CODE 53 XX -- OFFGOING SPEED TEST (DURING SHIFT)

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

CODE 53 XX -- OFFGOING SPEED TEST (DURING SHIFT)

Main code 53 indicates a failed offgoing speed test. The speed test during a shift is designed to ensure neutral is

attained during shifts to neutral. This test compares engine speed to turbine speed. If neutral is selected and turbine

speed is found to be much lower than engine speed, the ECU sees this as neutral not being attained. The

transmission is commanded to Neutral with No Clutches and code 53 XX is set. Additional codes could be logged

for other shifts where "X" indicates the range from and "Y" indicates the range to.

NOTE:

This test is not performed if neutral output is below 200 rpm or when temperatures are below a

calibrated 0C (32F).

Main

Code

Subcode

Meaning

LN1 shift

1N1 shift

2N1 shift

2N2 shift

3N1 shift

3N3 shift

4N1 shift

4N3 shift

5N1 shift

5N3 shift

6N1 shift

6N4 shift

RN1 shift

N3N2 or N2N3 shift

XY shift

Active Indicator Clearing Procedure:

Power down

Manual -- subcodes 78 and 99 only

NOTE:

Before troubleshooting, read Paragraph 56. Also, check battery and ECU input voltages.

NOTE:

Intermittent connections or lack of battery-direct power and ground connections may cause this and

other codes.

Troubleshooting:

1. Be sure the transmission is warm and the fluid level is correct. Correct transmission fluid level as

necessary.

2. Using the DDR, check the engine and turbine speed sensor signals under steady conditions. If a

tachometer is available, compare the tachometer reading with the engine rpm reading on the

diagnostic tool. Check signals in neutral, at idle, high idle, and maximum no load rpm. If a signal

is erratic, check sensor wiring for opens, shorts, and shorts-to-ground (refer to code 22XX).

Check all connections for dirt and corrosion. If wiring problems are found, repair or replace as

necessary.

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