2006 DODGE RAM SRT-10 sensor

P1493-AMBIENT/BATTERY TEMPERATURE SENSOR VOLTAGE TOO LOW
For a complete wiring diagramRefer to Section 8W.

When Monitored:
With the ignition on.
Set Condition:
The PCM senses the voltage from the Battery Temperature Sensor below 0.5 ofa volt for 3 seconds.
Possible Causes
BATTERY TEMP SENSOR VOLTAGE BELOW 0.5 OF A VOLT
BATTERY TEMPERATURE SENSOR
(K25) BATTERY TEMP SIGNAL CIRCUIT SHORTED TO GROUND
(K25) BATTERY TEMP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
1.BATTERY TEMP SENSOR VOLTAGE BELOW 0.5 OF A VOLT
Ignition on, engine not running.
Record all DTCs and the related Freeze Frame data.
With scan tool, monitor the Ambient/Battery Temperature Sensor voltage.
Is the voltage below 0.5 of a volt?
Ye s>>
Go To 2
No>>
Refer to the INTERMITTENT CONDITIONSymptom (Diagnostic Procedure).
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.BATTERY TEMPERATURE SENSOR
Ignition on, engine not running.
With the scan tool in sensors, read the Battery Temp Sensor voltage.
Disconnect the Battery Temp Sensor harness connector.
Did the Battery Temperature Sensor voltage change from below 1.0 volt to above 4.5 volts?
Ye s>>
Replace the Battery Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 3
3.(K25) BATTERY TEMP SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the (K25) Battery Temp
Signal circuit at the Battery Temp Sensor harness connector.
Istheresistancebelow100ohms?
Ye s>>
Repair the short to ground in the (K25) Batt Temp Signal
circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
No>>
Go To 4

4.(K25) BATTERY TEMP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND
Measure the resistance between the (K25) Battery Temp Signal circuit
and the (K900) Sensor ground circuit at the Battery Temp Sensor har-
ness connector.
Istheresistancebelow100ohms?
Ye s>>
Repair the short between the (K900) Sensor ground circuit
and the (K25) Batt Temp Signal circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 -
ENGINE - STANDARD PROCEDURE)
No>>
Go To 5
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 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)

P1598-A/C PRESSURE SENSOR VOLTAGE TOO HIGH
For a complete wiring diagramRefer to Section 8W.

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.

3.(C918) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (C918) A/C Pressure Signal circuit in the
A/C Pressure Sensor harness connector.
Is the voltage above 5.2 volts?
Ye s>>
Repair the short to voltage in the (C918) A/C Pressure Sig-
nal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 4
4.(C918) A/C PRESSURE SIGNAL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (C918) A/C Pressure Signal circuit
between the A/C Pressure Sensor harness connector and the PCM har-
ness connector.
Is the resistance below 5.0 ohms?
Ye s>>
Go To 5
No>>
Repair the open in the (C918) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)