Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read TCM DTCs and record on work order.
3. With the scan tool erase DTCs.
4. Turn ignition off for ten seconds.
5. Turn ignition on.
6. Actuate the Upshift (+) Switch.
7. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE DOWNSHIFT (-) SWITCH CIRCUIT VOLTAGE
1. Turn the ignition off.
2. Disconnect the paddle switches.
3. Connect the negative lead of a DVOM to the (Z156) ground terminal and the positive lead to the (T831) Tap Shift Return circuit.
4. Turn the ignition to the Run position.
  Is there battery voltage present?
  
  Yes
  - Go To 8
  No
  - Go To 3
CHECK THE (T831) TAP SHIFT RETURN CIRCUIT VOLTAGE
1. Disconnect the paddle switches.
2. Using a DVOM, connect the negative lead to a known good ground and connect the positive lead to the (T831) Tap Shift Return circuit at the TCM side harness connector.
3. Turn the ignition on.
  Is there battery voltage present?
  
  Yes
  - Go To 7
  No
  - Go To 4
CHECK THE (T831) TAP SHIFT RETURN CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the TCM harness connector.
3. Disconnect the Paddle Switch connector.
4. Measure the resistance of the (T831) Tap Shift Return circuit.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the(T831) Tap Shift Return circuit for an open or high resistance.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
CHECK THE (T831) TAP SHIFT RETURN CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the TCM harness connector.
3. Disconnect the Paddle Switch connector.
4. Measure the resistance of the (T831) Tap Shift Return circuit and ground.
  Is there continuity between the (T831) Tap Shift Return circuit and ground?
  
  Yes
  - Repair the (T831) Tap Shift Return circuit for a short to ground.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
  No
  - Replace the TCM in accordance with the Service Information.
    Refer to MODULE, TRANSMISSION CONTROL (TCM), REMOVAL AND INSTALLATION .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
CHECK THE (T831) TAP SHIFT RETURN CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Turn the ignition off.
2. Disconnect the TCM harness connector.
3. Disconnect the Paddle Switch connector.
4. Measure the resistance of the (T831) Tap Shift Return circuit and all other circuits at the TCM harness connector.
  Is there continuity between the (T831) Tap Shift Return circuit and any other circuit?
  
  Yes
  - Repair the (T831) Tap Shift Return circuit for a short to another circuit.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
  No
  - Replace the TCM in accordance with the Service Information.
    Refer to MODULE, TRANSMISSION CONTROL (TCM), REMOVAL AND INSTALLATION .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
CHECK THE (Z156) GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the TCM harness connector.
3. Disconnect the Paddle Switch connector.
4. Measure the resistance of the (Z156) Ground circuit.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 8
  No
  - Repair the (Z156) Ground circuit for an open or high resistance.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
REPLACE THE PADDLE SWITCH AND RETEST FOR DTC
1. Replace the Paddle switch.
2. Connect the component and all harness connectors.
3. Using the Environmental Data or When Monitored Conditions above, operate the vehicle within the conditions that set the DTC.
4. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Using the schematics as a guide, check the Transmission Control Module (TCM) terminals and connectors for corrosion, damage or pushed out terminals. Pay particular attention to the power and ground circuits. If no problems are found, replace the TCM. Refer to MODULE, TRANSMISSION CONTROL (TCM), REMOVAL AND INSTALLATION .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
  No
  - Replacing the faulty component repaired the fault.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .