ALLISON 3000 MH Transmission Fault Codes DTC

Service technicians have no problem recognising breakdowns and carrying out machine diagnostics, ALLISON 3000 MH Transmission Fault Codes DTC, plus they are familiar with equipment from a variety of manufacturers.

Allison Transmission is an American manufacturer of commercial duty automatic transmissions and hybrid propulsion systems. Allison products are specified by over 250 vehicle manufacturers and are used in many market sectors including bus, refuse, fire, construction, distribution, military, and specialty applications. With headquarters in Indianapolis, Indiana, Allison Transmission has regional offices all over the world and manufacturing facilities in Indianapolis, Chennai, India, and Szentgotthárd, Hungary.

CODES QUICK CHECKS | MAIN CODE | SUB CODE

13 12 Check:
a. Battery direct ground and power connections are tight and clean.
b. Vehicle batteries are charged.
c. Vehicle charging system is not over- or under-charging.
d. VIM fuse is good.
e. VIM connections are tight, clean, and undamaged.
f. Vehicle manufacturer supplied wiring is correct.
g. ECU connectors are tight, clean, and undamaged.

ECU Input Voltage Low

13 13
ECU Input Voltage Medium Low

13 23
ECU Input Voltage High

14 12, 23 Check:
a. Is transmission equipped with oil level sensor?
b. Engine speed sensor, output speed sensor, temperature sensor, and oil level sensor are working correctly.
c. Wiring harness has no opens, shorts to ground, or shorts to battery.

Oil Level Sensor

21 12, 23 Check:
a. TPS connector is properly connected.
b. End of TPS cable is pulled out properly.
c. Engine fuel lever is in idle position.
d. Engine fuel lever provides proper amount of stroke on TPS cable.
e. Wiring harness to TPS has no opens, shorts between wires, or shorts to ground.
f. TPS for proper operation and resistance readings.

Throttle Position Sensor

CODES QUICK CHECKS | MAIN CODE | SUB CODE

22 14, 15, 16 Check:
a. Speed sensors and connectors are tight, clean, and undamaged.
b. Wiring harness to sensors has no opens, shorts between wires, or shorts to ground.

Speed Sensors

23 12, 13, 14, 15, 16 Check:
a. ECU connectors are tight, clean, and undamaged.
b. Shift selector connector is tight, clean, and undamaged.
c. Wiring harness has no opens, shorts between wires, or shorts to ground.
d. Shift selector(s) for proper operation.

Shift Selectors

24 12 Check:
a. Air temperature is below –32°C (–25°F)
• If yes, this is a correct response for temperature.
• If no, check that main transmission connector is tight, clean, and undamaged.
b. ECU connectors are tight, clean, and undamaged.

Sump Fluid Temperature Cold

24 23 Verify the overheat situation. Check:
a. Correct dipstick is installed.
b. Fluid level is correct. Refer to CARE AND MAINTENANCE section.
• If fluid level is incorrect—correct fluid level.
• If fluid level is correct—check for cause of overheating.
c. Check if ECU and transmission connectors are tight, clean, and undamaged.

Sump Fluid Temperature Hot

CODES QUICK CHECKS | MAIN CODE | SUB CODE

25 00, 11, 22, 33, 44, 55, 66, 77 Check:
a. Speed sensor connector is tight, clean, and undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Fluid level is correct. Refer to CARE AND MAINTENANCE section.
d. Wiring harness to sensor has no opens, shorts between wires, or shorts to ground.

Output Speed Sensor
26 00, 11 Check:
a. TPS for proper operation, related harness for opens and shorts.
b. Serial connection to engine is tight, clean, and undamaged.
c. SCI wiring harness has no opens or shorts.

Throttle/Engine Coolant Source Not Detected

32 00, 33, 55, 77 Check:
a. Correct dipstick is installed.
b. Fluid level is correct. Refer to CARE AND MAINTENANCE section.
c. Main transmission connector is tight, clean, and undamaged.
d. ECU connectors are tight, clean, and undamaged.
e. Wiring harness has no opens, shorts between wires, or shorts to ground.

C3 Pressure Switch Open

33 12, 23 Check:
a. Main transmission connector is tight, clean, and undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Wiring harness has no opens, shorts between wires, or shorts to ground.

Sump Oil Temperature Sensor Failure

CODES QUICK CHECKS | MAIN CODE | SUB CODE

34 12, 13, 14, 15, 16, 17
a. Recalibrate ECU, if possible.
EEPROM b. Replace ECU if not possible to recalibrate.

35 00, 16 Check:
a. ECU connectors are tight, clean, and undamaged.
b. VIM connectors are tight, clean, and undamaged.
c. Vehicle manufacturer supplied wiring has correct power and ground connections.
d. Power connections are battery direct.
e. Ground connections are battery direct.
f. Ignition switch connections are correct.

Power Interruption Real Time Write Interruption

36 00, 01, 02
a. If able, recalibrate ECU; if not, replace ECU.
b. Check that ECU is compatible with TransID level (36 01).
c. Troubleshoot TransID wire and circuit for short to battery (36 02).

Hardware/Software Not Compatible

42 12, 13, 14, 15, 16, 21, 22, 23, 24, 26 Check:
a. Main transmission connector is tight, clean, and undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Wiring harness is not pulled too tight, and there is no damage, chafing, or screws through harness.
d. Wiring harness has no opens, shorts between wires, or shorts to ground.
e. Unauthorized repairs have not been made.
f. Change harness (optional).

Short to Battery in Solenoid Circuit

CODES QUICK CHECKS | MAIN CODE | SUB CODE

44 12, 13, 14, 15, 16, 21, 22, 23, 24, 26 Check:
a. Main transmission connector is tight, clean, and undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Wiring harness has no opens, shorts between wires, or shorts to ground.

Solenoid Circuit Short to Ground

45 12, 13, 14, 15, 16, 21, 22, 23, 24, 26
Check: a. b. c.
a. Main transmission connector is tight, clean, and undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Wiring harness has no opens or shorts.

Solenoid Circuit Open

46 21, 26, 27 Check:
a. Main transmission connector is tight, clean, and undamaged.
b. ECU connectors are tight, clean, and undamaged.
c. Wiring harness has no opens, shorts between wires, or shorts to ground.
d. Replace ECU.

Solenoid Overcurrent

51 01, 10, 12, 21, 23, 24, 35, 42, 43, 45, 46, 53, 64, 65, XY* Check:
a. Output and turbine speed sensor connectors are tight, clean, and undamaged.
b. Speed sensor wiring harness has no opens, shorts between wires, or shorts to ground.
c. Correct dipstick is installed.
d. Fluid level is correct. Refer to CARE AND MAINTENANCE section.

Offgoing Ratio Test (During Shift)

The diagnosis tool ALLISON 3000 MH Transmission Fault Codes DTC for trucks provides different possibilities such as information on the use and location of the connectors, detection and description of errors, activation of the fan, compression test and other components, system data information and more.