CODE 32 XX -- C3 PRESSURE SWITCH

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

CODE 32 XX -- C3 PRESSURE SWITCH (Figure 510)

Main code 32 indicates the transmission gear ratio is correct, but the C3 pressure switch is open when it should be

closed.

NOTE:

When an ECU with a version 8 or 8A calibration is used with a pre-TransID transmission, 32 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

C3 switch open in low range

(MD 3070 or HD 4070 only)

C3 switch open in third range

C3 switch open in fifth range

C3 switch open in reverse range

Active Indicator Clearing Procedure:

Power down

Manual

Self-clearing

NOTE:

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

Troubleshooting:

1. Disconnect the transmission "T" harness connector at the ECU and the transmission. Check the

C3 switch circuit for opens, shorts to other wires, shorts-to-ground, or short-to-battery. If wiring

problems are found, isolate and repair. The C3 pressure switch closes at 206.8 48 kPa (30 7 psi);

resistance should be 2 Ohms maximum when the switch is closed and 20,000 to infinity when the

switch is open. Infinity is often indicated as OL (over limit) on a DVOM.

2. If problems are not found in the external harness, drain the fluid, remove the control module, and

check the internal harness for opens, shorts between wires, or shorts-to-ground (refer to the proper

transmission Service Manual). If wiring problems are found, isolate and repair.

3. If no wiring problems are found, replace the C3 pressure switch.

4. If the problem recurs, use a spare wire, if available, or provide a new wire (St. Clair P/N 200153

may be used for this purpose) for the C3 pressure switch circuit.

5. If the problem recurs again, replace the internal harness.

6. If the condition persists, replace the ECU. If replacing the ECU corrects the problem, reinstall the

original (bad) ECU to confirm that the problem is in the ECU. If the original ECU now works, in-

spect the ECU connectors for any corrosion or damage which may cause an intermittent condition.

If the original problem recurs, reinstall the replacement ECU.

0021 0075