CODE 52 XX -- OFFGOING C3 PRESSURE SWITCH TEST DURING SHIFT

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

CODE 52 XX -- OFFGOING C3 PRESSURE SWITCH TEST DURING SHIFT

Main code 52 indicates a failed C3 pressure switch test. When a shift is commanded and C3 is the offgoing clutch,

the ECU expects the C3 pressure switch to open within a period of time after the shift is commanded. If the ECU

does not see the switch open, it assumes C3 has not released. If conditions for a shift exist, the shift is retried. If the

C3 pressure switch still remains closed, the code is logged and the DO NOT SHIFT response is commanded. If the

code is set during a direction change, neutral with no clutches is commanded, otherwise 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:

C3 tests are turned off below a calibrated temperature of 32C (25F).

Main

Code

Subcode

Meaning

L1 upshift

LN1 shift

32 downshift

34 upshift

54 downshift

56 upshift

R1 shift

R2 shift

RN1 shift

R2 shift (R to NNC to 2)

N3N2 shift

XY shift

Active Indicator Clearing Procedure:

Power down

Manual

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. Use the Pro-Link diagnostic tool to check the state of the C3 pressure switch.

2. Check the C3 pressure switch wiring for a short-to-ground or a switch stuck closed (refer to code

32 XX). If a short is found, isolate and repair; or replace the switch if it is stuck closed.

3. If a fault is not found with the C3 pressure switch or circuitry, connect a pressure gauge to the C3

pressure tap.

4. Drive the vehicle to make the shift indicated by the subcode or use the DDR clutch test mode.

Compare actual C3 pressure value with the table of specifications in Appendix B.

0021 0099