Western States Converters and Transmissions logo

OEM TROUBLESHOOTING GUIDE
FOR ALLISON WT TROUBLE CODES


TROUBLESHOOTING WITH DIAGNOSTIC CODES

(Additional troubleshooting information can be found in the appropriate
Allison Troubleshooting Manual.)

CODE LISTINGS AND PROCEDURES

IF CODES READ

RECOMMENDED PROCEDURES

Main
Code

Sub
Code

 
13

12

1. 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.

2. If all points check, call Western States Converters and Transmissions.

ECU Input
Voltage Low

13

13

ECU Input
Voltage Low
(Medium)

13

23

ECU Input Voltage High

14

12, 23

1. 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.

2. If all points check, call Western States Transmissions and Converters.

Oil Level Sensor

  21

12, 23

1. 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.

2. If able, replace TPS.

3. If all points check, call Western States Converters and Transmissions.

Throttle Position Sensor

 22

14, 15, 16

1. Check:

a. Speed sensor connectors are tight, clean and undamaged.

b. Speed sensor mounting bolts are properly torqued (24-29 N.m (18-21 lb ft))

c. Wiring harness to sensors has no opens, shorts between wires, or shorts to ground.

2. If all points check, call Western States Converters and Transmissions.

Speed Sensors

  23

12, 13, 14, 15

1. Check:

a. ECU connectors are tight, clean, and undamaged.

b. Remote shift selector connector is tight and jumper wire is cut.

c. Wiring harness on remote has no opens, shorts between wires, or shorts to ground.

2. If able, replace shift selector(s).

3. If all points check, call Western States Converters and Transmissions.

Shift Selectors

 24

12

1. Check:

a. Air temperature is below -32C (-25F).

1) If yes, this is a correct response for temperature.

2) If no, check that main transmission connector is tight, clean, and undamaged.

b. ECU connectors are tight, clean, and undamaged.

2. If all points check, call Western States Transmissions and Converters.

Sump Oil Temperature Cold

24

23

1. Let vehicle idle with parking brake applied, wheels chocked, and vehicle level. Check:

a. Correct dipstick is installed.

b. Fluid level is correct.

1) If fluid level is incorrect -- correct fluid level.

2) If fluid level is correct -- check for engine system overheating, causing transmission to overheat.

b. ECU connectors are tight, clean, and undamaged.

2. Check if ECU and transmission connectors are tight, clean, and undamaged.

3. If all points check, call Western States Converters and Transmissions.

Sump Oil Temperature Hot

 25

00, 11, 22, 33, 44, 55, 66, 77

1. Check:

a. Speed sensor connector is tight, clean and undamaged.

b. ECU connectors are tight, clean, and undamaged.

c. Fluid level is correct.

d. Sensor mounting bolt torque is correct (24-29 N.m (18-21 lb ft)).

e. Wiring harness to sensor has no opens, shorts between wires, or shorts to ground.

2. If all points check, call Western States Converters and Transmissions.

Output Speed Sensor and Reading

 32

00, 33, 55, 77

1. Let vehicle idle with parking brake applied, wheels chocked, and vehicle level. Check:

a. Correct dipstick is installed.

b. Fluid level is correct.

2. 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.

3. If all points check, call Western States Converters and Transmissions.

C3 Pressure Switch Open

33

12, 23

1. 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.

2. If all points check, call Western States Converters and Transmissions.

Sump Oil Sensor Failure

 34

12, 13, 14, 15, 16

1. If able, recalibrate ECU; if not, replace ECU.

2. If unable to replace ECU, call Western States Converters and Transmissions.

EEPROM

35

00, 16

1. 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.

2. If all points check, call Western States Converters and Transmissions.

Power Interruption EEPROM Write Interruption

  3

00

1. If able, reprogram ECU.

2. If able, replace ECU.

3. If ECU cannot be reprogrammed or replaced, call Western States Converters and Transmissions.

Hardware / Software Not Compatible

 41

12, 13, 14, 15, 16, 21, 22, 23, 24, 25, 26

1. 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.

2. Change wiring harness (optional).

3. If all points check, call Western States Converters and Transmissions.

Open or Short to Ground in Solenoid Circuit

  42

12, 13, 14, 15, 16, 21, 22, 23, 24, 25, 26

1. 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.

2. Change harness (optional).

3. If all points check, call Western States Converters and Transmissions.

Short to Battery in Solenoid Circuit

43

21, 25, 26

1. Check:

a. 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.

2. If able, replace ECU.

3. If all points check, call Western States Converters and Transmissions.

Solenoid Low Side Circuit, Open Driver, or Wire Shorted to Ground

 44

12, 13, 14, 15, 16, 21, 22, 23, 24, 25, 26

1. Check:

a. 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.

2. If all points check, call Western States Converters and Transmissions.

Solenoid Circuit Short to Ground

  45

12, 13, 14, 15, 16, 21, 22, 23, 24, 25, 26

1. Check:

a. Transmission connector is tight, clean, and undamaged.

b. ECU connectors are tight, clean, and undamaged.

c. Wiring harness has no opens.

2. If all points check, call Western States Converters and Transmissions.

Solenoid Circuit Open

51

01, 10, 12, 21, 23, 24, 35, 42, 43, 45, 46, 53, 64, 65

1. 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.

2. Let vehicle idle with parking brake applied, wheels chocked, and vehicle level. Check:

a. Correct dipstick is installed.

b. Fluid level is correct.

3. If all points check, call Western States Converters and Transmissions.

Offgoing Ratio Test (During Shift)

  52

01, 08, 32, 34, 54, 56, 71, 72, 78, 79, 99

1. 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. Main wiring harness to transmission has no shorts between wires, or shorts to ground.

