Case IH 2664 (6152.11) - DEC – Transmission Control Unit (TCU) / Transmission ECM: Synchro 1 Solenoid - Generic Error

A malfunction in the circuit of the solenoid valve responsible for actuating the #1 synchronizer in the transmission, typically indicating abnormal voltage pointing to a failed solenoid, a short to the battery in the energize circuit, or a failed ECM.

• MAXXUM T4E

1. 1

   Turn the disconnect switch and the key start switch to the ON position (do not start the engine)

2. 2

   Disconnect the machine harness from the Synchro 1 Solenoid

3. 3

   Inspect the harness and connector for physical damage, moisture, or corrosion

4. 4

   Perform a short-circuit test: Place a jumper wire between the connector contacts at the solenoid harness

5. 5

   Disconnect the machine harness connectors from the Transmission ECM

6. 6

   Measure the resistance from the specific solenoid signal contact on the ECM harness to all possible sources of +Battery (expected result for a healthy circuit is greater than 5000 ohms)

1. 1

   Depressurize

   Depressurize the hydraulic system.

2. 2

   Remove

   Remove the faulty solenoid valve from the transmission valve body.

3. 3

   Install

   Install the new solenoid.

4. 4

   Clear

   Clear the fault codes via the diagnostic port.