repair/replace connector or wiring associated with faults found. See Electrical System 2200SRM1142.
NO: Go to Cause B.
CAUSE A - LOW TRANSMISSION OIL LEVEL
PROCEDURE OR ACTION:
1. Ensure truck power is OFF.
2. Check transmission oil level. See Operating Manual.
Is transmission oil at the proper level?
YES: Go to Cause B.
NO: Fill transmission to proper level. See Operating Manual.
Diagnostic Trouble Codes Electrical System
Check the Service Manual section in Hypass Online for possible updates and check pertinent Grams
9030-20-38 Confidential/Proprietary - Do Not Copy or Duplicate
Transmission Pressure Less Than Commanded Pressure (Cont)
CAUSE B - SENSOR SUPPLY OPEN CIRCUIT
PROCEDURE OR ACTION:
1. Ensure truck power isOFF.
2. Disconnect indicated sensor connector.
3. Turn truck power ON.
4. Change DMM to volts scale.
5. At sensor harness connector, measure voltage across sensor supply pin (+) and sensor ground pin (-).
Is voltage approximately 5 Vdc?
YES: Sensor supply circuit is OK. Go to Cause C.
NO: Go to Step 6.
6. Move negative (-) meter probe to a clean frame ground.
Is voltage approximately 5 Vdc?
YES: Sensor ground has open circuit. Locate and repair/replace open wire/connection. See Wire Harness
Repair 2200SRM1128.
NO: Sensor supply has open circuit. Locate and repair/replace open wire/connection. See Wire Harness Repair
2200SRM1128.
CAUSE C - SENSOR FAILURE
PROCEDURE OR ACTION:
1. Ensure truck power is OFF.
NOTE: Do not discard original sensor after removal.
2. Replace sensor.
3. Ensure that all connections are completely inserted.
4. Turn truck power ON.
Does reported DTC reoccur?
YES: Reinstall original sensor and go to Cause D. See Electrical System 2200SRM1142.
NO: Problem has been corrected. Resume operation. Discard faulty sensor.
Electrical System Diagnostic Trouble Codes
Check the Service Manual section in Hypass Online for possible updates and check pertinent Grams
Confidential/Proprietary - Do Not Copy or Duplicate 9030-20-39
Transmission Pressure Less Than Commanded Pressure (Cont)
CAUSE D - FUNCTIONAL FAILURE - MECHANICAL
PROCEDURE OR ACTION:
NOTE: The reporting of these DTCs will result in the transmission control being disabled by the VSM. It will be
necessary to bypass the VSM and externally power the enable valve to operate the transmission.
This can be done by connecting the normal VSM output end of the coil to a switched battery supply. See schematic.
1. At the DSC, from the MAIN MENU, scroll down to DIAGNOSTICS, ENTER.
2. At the DIAGNOSTICS MENU, scroll to view the XMSN/BRAKE data display, ENTER.
NOTE: This test needs to be performed while maintaining a constant speed with no pack braking and no power
reversal.
3. Scroll to view XMSN FORWARD, (XMSN HIGH for 2 Speed), or REVERSE PRESSURE readout.
Does display indicate pressure of 896 to 1000 kPa (130 to 145 psi)?
YES: Perform Component Operational Check.
NO: Go to Observed Symptoms, Transmission Is Too Hot, Page 9040-30-43.