Dodge Ram Truck 1500-2500-3500. Manual — part 1113
P0647-HIGH VOLTAGE DETECTED AT THE A/C CLUTCH RELAY (CONTINUED)
3.
FUSED BATTERY SUPPLY
Ignition off.
Disconnect the ECM connectors.
Remove the A/C clutch relay.
NOTE: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Measure the voltage on the Fused Battery Supply circuit between the PDC and battery negative.
Is the voltage less than 1 volt?
Yes
>> Go To 4
No
>> Repair the short to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
4.
A/C CLUTCH RELAY
Remove the A/C Clutch Relay from the PDC.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between terminals 85 and 86 of the A/C
Clutch Relay.
Is the resistance less than 10 Ohms?
Yes
>> Go To 5
No
>> Replace the A/C clutch relay.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
5.
ECM
Reconnect the ECM harness connectors.
Reinstall the A/C clutch relay.
With the scan tool, actuate the A/C clutch relay.
Turn the ignition on.
While monitoring with the scan tool, disconnect the A/C Clutch Relay from the PDC.
Did DTC P0646 set?
Yes
>> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
No
>> Replace the ECM.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
9 - 1374
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0652-LOW VOLTAGE AT THE #1 SENSOR SUPPLY CIRCUIT
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1375
P0652-LOW VOLTAGE AT THE #1 SENSOR SUPPLY CIRCUIT (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the key on.
•
Set Condition:
Voltage detected on the sensor supply is below a calibrated value.
Possible Causes
ECM
(F855) #1 5-VOLT SUPPLY SHORTED TO GROUND
(F855) #1 5-VOLT SUPPLY SHORTED
FUEL RAIL PRESSURE
A/C PRESSURE SENSOR
MAP SENSOR
CAMSHAFT POSITION SENSOR
INTERMITTENT CONDITION
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
ECM
Turn the ignition off.
Disconnect the ECM 60 pin harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage between the Sensor (F855) #1 5-volt Supply and
the Sensor (K916) #1 Return pin at the ECM.
Is the voltage between 4.5 and 5.5 volts?
Yes
>> Go To 2
No
>> Replace and program the ECM in accordance with the
Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
9 - 1376
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0652-LOW VOLTAGE AT THE #1 SENSOR SUPPLY CIRCUIT (CONTINUED)
2.
(F855) #1 5-VOLT SUPPLY SHORTED TO GROUND
Disconnect the Pressure sensors harness connectors and the engine
position sensor.
Measure the resistance between the (F855) #1 sensor supply circuits
at the ECM harness connector and battery negative.
Is the resistance greater than 100K Ohms?
Yes
>> Go To 3
No
>> Repair the harness.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
3.
FUEL RAIL PRESSURE
Reconnect the ECM harness connector.
While monitoring with the scan tool, disconnect the fuel rail pressure sensor.
Is DTC P0652 set?
Yes
>> Go To 4
No
>> Replace the Fuel rail pressure sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
4.
A/C PRESSURE SENSOR
While monitoring with the scan tool, disconnect the A/C pressure sensor.
Is DTC P0652 set?
Yes
>> Go To 5
No
>> Replace the A/C pressure sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1377
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