Dodge Caliber. Manual — part 980
8.
(V72) S/C SWITCH 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Engine Control Module (ECM) harness connector.
Remove the Main Relay.
Connect a jumper wire between cavity B7 and cavity B9 of the Main
Relay connector.
Turn the ignition on.
Measure the voltage of the (V72) S/C Switch 2 Signal circuit.
Is there any voltage present?
Yes
>> Repair the (V72) S/C Switch 2 Signal circuit for a short to
voltage.
Perform the ECM Verification Test Ver.1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
No
>> Go to 9
9.
ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Speed Control
Switch and the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform the ECM Verification Test Ver.1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Replace the Engine Control Module (ECM) in accordance with the Service Information.
Perform the ECM Verification Test Ver.1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
PM
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1207
P0591-SPEED CONTROL SWITCH 2 PERFORMANCE
For a complete wiring diagram Refer to Section 8W
9 - 1208
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
PM
•
When Monitored:
With the ignition on.
•
Set Condition:
The S/C Switch #2 Signal voltage is not within a valid switch signal window for 3.0 seconds.
Possible Causes
INTERMITTENT DTC
(V72) S/C SWITCH 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE
(V937) S/C SWITCH GROUND CIRCUIT SHORTED TO VOLTAGE
(V72) S/C SWITCH 2 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
(V937) S/C SWITCH GROUND CIRCUIT OPEN OR HIGH RESISTANCE
(V72) S/C SWITCH 2 SIGNAL CIRCUIT SHORTED TO GROUND
SPEED CONTROL SWITCH
ENGINE CONTROL MODULE (ECM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
S/C SWITCH VOLTAGES OUT OF RANGE
KEY
SIGNAL 1
SIGNAL 2
LO LIMIT
HI LIMIT
LO LIMIT
HI LIMIT
RELEASED
4.36
4.69
4.36
4.69
ON-OFF
0.50
1.10
3.53
3.90
SET
3.16
3.53
1.56
1.18
RESUME-ACCEL
3.84
4.19
1.70
2.43
CANCEL
1.59
1.97
2.43
3.22
Turn the ignition on.
With the scan tool, monitor the S/C Switch signal voltages.
Press each button while noting the voltage readings for each circuit.
Are the S/C Switch voltages within the ranges specified in the table when each button is pressed?
Yes
>>
Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
No
>> Go To 2
PM
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1209
2.
(V72) S/C SWITCH 2 SIGNAL CIRCUIT VOLTAGE
Turn the ignition off.
Disconnect the Speed Control Switch harness connector.
Turn the ignition on.
Measure the voltage of the (V72) S/C Switch 2 Signal Circuit at the
Speed Control Switch.
Select the appropriate voltage reading.
4.5 to 5.5 volts
Go To 3
Below 4.5 volts
Go To 6
Above 5.5 volts
Go To 8
3.
(V937) S/C SWITCH GROUND CIRCUIT OPEN CIRCUIT OR HIGH RESISTANCE
Turn the ignition off.
Disconnect the Engine Control Module (ECM) harness connector.
Measure the resistance of the (V937) S/C Switch Ground circuit
between the Speed Control Switch harness connector and the Engine
Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms for both circuits?
Yes
>> Go To 4
No
>> Repair the (V937) S/C Switch Ground circuit for an open
circuit or high resistance.
Perform the ECM Verification Test Ver.1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
9 - 1210
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
PM
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