6–90 Copyright © 1998 General Motors Corp.
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
Main code 52 indicates a failed C3 pressure 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 –32ºC (–25°F).
Active Indicator Clearing Procedure:
• Power down
• Manual
NOTE: Before troubleshooting, read Pages 6–17 and 6–18 of Section 6–5. 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.
Main
Code
Subcode Meaning
52 01 L–1 upshift
52 08 L–N1 shift
52 32 3–2 downshift
52 34 3–4 upshift
52 54 5–4 downshift
52 56 5–6 upshift
52 71 R–1 shift
52 72 R–2 shift
52 78 R–N1 shift
52 79 R–2 shift (R to NNC to 2)
52 99 N3–N2 shift
52 XY X to Y shift
CODE 52 XX — OFFGOING C3 PRESSURE SWITCH TEST DURING SHIFT
To Next Page
Loading...