ignition DODGE RAM SRT-10 2006 Service Repair Manual

5.(K107) LDP SWITCH SENSE CIRCUIT OPEN
Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance of the (K107) LDP Switch Sense circuit from the
PCM harness connector to LDP harness connector.
Is the resistance below 5.0 ohms?
Ye s>>
Go To 6
No>>
Repair the open in the (K107) Leak Detection Pump Switch
Sense circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
6.(K107) LDP SWITCH SENSE CIRCUIT SHORT TO GROUND
Measure the resistance between ground and the (K107) LDP Switch
Sense circuit.
Istheresistancebelow100ohms?
Ye s>>
Repair the short to ground in the (K107) LDP Switch Sense
circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
No>>
Go To 7
7.PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
If there are no possible causes remaining, view repair.
Repair
Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

When Monitored:
Continuously when the ignition is on and battery voltage is greater than 10.4 volts.
Set Condition:
The state of the solenoid circuit does not match the PCM’s desired state.
Possible Causes
(K125) GENERATOR SOURCE CIRCUIT OPEN
(K107) LDP SWITCH SIGNAL CIRCUIT OPEN
(K107) LDP SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
(K106) LEAK DETECTION PUMP SOLENOID CONTROL CIRCUIT OPEN
(K106) LDP SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
LEAK DETECTION PUMP
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
Ignition on, engine not running.
With a scan tool, read DTCs and record the related Freeze Frame data if any DTC(s) are present.
Whether or not any DTC(s) are present you will want to check the following items which may assist in repairing the
customer’s complaint successfully.
Check the vehicles repair history.
If the vehicle has a repair history that pertains to the customer’s currentcomplaint, review the repair.
Inspect the vehicle for any aftermarket accessories that may have been installed incorrectly.
Check for any service bulletin(s) related to the customer’s complaint or DTC(s).
If a service bulletin applies, follow the instructions per the service bulletin.
Choose the following scenario that best applies.
The service bulletin repaired the customer’s complaint.
Testing complete.
A DTC is present, no service bulletins apply, or the service bulletin didn’t repair the customer’s complaint.
Go To 2
2.GOOD TRIP EQUAL TO ZERO
Ignition on, engine not running.
With the scan tool, read DTCs.
Is the Good Trip Counter displayed and equal to zero?
Ye s>>
Go To 3
No>>
Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

3.(K125) GENERATOR SOURCE CIRCUIT OPEN
Turn the ignition off.
Disconnect the Leak Detection Pump electrical harness connector.
Ignition on, engine not running.
With the scan tool, actuate the Leak Detection Pump.
Using a 12-volt test light connected to ground, check the (K125) Gen-
erator Source circuit at the LDP connector.
Does the test light illuminate brightly?
Ye s>>
Go To 4
No>>
Repair the open in the (K125) Generator Source circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
4.LDP SOLENOID CONTROL OPERATION
Turn the ignition off.
Connect a 12-volt test light to a good 12-volt source.
Ignition on, engine not running.
With the scan tool, actuate the Leak Detection Pump.
Probe the (K106) LDP Solenoid Control circuit with the test light while
the Pump is actuating.
Does the test light blink?
Ye s>>
Go To 5
No>>
Go To 8

5.(K107) LDP SWITCH SIGNAL CIRCUIT OPEN
Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance of the (K107) LDP Switch Signal circuit from the
PCM harness connector to LDP harness connector.
Is the resistance below 5.0 ohms?
Ye s>>
Go To 6
No>>
Repair the open in the (K107) Leak Detection Pump Switch
Signal circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
6.(K107) LDP SWITCH SIGNAL CIRCUIT SHORT TO GROUND
Measure the resistance between ground and the (K107) LDP Switch
Signal circuit at the LDP harness connector.
Istheresistancebelow100ohms?
Ye s>>
Repair the short to ground in the (K107) LDP Switch Signal
circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
No>>
Go To 7
7.LEAK DETECTION PUMP
If there are no possible causes remaining, view repair.
Repair
Replace the Leak Detection Pump.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

8.(K106) LEAK DETECTION PUMP SOLENOID CONTROL CIRCUIT OPEN
Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance of the (K106) LDP Solenoid Control circuit from
the PCM harness connector to the LDP harness connector.
Is the resistance below 5.0 ohms?
Ye s>>
Go To 9
No>>
Repair the open in the (K106) Leak Detection Pump Sole-
noid Control circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
9.(K106) LDP SOLENOID CONTROL CIRCUIT SHORT TO GROUND
Measure the resistance between ground and the (K106) LDP Solenoid
Control circuit.
Istheresistancebelow100ohms?
Ye s>>
Repair the short to ground in the (K106) LDP Solenoid Con-
trol circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
No>>
Go To 10
10.PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
If there are no possible causes remaining, view repair.
Repair
Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

