Diagnostic Test

ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
1. Ignition on, engine not running.
2. With a scan tool, select View DTCs.
  NOTE: It may be necessary to drive the vehicle using the Speed Control for the fault to become Active.
  
  Is the DTC Active at this time?
  
  Yes
  - Go to step 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
SPEED CONTROL SWITCHES
1. Turn the ignition off.
2. Remove and disconnect the Speed Control Switches from the steering wheel.
3. Measure the resistance across each Speed Control Switch.
4. Monitor the ohmmeter while pressing each function button on each switch.
5. The following resistance specs are taken between terminals (V71) S/C Signal 1 and (V937) S/C Return circuits of the Switch when holding the switch button in the following position:
  - Not pressing any switch - 20.5 kOhms
  - On/Off - 0.47 kOhms
  - Set - 5.49 kOhms
  - Coast - 2.94 kOhms
  - Cancel - 1.24 kOhms
  - Resume/Accel - 15.4 kOhms
  Does the function on the Speed Control Switches have the correct resistance value?
  
  Yes
  - Go to step 3
  No
  - Replace the Speed Control Switch that had the incorrect resistance value.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(V72) S/C SIGNAL 2 CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking S/C Signal 2 Circuit For Short To Voltage
Courtesy of CHRYSLER LLC
1. Disconnect the C3 PCM harness connector.
2. Ignition on, engine not running.
3. Measure the voltage on the (V72) S/C Signal 2 circuit in the S/C Switch harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (V72) S/C Signal 2 circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 4
(V72) S/C SIGNAL 2 CIRCUIT OPEN

Fig 2: Measuring Resistance Of S/C Signal Circuit Between Speed Control Switch Harness Connector And Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER LLC

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 to perform diagnosis.
1. Turn the ignition off.
2. Measure the resistance of the (V72) S/C Signal 2 circuit from the Speed Control Switch to the appropriate terminal of PCM Pinout Box 8815.
  Is the resistance below 5.0 Ohms for each measurement?
  
  Yes
  - Go to step 5
  No
  - Repair the open in the (V72) S/C Signal 2 circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(V937) S/C RETURN CIRCUIT OPEN

Fig 3: Checking S/C Return Circuit For An Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (V937) S/C Return circuit from the S/C Switch harness connector to the appropriate terminals of PCM Pinout Box 8815.
  Is the resistance below 5.0 Ohms for each measurement?
  
  Yes
  - Go to step 6
  No
  - Repair the open in the (V937) S/C Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

SPEED CONTROL SWITCH VOLTAGE VALUES

SWITCH POSITION	SWITCH No. 1 VOLTAGE VALUE	SWITCH No. 2 VOLTAGE VALUE
NO SWITCHES PRESSED	4.31 to 4.78 Volts	4.31 to 4.78 Volts
ON/OFF PRESSED	0.59 to 1.13 Volts	3.53 to 3.92 Volts
RES/ACCEL PRESSED	3.88 to 4.17 Volts	2.04 to 2.47 Volts
SET PRESSED	3.16 to 3.56 Volts	1.17 to 1.56 Volts
COAST PRESSED	2.57 to 2.94 Volts	0.77 to 1.09 Volts
CANCEL PRESSED	1.59 to 1.99 Volts	2.84 to 3.25 Volts

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box 8815 and PCM Pinout Box Adapter 8815-1 to perform diagnosis.

Install the PCM Pinout Box 8815-1 on the C3 PCM harness connector.
Connect the S/C Switch harness connectors.
Connect the Clockspring harness connectors if they were previously disconnected.
Turn the ignition on.
With a scan tool, monitor the S/C Switch voltage readings.
Using a Voltmeter check the voltage on the (V37) S/C Signal 1 circuit and the (V38) S/C Signal 2 circuit at the appropriate terminals of the PCM Pinout Box 8815.
Monitor the Voltmeter.
With a scan tool, monitor the S/C Switch voltage readings.
Compare the voltage readings on the Voltmeter to what the scan tool displayed.
Are the voltage readings out of the listed specification and is there less than a 0.2 of a Volt difference between the Voltmeter switch values and the scan tool switch value?

Yes
- Verify that there is good pin to terminal contact in the Switch and Powertrain Control Module connectors. If OK, replace the Speed Control Switch.
- Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
No
- Go to step 7

POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Speed Control Switch and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Switch and Powertrain Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace and program the Powertrain Control Module in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .