2006 DODGE RAM SRT-10 service

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.

5.(C918) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT
Measure the resistance between the (C918) A/C Pressure Signal circuit
and the (F855) 5-volt Supply circuit in the A/C Pressure Sensor harness
connector.
Is the resistance below 5.0 ohms?
Ye s>>
Repair the short between the (F855) 5-volt Supply circuit
and the (C918) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 6
6.(K900) SENSOR GROUND CIRCUIT OPEN
Measure the resistance of the (K900) Sensor ground circuit from the
A/C Pressure Sensor harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
Ye s>>
Go To 7
No>>
Repair the open in the (K900) Sensor ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
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 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 Transducer Signal voltage at the PCM goes below 0.58 voltsfor 2.6 seconds.
Possible Causes
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
A/C PRESSURE SENSOR
(C918) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND
(C918) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.A/C PRESSURE SENSORr VOLTAGE BELOW 0.6 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 Transducer voltage.
Is the voltage below 0.60 of a volt?
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.(F855) 5-VOLT SUPPLY CIRCUIT
Turn the ignition off.
Disconnect the A/C Pressure Transducer harness connector.
Ignition on, engine not running.
Measure the voltage on the (F855) 5-volt Supply circuit in the A/C Pres-
sure Transducer harness connector.
Is the voltage between 4.5 to 5.2 volts?
Ye s>>
Go To 3
No>>
Go To 6

6.(F855) 5-VOLT SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance of the (F855) 5-volt Supply circuit between the
A/C Pressure Transducer harness connector and the PCM harness con-
nector.
Is the resistance below 5.0 ohms?
Ye s>>
Go To 7
No>>
Repair the open in the (F855) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
7.(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between the (F855) 5-volt Supply circuit and
ground in the A/C Pressure Transducer harness connector.
Istheresistancebelow100ohms?
Ye s>>
Repair the short to ground in the (F855) 5-volt Supply cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 8
8.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)

9.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 ignition on.
Set Condition:
The PCM has not received an expected Cluster Status Bus message from the instrument cluster within the last
20 seconds.
Possible Causes
(D25) OPEN BETWEEN PCM AND CLUSTER
(D25) SHORTED BETWEEN PCM AND CLUSTER
CLUSTER
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.NO CLUSTER BUS MESSAGE
Ignition on, engine not running.
With the scan tool, erase DTCs.
Cycle the ignition key on and off several times.
With the scan tool, read DTCs.
Does the DTC reset?
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.COMMUNICATE WITH CLUSTER
Ignition on, engine not running.
With the scan tool, attempt to communicate with the Instrument cluster.
Can communication be established with the Instrument Cluster?
Ye s>>
Go To 3
No>>
Refer to the Communication Category of the Body Diagnostic Manual and perform the appropriate
symptom related to no communication with cluster.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
3.INSTRUMENT CLUSTER OPERATION
Start the engine
Allow the engine to idle.
Is the correct engine speed display in the instrument cluster (Tach)?
Ye s>>
Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Refer to the Instrument Category in the Body Diagnostic Manual and performthe appropriate symptom.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

3.(D25) PCI BUS CIRCUIT OPEN
Turn the ignition off.
Disconnect the C3 PCM harness connector.
Disconnect the FCM harness connector.
NOTE: Inspect the PCI Bus terminal at both the PCM connectors
and the FCM connectors. Check for corrosion, damage or terminal
push out.
Measure the resistance of the (D25) PCI BUS circuit between the C3
PCM harness connector and the FCM harness connector.
Is the resistance below 5.0 ohms?
Ye s>>
Replace and program the Powertrain Control Module per
Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No>>
Repair the open in the (D25) PCI BUS circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)

P1696-PCM FAILURE EEPROM WRITE DENIED
For a complete wiring diagramRefer to Section 8W.
When Monitored:
Ignition on and battery voltage greater than 10 volts.
Set Condition:
An attempt to program/write to the internal EEPROM failed, also checks at powerdown.
Possible Causes
SRI MILEAGE INVALID
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.SCAN TOOL DISPLAYS WRITE FAILURE
Ignition on, engine not running.
With the scan tool, perform the SRI Memory Test.
Does the scan tool display Write Failure?
Ye s>>
Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 2
2.SCAN TOOL DISPLAYS WRITE REFUSED
With the scan tool, perform the SRI Memory Test.
Does the scan tool display Write Refused?
Ye s>>
Go To 3
No>>
Go To 4
3.PCM REFUSED 2ND TEST
With the scan tool, perform the SRI Memory Test a second time.
NOTE: Retest the SRI Memory two more times.
Does the scan tool display Write Refused again?
Ye s>>
Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Te s t C o m p l e t e .
4.SCAN TOOL DISPLAYS SRI MILEAGE INVALID
With the scan tool, perform the SRI Memory Test.
Does the scan tool display SRI Mileage Invalid?
Ye s>>
Update the mileage and retest the SRI Memory.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 5