CODE 55 XX -- ONCOMING C3 PRESSURE SWITCH (AFTER SHIFT)

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

CODE 55 XX -- ONCOMING C3 PRESSURE SWITCH (AFTER SHIFT)

Main code 55 indicates the C3 clutch is the oncoming clutch in a shift and the C3 pressure switch did not close at

the end of the shift. When this code is set, the DO NOT SHIFT response and Neutral with No Clutches is

commanded. On the N1 to R shift the transmission is commanded to the previous range. Additional codes could be

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

NOTE:

When an ECU with a version 8 or 8A calibration is used with a pre-TransID transmission, 55 XX codes

are set because the ECU sees wire 195 is open. To correct this condition, convert to a TID 1 internal

harness or install Adapter P/N 200100 available from St. Clair Technologies.

Main

Code

Subcode

Meaning

07*

Oncoming C3PS (after shift), LR shift

17*

Oncoming C3PS (after shift), 1R shift

27*

Oncoming C3PS (after shift), 2R shift

Oncoming C3PS (after shift), N1R shift

Oncoming C3PS (after shift), N1L to R shift

Oncoming C3PS (after shift), X to Y shift

*NOTE: When sump temperature is below 10C (50F), and transmission fluid is C4 (not DEXRON), follow

this procedure when making directional change shifts:

To shift from forward to reverse; select N (Neutral) and then R (Reverse).

Failure to follow this procedure may cause illumination of the CHECK TRANS light and then

transmission operation will be restricted to N (Neutral).

Active Indicator Clearing Procedure:

Power down

Manual -- subcode 87 only

NOTE:

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

other codes.

NOTE:

Check battery and ECU input voltages before troubleshooting.

Troubleshooting:

NOTE:

Do not bring the transmission to operating temperature if the problem occurs at sump temperatures

below that level. Do troubleshooting at the temperature level where the problem occurs.

1. After the transmission is at operating temperature, allow vehicle engine to idle on level ground for

34 minutes. Check transmission fluid level. If improper fluid level is found, correct as necessary.

Improper fluid level could be the cause of the code (not enough or too much fluid may produce

inadequate clutch pressure).

2. Connect a pressure gauge and check main pressure. If pressure is not adequate, the pump is

possibly worn. See Appendix B for main pressure specifications.

0021 00105