2. Let vehicle idle with parking brake applied, wheels chocked, and vehicle level.

Check:

a. Correct dipstick is installed.

b. Fluid level is correct.

3. If all points check, call Western States Converters and Transmissions.

Offgoing C3 Pressure Switch (During Shift)

  53

08, 18, 28, 29, 38, 39, 48, 49, 58, 59, 68, 69, 78, 99

1. Check:

a. Turbine and engine speed sensor connectors are tight, clean, and undamaged.

b. Speed sensor wiring harness has no opens, shorts between wires, or shorts to ground.

2. Let vehicle idle with parking brake applied, wheels chocked, and vehicle level. Check:

a. Correct dipstick is installed.

b. Fluid Level is correct.

3. If all points check, call Western States Converters and Transmissions.

Offgoing Speed Test (During Shift)

54

01, 07, 10, 12, 17, 21, 23, 24, 27, 32, 34, 35, 42, 43, 45, 46, 53, 54, 56, 64, 65, 70, 71, 72, 80, 81, 82, 83, 85, 86, 92, 93, 95, 96, 97

1. Check:

a. Turbine and output speed sensor connectors are tight, clean, and undamaged.

b. Speed sensor wiring harness has no opens, shorts between wires, or shorts to ground.

2. Let vehicle idle with parking brake applied, wheels chocked, and vehicle level. Check:

a. Correct dipstick is installed.

b. Fluid level is correct.

3. EEPROM calibration is correct for the transmission.

2. If all points check, call Western States Converters and Transmissions.

Oncoming Ratio Test (After Shift)

55

17, 27, 87, 97

1. Let vehicle idle with parking brake applied, wheels chocked, and vehicle level. Check:

a. Correct dipstick is installed.

b. Fluid level is correct.

2. 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.

3. Check:

a. Transmission connector is tight, clean, and undamaged.

b. ECU connectors are tight, clean, and undamaged.

c. C3 pressure switch wiring has no opens, shorts between wires, or shorts to ground.

4. If all points check, call Western States Converters and Transmissions.

Oncoming C3 Pressure Switch (After Shift)

  56

00, 11, 22, 33, 44, 55, 66, 77

1. Check:

a. Turbine and output speed sensor connectors are tight, clean, and undamaged.

b. Speed sensor wiring harness has no opens, shorts between wires, or shorts to ground.

c. Transmission connector is tight, clean, and undamaged.

d. ECU connectors are tight, clean, and undamaged.

2. Let vehicle idle with parking brake applied, wheels chocked, and vehicle level. Check:

a. Correct dipstick is installed.

b. Fluid level is correct.

3. If all points check, call Western States Converters and Transmissions.

Range Verification Test (Between Shifts)

  57

11,22,44,

66,88,99

1. Let vehicle idle with parking brake applied, wheels chocked, and vehicle level. Check:

a. Correct dipstick is installed.

b. Fluid level is correct.

2. Check:

a. Output and turbine speed sensor connectors are tight, clean, and undamaged.

b. Speed sensor wiring harness has no shorts between wires or shorts to ground.

3. Check:

a. Transmission connector is tight, clean, and undamaged.

b. ECU connectors are tight, clean, and undamaged.

c. C3 Pressure switch wiring has no opens, shorts between wires, or shorts to ground.

4. If all points check, call Western States Converters and Transmissions.

Range Verification Test (C3)

  61

00

1. Check:

a. Fluid level is correct.

b. Retarder apply system is not allowing retarder and throttle to be applied at the same time.

c. Fluid cooler is adequately sized for load.

2. If all points check, call Western States Converters and Transmissions.

Retarder Over Temperature

  62

12, 23

1. Check:

a. Retarder temperature measured with DDR is consistent with code; or determine if code is active using shift selector.

b. Ambient temperature is above 178C (352F) or below -45C (-49F).

c. Sensor connector it tight, clean, and undamaged.

d. ECU connectors are tight, clean, and undamaged.

e. Temperature sensor circuit has no opens, shorts, or shorts to ground.

2. If all points check, call Western States Transmissions and Converters.

Retarder Temperature Sensor

  63

00, 26, 40

1. Check input wiring, switches, and connectors to determine why input states are different.

2. If all points check, call Western States Converters and Transmissions.

Input Function Fault

64

12, 23

1. Use DDR to read retarder counts and identify problem wires. Check wiring for short to battery, ground wire open, or short to ground.

2. If all points check, call Western States Converters and Transmissions.

Retarder Modulation Request Device Fault

  65

00

1. Check if engine rating or governor speed is too high for transmission.

2. If all points check, call Western States Converters and Transmissions.

Engine Rating High (Computer-Controlled Engines Only)

 66

00

1. Check:

a. Serial connection to engine computer is tight, clean, and undamaged.

b. SCI wiring harness has no opens, shorts, or shorts to ground.

c. If DDR is not available, also be sure that transmission ECU connections are tight, clean, and undamaged.

2. If all points check, call Western States Converters and Transmissions.

Serial Communications Interface Fault

  69

12, 13, 14, 15, 16, 21, 22, 23, 24, 25, 26, 32, 33, 34, 35, 36, 41

1. Clear diagnostic code and retry vehicle start.

2. If code recurs, reprogram ECU.

3. If able, replace ECU.

4. If code continues to recur, call Western States Converters and Transmissions.

ECU Malfunction

 


Western States Converters and Transmissions logo
224 Jason Crt.
Corona, CA  91719
(951) 279-6393
(888) 463-3499
(951) 279-1847 Fax

email usEmail us: Sam Clemmons

| Home | About Allison | Map-Directions | Contact US | Products | Services | FAQ |