Diagnostic Test

1) DTC IS ACTIVE

NOTE: Refer to the following table when diagnosing speed control switch voltage DTCs.

-	Switch 1 Voltage (pin A27)	Switch 2 Voltage (pin A26)
On/Off - Min.	0.5882	3.5294
On/Off - Max.	1.1373	3.9216
Set - Min.	3.1569	1.1765
Set - Max.	3.5686	1.5686
Cancel - Min.	1.5882	2.8431
Cancel - Max.	2.0000	3.2549
Accel - Min.	3.8824	2.0392
Accel - Max.	4.1765	2.4706

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 both switches simultaneously. Test drive the vehicle and activate the Speed Control system. If the DTC matures to an active fault a repair is necessary.

Start the engine and allow it to idle for at least 60 seconds.

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 can result in personal injury or death.

NOTE: It may be necessary to test drive the vehicle and operate the speed control in order for this DTC to set.

With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

Go to step 2).

Refer to *CHECKING FOR AN INTERMITTENT DTC diagnostic procedure.

2) SPEED CONTROL SWITCH

Fig 1: Connecting Jumper Wire Between S/C Signal 2 Circuit And S/C Switch Ground Circuit In Control Switch Harness Connector
Courtesy of CHRYSLER LLC

Turn the ignition off.

Remove the Speed Control Switch in accordance with the Service Information.

Turn the ignition on.

With a scan tool, read the (V72) S/C Signal 2 voltage.

NOTE: The (V72) S/C Signal 2 voltage should be above 4.8 volts with the Speed Control Switch removed.

Connect a jumper wire between the (V72) S/C Signal 2 circuit and the (V937) S/C Switch Ground circuit in the Speed Control Switch harness connector.

With a scan tool, read the (V72) S/C Signal 2 voltage.

NOTE: The (V72) S/C Signal 2 voltage should be below.2 volts with the jumper wire in place.

Is the (V72) S/C Signal 2 voltage above 4.8 volts with the Speed Control Switch removed and below.2 volts with the jumper wire in place?

Yes
1. Replace the Speed Control Switch in accordance with the Service Information.
2. Perform PCM VERIFICATION TEST .
No
1. Go to step 3).
3) CLOCKSPRING
Turn the ignition off.

Disconnect the C5 Steering Control Module (SCM) harness connector.

Turn the ignition on.

With a scan tool, read the (V72) S/C Signal 2 voltage.

NOTE: The voltage should be above 4.8 volts with the C5 Steering Control Module (SCM) connector disconnected.

Connect a jumper wire between the (V72) S/C Signal 2 circuit and the (V937) S/C Switch Ground circuit at the C5 Steering Control Module (SCM) connector, not at the harness connector.

With a scan tool, read the (V72) S/C Signal 2 voltage.

NOTE: The (V72) S/C Signal 2 voltage should be below.2 volts with the jumper wire in place.

Are the Speed Control voltages displayed as described?

Yes
1. Replace the Clockspring in accordance with the Service Information.
2. Perform PCM VERIFICATION TEST .
No
1. Go to step 4).
4) STEERING CONTROL MODULE (SCM)

Fig 2: Connecting Jumper Wire Between S/C Signal 2 Circuit And S/C Switch Ground Circuit In SCM C2 Harness Connector
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the C2 Steering Control Module (SCM) harness connector.

Turn the ignition on.

With a scan tool, read the (V72) S/C Signal 2 voltage.

NOTE: The voltage should be above 4.8 volts with the connector disconnected.

Connect a jumper wire between the (V72) S/C Signal 2 circuit and the (V937) S/C Switch Ground circuit in the C2 Steering Control Module (SCM) harness connector.

With a scan tool, read the (V72) S/C Signal 2 voltage.

NOTE: The (V72) S/C Signal 2 voltage should be below.2 volts with the jumper wire in place.

Are the Speed Control voltages displayed as described?

Yes
1. Replace the Steering Control Module (SCM) in accordance with the Service Information.
2. Perform PCM VERIFICATION TEST .
No
1. Go to step 5).
5) (V72) S/C SIGNAL 2 CIRCUIT SHORTED TO VOLTAGE

Fig 3: Measuring Voltage Of (V72) S/C Signal 2 Circuit In The Steering Control Module (SCM) Harness Connector
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the C3 Powertrain Control Module (PCM) harness connector.

Turn the ignition on.

Measure the voltage of the (V72) S/C Signal 2 circuit in the C2 Steering Control Module (SCM) harness connector.

Is there any voltage present?

Yes
1. Repair the short to voltage in the (V72) S/C Signal 2 circuit.
2. Perform PCM VERIFICATION TEST .
No
1. Go to step 6).
6) (V72) S/C SIGNAL 2 CIRCUIT SHORTED TO GROUND

Fig 4: Measuring Resistance Between Ground And (V72) S/C Signal 2 Circuit In The Steering Control Module (SCM) Harness Connector
Courtesy of CHRYSLER LLC

Turn the ignition off.

Measure the resistance between ground and the (V72) S/C Signal 2 circuit in the C2 Steering Control Module (SCM) harness connector.

Is the resistance above 100 ohms?

Yes
1. Go to step 7).
No
1. Repair the short to ground in the (V72) S/C Signal 2 circuit.
2. Perform PCM VERIFICATION TEST .
7) (V72) S/C SIGNAL 2 CIRCUIT SHORTED TO THE (V937) S/C SWITCH GROUND CIRCUIT

Fig 5: Measuring Resistance Between (V72) S/C Signal 2 Circuit And (V937) S/C Switch Ground Circuit In The Steering Control Module (SCM) Harness Connector
Courtesy of CHRYSLER LLC

Measure the resistance between the (V72) S/C Signal 2 circuit and the (V937) S/C Switch Ground circuit in the C2 Steering Control Module (SCM) harness connector.

Is the resistance above 100 ohms?

Yes
1. Go to step 8).
No
1. Repair the short between the (V72) S/C Signal 2 circuit and the (V937) S/C Switch Ground circuit.
2. Perform PCM VERIFICATION TEST .
8) (V72) S/C SIGNAL 2 CIRCUIT OPEN OR HIGH RESISTANCE

Fig 6: Measuring Resistance Of S/C Signal Circuits
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 Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (V72) S/C Signal 2 circuit between the S/C Switch harness connector and the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes
1. Go to step 9).
No
1. Repair the open or high resistance in the (V72) S/C Signal 2 circuit.
2. Perform PCM VERIFICATION TEST .
9) (V937) S/C SWITCH GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Fig 7: Checking S/C Switch Ground Circuit Open Or High Resistance
Courtesy of CHRYSLER LLC

Measure the resistance of the (V937) S/C Switch Ground circuit between the S/C Switch harness connector and the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes
1. Go to step 10).
No
1. Repair the open or high resistance in the (V937) S/C Switch Ground circuit.
2. Perform PCM VERIFICATION TEST .
10) POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Speed Control Switch and the Powertrain Control Module (PCM).

Look for any chafed, pierced, pinched, or partially broken wires.

Verify that there is good pin to terminal contact in the Switch and Powertrain Control Module connectors.

Look for broken, bent, pushed out or corroded terminals.

Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes
1. Repair as necessary.
2. Perform PCM VERIFICATION TEST .
No
1. Replace the Powertrain Control Module (PCM) in accordance with the Service Information.
2. Perform PCM VERIFICATION TEST .