When Monitored:
Ignition on and engine running.
Set Condition:
An open or shorted condition in the Hydraulic Fan Solenoid control circuitis detected by the Powertrain Control
Module.
Possible Causes
RADIATOR FAN INOP
(K342) FUSED ASD RELAY OUTPUT CIRCUIT
(C240) COOLING FAN CONTROL CIRCUIT OPEN
(C240) COOLING FAN CONTROL CIRCUIT SHORTED TO GROUND
HYDRAULIC FAN
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
1.RADIATOR FAN INOP
Ignition on, engine not running.
With the scan tool, perform the Hydraulic Fan Solenoid Test found under Engine Test and Systems Test.
Does the Radiator Fan operate properly?
Ye s>>
Refer to the INTERMITTENT CONDITIONSymptom (Diagnostic Procedure).
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 2
2.(K342) FUSED ASD RELAY OUTPUT CIRCUIT
Turn the ignition off.
Disconnect the Fan Solenoid harness connector.
Ignition on, engine not running.
With the scan tool, actuate the ASD Relay.
Using a 12-volt test light connect to ground, probe the (K342) Fused
ASD Relay Output circuit at the fan solenoid.
Does the test light illuminate brightly when the ASD Relay is
actuated?
Ye s>>
Go To 3
No>>
Repair the open or short to ground in the (K342) Fused
ASD Relay Output circuit. Inspect the related fuse and
repair as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

3.(C240) COOLING FAN SOLENOID CIRCUIT OPEN
Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance of the (C240) Cooling Fan Solenoid Control cir-
cuit from the fan harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
Ye s>>
Go To 4
No>>
Repair the open in the (C240) Cooling Fan Control circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
4.(C240) COOLING FAN CONTROL CIRCUIT SHORT TO GROUND
Measure the resistance between ground and the (C240) Cooling Fan
Control circuit.
Istheresistancebelow100ohms?
Ye s>>
Repair the short to ground in the (C240) Cooling Fan Con-
trol circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
No>>
Go To 5
5.HYDRAULIC FAN SOLENOID
Remove the ASD Relay and connect a jumper wire between the (K342) ASD Relay Output terminal and the (A14)
Fused B+ circuit to keep the ASD Output circuit powered up for this step.
Connect another jumper wire to the (C240) Hydraulic Fan Solenoid Control circuit in the PCM harness connector.
Momentarily connect the other end of the jumper wire to ground.
NOTE: Remove the jumper wires before continuing.
Did the solenoid actuate?
Ye s>>
Go To 6
No>>
Replace the Hydraulid Radiator Fan.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

When Monitored:
With the ignition key on and the engine speed greater than 0 RPM.
Set Condition:
When the PCM regulates the generator field and there are no detected field problems, but the voltage output
does not decrease.
Possible Causes
(K20) GENERATOR FIELD CONTROL CIRCUIT SHORTED TO GROUND
GENERATOR FIELD COIL SHORTED TO GROUND
BATTERY TEMPERATURE SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.CHARGING SYSTEM OPERATION
NOTE: Battery must be fully charged and be capable of passing a load test.
NOTE: Generator Belt tension and condition must be checked before continuing.
Ignition on, engine not running.
With the scan tool, read DTCs and the related Freeze Frame data then clear theDTCs.
With scan tool, actuate the Generator Field Driver.
With a 12-volt test light connected to ground, backprobe the (K20) Gen Field Control circuit in the back of Generator
Field harness connector.
Does the test light illuminate brightly and flash?
Ye s>>
Go To 2
No>>
Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.(K20) GEN FIELD CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Disconnect the Generator Field Harness connector.
Carefully inspect the related connectors for corrosion or spread termi-
nals before continuing.
Measure the resistance between ground and the (K20) Generator Field
Driver circuit at the Generator Field harness connector.
Istheresistancebelow100ohms?
Ye s>>
Repair the short to ground in the (K20) Generator Field
Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 3

3.GENERATOR FIELD COIL SHORTED TO GROUND
Measure the resistance between ground and the Generator Field terminals on the Generator.
Istheresistancebelow100ohms?
Ye s>>
Replace or repair the Generator Field Coil for a short to ground.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 4
4.BATTERY TEMPERATURE SENSOR
Connect the PCM harness connectors and the Generator harness connector.
Ignition on, engine not running.
With the scan tool in Inputs/Outputs, read the Batt Temp Sensor value.
Using a thermometer measure under hood temperature near Battery tray.
Is the temperature within 10 deg of Battery temperature?
Ye s>>
Go To 5
No>>
Replace the Battery Temperature Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5.PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
If there are no possible causes remaining, view repair.
Repair
Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

When Monitored:
With the engine running and the A/C Relay energized.
Set Condition:
The A/C Pressure Sensor Signal at the PCM goes above 4.92 volts.
Possible Causes
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO VOLTAGE
(C18) A/C PRESSURE SIGNAL CIRCUIT OPEN
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT
(K900) SENSOR GROUND CIRCUIT OPEN
A/C PRESSURE SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.A/C PRESSURE SENSOR VOLTAGE ABOVE 4.9 VOLTS
NOTE: Make sure the A/C refrigerant System is properly charged per the Service Information.
Ignition on, engine not running.
With the scan tool, read DTCs and record the related Freeze Frame data.
Start the engine.
With the scan tool, read the A/C Pressure Sensor voltage.
Is the voltage above 4.9 volts?
Ye s>>
Go To 2
No>>
Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.A/C PRESSURE SENSOR
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Connect a jumper wire between the (C918) A/C Pressure Signal circuit
and the (K900) Sensor ground circuit in the Sensor harness connector.
With the scan tool, monitor the A/C Pressure Sensor voltage.
Ignition on, engine not running.
Is the voltage below 1.0 volt?
Ye s>>
Replace the A/C Pressure Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 3
NOTE: Remove the jumper wire before continuing.