Dodge Caliber. Manual — part 801
P0579-SPEED CONTROL SWITCH 1 PERFORMANCE
For a complete wiring diagram Refer to Section 8W
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ENGINE ELECTRICAL DIAGNOSTICS - GPEC
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•
When Monitored:
With the ignition on and battery voltage greater than 10.4 volts.
•
Set Condition:
The ECM detects that the Speed Control signal voltage is implausible.
Possible Causes
INTERMITTENT DTC
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO VOLTAGE
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO GROUND
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO THE (V937) S/C SWITCH GROUND CIRCUIT
(V71) S/C SIGNAL 1 CIRCUIT OPEN OR HIGH RESISTANCE
(V937) S/C SWITCH GROUND CIRCUIT OPEN OR HIGH RESISTANCE
CLOCKSPRING
SPEED CONTROL SWITCH
STEERING CONTROL MODULE (SCM)
POWERTRAIN CONTROL MODULE (PCM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
DTC IS ACTIVE
Turn the ignition on.
With a scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
>> Go to 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
SPEED CONTROL SWITCH
Turn the ignition off.
Remove the Speed Control Switch in accordance with the Service Infor-
mation.
Turn the ignition on.
With a scan tool, read the (V71) S/C Signal 1 voltage.
NOTE: The (V71) S/C Signal 1 voltage should be above 4.8 volts
with the Speed Control Switch removed.
Connect a jumper wire between the (V71) S/C Signal 1 circuit and the
(V937) S/C Switch Ground circuit in the Speed Control Switch harness
connector.
With a scan tool, read the (V71) S/C Signal 1 voltage.
NOTE: The (V71) S/C Signal 1 voltage should be below .2 volts
with the jumper wire in place.
Is the (V71) S/C Signal 1 voltage above 4.8 volts with the Speed Control Switch removed and below .2
volts with the jumper wire in place?
Yes
>> Replace the Speed Control Switch in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 3
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ENGINE ELECTRICAL DIAGNOSTICS - GPEC
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3.
CLOCKSPRING
Turn the ignition off.
Disconnect the Steering Control Module (SCM) C5 harness connector.
Turn the ignition on.
With a scan tool, read the (V71) S/C Signal 1 voltage.
NOTE: The voltage should be above 4.8 volts with the Steering Control Module (SCM) C5 connector dis-
connected.
Connect a jumper wire between the (V71) S/C Signal 1 circuit and the (V937) S/C Switch Ground circuit at the
Steering Control Module (SCM) C5 connector, not at the harness connector.
With a scan tool, read the (V71) S/C Signal 1 voltage.
NOTE: The (V71) S/C Signal 1 voltage should be below .2 volts with the jumper wire in place.
Are the Speed Control voltages displayed as described?
Yes
>> Replace the Clockspring in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 4
4.
STEERING CONTROL MODULE (SCM)
Turn the ignition off.
Disconnect the Steering Control Module (SCM) C2 connector.
Turn the ignition on.
With a scan tool, read the (V71) S/C Signal 1 voltage.
NOTE: The voltage should be above 4.8 volts with the connector
disconnected.
Connect a jumper wire between the (V71) S/C Signal 1 circuit and the
(V937) S/C Switch Ground circuit in the Steering Control Module (SCM)
C2 harness connector.
With a scan tool, read the (V71) S/C Signal 1 voltage.
NOTE: The (V71) S/C Signal 1 voltage should be below .2 volts
with the jumper wire in place.
Are the Speed Control voltages displayed as described?
Yes
>> Replace the Steering Control Module (SCM) in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 5
5.
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Powertrain Control Module (PCM) connector.
Turn the ignition on.
Measure the voltage of the (V71) S/C Signal 1 circuit in the Steering
Control Module (SCM) harness connector.
Is there any voltage present?
Yes
>> Repair the (V71) S/C Signal 1 circuit for a short to voltage.
Perform the PCM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go to 6
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ENGINE ELECTRICAL DIAGNOSTICS - GPEC
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6.
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Measure the resistance between ground and the (V71) S/C Signal 1 cir-
cuit in the Steering Control Module (SCM) harness connector.
Is the resistance above 100 ohms?
Yes
>> Go to 7
No
>> Repair the (V71) S/C Signal 1 circuit for a short to ground.
Perform the PCM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
7.
(V71) S/C SIGNAL 1 CIRCUIT SHORTED TO THE (V937) S/C SWITCH GROUND CIRCUIT
Measure the resistance between the (V71) S/C Signal 1 circuit and the
(V937) S/C Switch Ground circuit in the Steering Control Module (SCM)
harness connector.
Is the resistance above 100 ohms?
Yes
>> Go to 8
No
>> Repair the (V71) S/C Signal 1 circuit for a short to the
Steering Control Module (SCM) circuit.
Perform the PCM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
8.
(V71) S/C SIGNAL 1 CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the (V71) S/C Signal 1 circuit between the
Steering Control Module (SCM) harness connector and the Powertrain
Control Module (PCM) harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go to 9
No
>> Repair the (V71) S/C Signal 1 circuit for an open circuit or
high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
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ENGINE ELECTRICAL DIAGNOSTICS - GPEC
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