Dodge Ram Truck 1500-2500-3500. Manual — part 1095
P0532-A/C SENDING UNIT VOLTS TOO LOW (CONTINUED)
For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on and battery voltage greater than 10.4 volts.
•
Set Condition:
The circuit voltage to the ECM falls below a calibrated threshold for a certain period of time.
Possible Causes
OTHER DTC’S
A/C PRESSURE SENSOR
(C918) SIGNAL CIRCUIT SHORTED TO (K55) RETURN CIRCUIT
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO (K55) RETURN CIRCUIT
(C918) SIGNAL CIRCUIT OPEN FROM ECM HARNESS CONNECTOR TO A/C HARNESS CONNECTOR
(F855) 5-VOLT SUPPLY CIRCUIT OPEN FROM ECM HARNESS TO A/C HARNESS CONNECTORS
(C918) SIGNAL CIRCUIT SHORTED TO GROUND
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
ECM
INTERMITTENT CONDITION
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
OTHER DTC’S
Turn the ignition on.
With the scan tool, read DTCs.
Are other DTC’s present?
Yes
>> Repair other DTC’s first.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
No
>> Go To 2
9 - 1302
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0532-A/C SENDING UNIT VOLTS TOO LOW (CONTINUED)
2.
HARNESS OPEN
Disconnect the A/C pressure sending unit harness connector.
Check connectors - Clean/repair as necessary.
Measure the voltage between the (F855) 5-volt supply and (K916)
return circuits of the sensor harness connector.
Is the voltage between 4.5 and 5.5 volts?
Yes
>> Go To 3
No
>> Go To 4
3.
A/C PRESSURE SENSOR
While monitoring scan tool, use a jumper wire to connect the (F855)
5-volt supply circuit to the (C918) signal circuit at the sensor harness
connector.
Did P0533 set?
Yes
>> Replace the A/C pressure sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
No
>> Go To 4
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1303
P0532-A/C SENDING UNIT VOLTS TOO LOW (CONTINUED)
4.
(C918) SIGNAL CIRCUIT SHORTED TO THE (K916) RETURN CIRCUIT
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance between the (C918) signal circuit and (K916)
return circuit in the sensor harness connector.
Is the resistance greater than 100k Ohms?
Yes
>> Go To 5
No
>> Repair the (C918) signal circuit shorted to the (K916)
return circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
5.
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K916) RETURN CIRCUIT
Measure the resistance between the (F855) 5-volt supply circuit and
(K916) return circuit in the sensor harness connector.
Is the resistance greater than 100k Ohms?
Yes
>> Go To 6
No
>> Repair the (F855) 5-volt supply circuit shorted to the
(K916) return circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
9 - 1304
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0532-A/C SENDING UNIT VOLTS TOO LOW (CONTINUED)
6.
(C918) SIGNAL CIRCUIT OPEN FROM ECM HARNESS CONNECTOR TO A/C HARNESS CONNECTOR
Measure the resistance of the (C918) signal circuit between the sensor
harness connector and the ECM harness connector.
Is the resistance less than 10 Ohms?
Yes
>> Go To 7
No
>> Repair the open (C918) signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
7.
(F855) 5-VOLT SUPPLY CIRCUIT OPEN FROM ECM HARNESS
CONNECTOR TO A/C HARNESS CONN
Measure the resistance of the (F855) 5-volt supply circuit between the
sensor harness connector and the ECM harness connector.
Is the resistance less than 10 Ohms?
Yes
>> Go To 8
No
>> Repair the open (F855) 5-volt supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1305
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