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Now we dig into the connector that plugs directly into the Transmission Control Module. It has 26 pins, some of which go the black or gray 8 way connectors, the TJ harness, and a fused power source from the battery. Lets take a close look at what each pin does and where it needs to go.
Pin 1 Input Speed Sensor Ground - This is a violet with light green stripe. It needs to connect to Pin 5 on the black 8 way plug. It completes input speed sensor circuit.
Pin 2 Input Speed Sensor Signal - This is a red with black stripe wire. It needs to connect to Pin 1 on the black 8 way plug. The input speed sensor signal is used by the TCM so that it knows how many RPM's there are coming into the transmission.
Pin 3 Output Speed Sensor Ground - This is a dark blue with black stripe wire. It needs to connect to Pin 6 on the black 8 way plug. It completes the output speed sensor circuit.
Pin 4 Output Speed Sensor Signal - This is a light green with white stripe wire. It needs to connect to Pin 7 on the black 8 way plug. The output speed sensor signal is used by the TCM so that it knows how many RPM's there are coming out of the transmission.
Pin 5 (Not used)
Pin 6 CCD BUS (-) - This is part of the information bus used by the XJ TCM and PCM to share OBD2 information. Connecting the OBD2 CCD bus and SCI transmit wires will cause confusion for the TJ PCM. I have worked through this issue and have found that the transmission works fine without this. I will go into more detail on this later in the write up.
Pin 7 CCD BUS (+) - This is part of the information bus used by the XJ TCM and PCM to share OBD2 information. Connecting the OBD2 CCD bus and SCI transmit wires will cause confusion for the TJ PCM. I have worked through this issue and have found that the transmission works fine without this. I will go into more detail on this later in the write up.
Pin 8 (Not used)
Pin 9 TRS T3 Sense (TRS 3 Sense) - This is a violet wire. It needs to connect to Pin 2 on the gray 8 way plug. It's purpose is to apply 12 volts to pin 9 on the TCM telling the TCM that the shifter is in the 3 range.
Pin 10 (Not used)
Pin 11 Transmission Solenoid C (Lockup) - This is a dark blue with white stripe wire. It needs to connect to Pin 4 on the black 8 way plug. The TCM uses this solenoid to engage and disengage the lockup.
Pin 12 Transmission Solenoid A - This is a white wire. It needs to connect to Pin 3 on the black 8 way plug. The solenoids are used by the TCM to shift the transmission.
Pin 13 Transmission Solenoid B - This is an orange with white stripe wire. It needs to connect to Pin 2 on the black 8 way plug. The solenoids are used by the TCM to shift the transmission.
Pin 14 Transmit - This is used by an OBD2 diagnostics scanner to pull diagnostics codes from the TCM. Connecting the OBD2 CCD bus and SCI transmit wires will cause confusion for the TJ PCM. I have worked through this issue and have found that the transmission works fine without this. I will go into more detail on this later in the write up.
Pin 15 (Not used)
Pin 16 Sensor Return (Sensor Ground) - This is a brown with yellow stripe wire. This will tie into the wire bundle coming out of the TJ PCM on connector 1 pin A4. When we pull sensor signals off the TJ harness we need to send to signal ground back to the TJ PCM sensor return. This completes the circuit the TCM needs to get signals from the TJ throttle position sensor and brake switch sense circuits.
Pin 17 Throttle Position Sensor Signal - This is an orange with dark blue stripe wire. This will tie into the wire bundle coming out of the TJ PCM on connector 1 pin A23. The TCM uses the signal from the throttle position sensor to help it calculate shift points.
Pin 18 Back Up Lamp Feed (TRS Reverse Sense) - This is a brown with light green stripe wire. It needs to connect to Pin 6 on the gray 8 way plug. It's purpose is to apply 12 volts to pin 18 on the TCM telling the TCM that the shifter is in the reverse range.
Pin 19 (Not used)
Pin 20 (Not used)
Pin 21 T42 Sense (TRS 1-2 Sense) - This is a violet with white stripe wire. It needs to connect to Pin 1 on the gray 8 way plug. It's purpose is to apply 12 volts to pin 21 on the TCM letting the TCM know that the shifter is in the 1-2 range.
Pin 22 TRS T1 Sense (TRS Overdrive Sense) - This is a light green with black stripe wire. It needs to connect to Pin 4 on the gray 8 way plug. It's purpose is to apply 12 volts to pin 22 on the TCM telling the TCM that the shifter is in the OD range.
Pin 23 Brake Switch Sense - This is a white with pink stripe wire. This will tie into the wire bundle coming out of the TJ PCM on connector 3 pin C24. This allows the TCM to know when the brakes are being applied.
Pin 24 Ground - This is a black with tan strip wire. This will tie into the wire bundle coming out of the TJ PCM on connector 1 pin A31 or A32. Provides a ground for the TCM.
Pin 25 Fused B (+) - This is a pink 20 gauge wire. Rather than tear apart the power distribution center I chose to run this straight to the battery positive terminal. You will want to use an inline 15A fuse. This wire provides constant power for the TCM.
Pin 26 Fused Ignition Switch Input (Start-Run) - This is a dark blue with white stripe wire. When you turn on the key to the run or start mode this sends power to the TCM. This will tie into the wire bundle coming out of the TJ PCM on connector 1 pin A2.
