Diagnostic Test

ACTIVE DTC
1. Ignition on, engine not running.
  NOTE: This DTC is a two trip fault. If the scan tool indicates a one trip failure, the possible cause may have been the customer pressing the switch in two positions simultaneously. Test drive the vehicle and activate the Speed Control system. If the DTC matures to an active fault a repair is necessary.
2. Ask the customer if it is possible that button was held in two positions at the same time before this DTC set. If this is the case, no repair is necessary.
3. Start the engine.
4. Allow the engine to reach normal operating temperature.
5. With a scan tool, select View DTCs.
  NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.
  
  Is the DTC Active or Pending 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 Switch from the steering wheel in accordance with the service information.
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 (V72) S/C Signal 2 and (V937) S/C Switch Ground circuit of the Switch when holding the switch button in the following position:
  - Not pressing any switch - 20.5 kOhms
  - On/Off - 8.87 kOhms
  - Set - 0.825 kOhms
  - Coast - 0.47 kOhms
  - Cancel - 3.92 kOhms
  - Resume/Accel - 1.87 kOhms
6. The following resistance specs are taken between terminals (V71) S/C Signal 1 and (V937) S/C Switch Ground circuit 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 Switch 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 .
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking S/C Switch Circuit
Courtesy of CHRYSLER LLC
1. Disconnect the C3 PCM harness connector.
2. Turn the ignition on.
3. Measure the voltage on the (V71) S/C Signal 1 circuit at the Speed Control harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (V71) S/C Signal 1 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 SHORTED TO VOLTAGE

Fig 2: Checking S/C Signal 2 Circuit
Courtesy of CHRYSLER LLC
1. Measure the voltage on the (V72) S/C Signal 2 circuit at the Speed Control 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 5
(V71) S/C SIGNAL 1 CIRCUIT OPEN

Fig 3: Checking S/C Signal 1 Circuit
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 PCM Pinout Box 8815 to perform diagnosis.
1. Turn the ignition off.
2. Measure the resistance of the (V71) S/C Signal 1 circuit from the Speed Control 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 excessive resistance in the (V71) Signal 1 circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(V72) S/C SIGNAL 2 CIRCUIT OPEN

Fig 4: Checking S/C Signal 2 Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (V72) S/C Signal 2 circuit from the Speed Control harness connector to the appropriate terminal of PCM Pinout Box 8815.
  Is the resistance below 5.0 Ohms for each measurement?
  
  Yes
  - Go to step 7
  No
  - Repair the excessive resistance 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 SWITCH GROUND CIRCUIT OPEN

Fig 5: Checking S/C Switch Circuit
Courtesy of CHRYSLER LLC

NOTE: The measurement must be taken from both Speed Control Switch harness connectors.
1. Measure the resistance of the (V937) S/C Switch Ground circuit at the Speed Control harness connector to the appropriate terminal of PCM Pinout Box 8815.
  Is the resistance below 5.0 Ohms for both measurements?
  
  Yes
  - Go to step 8
  No
  - Repair the excessive resistance in the (V937) S/C Switch Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO THE (V937) S/C SWITCH GROUND CIRCUIT

Fig 6: Checking S/C Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (V937) S/C Switch Ground circuit and both of the (V71) S/C Signal 1 circuit in the S/C Switch harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the short between the (V937) S/C Switch Ground circuit and the (V71) S/C Signal 1 circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 9
(V72) S/C SIGNAL 2 CIRCUIT SHORTED TO THE (V937) S/C SWITCH GROUND CIRCUIT

Fig 7: Checking S/C Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (V937) S/C Switch Ground circuit and both of the (V72) S/C Signal 2 circuit in the S/C Switch harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the short between the (V937) S/C Switch Ground circuit and 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 10
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO THE (V72) S/C SIGNAL 2 CIRCUIT

Fig 8: Checking S/C Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (V71) S/C Signal 1 circuit and the (V72) S/C Signal 2 circuit at the Speed Control harness connector.
  Is the resistance below 100 Ohms for each circuit?
  
  Yes
  - Repair the short between the (V72) S/C Signal 2 circuit and the (V71) S/C Signal 1 circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 11
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO GROUND

Fig 9: Checking S/C Switch 1 Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (V71) S/C Switch Signal 1 circuit at the S/C Switch harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short to ground in the (V71) S/C Signal 1 circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 12
(V72) S/C SIGNAL 2 CIRCUIT SHORTED TO GROUND

Fig 10: Checking S/C Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the ((V72) S/C Signal 2 at the S/C Switch harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short to ground 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 13

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 PCM Pinout Box 8815 and PCM Pinout Box Adapter 8815-1 to perform diagnosis.

Connect the C3 PCM harness connector and the S/C Switch harness connector.
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.
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
Start the engine and allow it to reach normal operating temperature.
Monitor the voltmeter.
Allow the engine to idle.
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 values?

Yes
- Verify that there is good pin to terminal contact in the Switch and Powertrain Control Module connectors. Replace the Speed Control Switch if no problems are found in the connectors.
- Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
No
- Go to step 14

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 .