Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
WARNING:
Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

WARNING:
Do not place an intact non-deployed airbag face down on a hard surface, the airbag propels into the air if accidentally deployed. Failure to follow these instructions may result in possible serious or fatal injury.
1. Turn the ignition on.
2. With the scan tool, read DTCs and record on the repair order.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (V71/V37) S/C SIGNAL 1 CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Right Steering Wheel Switch harness connector.
3. Turn the ignition on, engine not running.
4. Measure the voltage on the (V71/V37) S/C Signal 1 circuit at the Right Steering Wheel Switch harness connector.
  Is the voltage above 5.2 volts?
  
  Yes
  - Repair the (V71/V37) S/C Signal 1 signal circuit for a short to voltage.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
RIGHT STEERING WHEEL SWITCH
1. Connect a jumper between the (V71/V37) S/C Signal 1 circuit and the (V937) S/C Switch Ground circuit at the Right Steering Wheel Switch harness connector.
2. With the scan tool, read DTCs.
  Does the P0580-SPEED CONTROL SWITCH 1 CIRCUIT LOW set as active or pending with the jumper in place?
  
  Yes
  - Replace the Right Steering Wheel Switch in accordance with the Service Information. Refer to SWITCH, SPEED CONTROL, REMOVAL .
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
STEERING WHEEL JUMPER HARNESS
1. Turn the ignition off.
2. Disconnect the SCM C6 harness connector.
3. Connect a jumper between the (V71/V37) S/C Signal 1 circuit and the (V937) S/C Switch Ground circuit at the SCM C6 component side.
4. Turn the ignition on, engine not running.
5. With the scan tool, read DTCs.
  Does the P0580-SPEED CONTROL SWITCH 1 CIRCUIT LOW set as active or pending with the jumper in place?
  
  Yes
  - Replace the Steering Wheel Jumper Harness in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CLOCKSPRING
1. Turn the ignition off.
2. Disconnect the SCM C2 harness connector.
3. Connect a jumper between the (V71/V37) S/C Signal 1 circuit and the (V937) S/C Switch Ground circuit at the SCM C2 harness connector.
4. Turn the ignition on, engine not running.
5. With the scan tool, read DTCs.
  Does the P0580-SPEED CONTROL SWITCH 1 CIRCUIT LOW set as active or pending with the jumper in place?
  
  Yes
  - Replace the Clockspring in accordance with the Service Information. Refer to CLOCKSPRING, REMOVAL .
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
CHECK THE (V71/V37) S/C SIGNAL 1 CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the PCM C1 harness connector.
3. Measure the resistance of the (V71/V37) S/C Signal 1 circuit between the SCM C2 harness connector and the PCM C1 harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the (V71) Cruise Sense 1 signal circuit for an open or high resistance.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (V937) S/C SWITCH GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (V937) S/C Switch Ground circuit between the SCM C2 harness connector and the PCM C1 harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 8
  No
  - Repair the (V937) S/C Signal Ground circuit for an open or high resistance.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Speed Control Switch and the Powertrain Control Module.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Perform any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Powertrain Control Module in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .