Dodge Ram Truck 1500-2500-3500. Manual — part 1097
P0533-A/C SENDING UNIT VOLTS TOO HIGH (CONTINUED)
2.
HARNESS OPEN
Turn the ignition off.
Disconnect the A/C pressure sending unit harness connector.
Check connectors - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage between the (F855) 5-volt supply circuit and
(K916) return circuit 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 (K916)
return circuit to the (C918) signal circuit at the sensor harness connec-
tor.
Did P0532 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
9 - 1310
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0533-A/C SENDING UNIT VOLTS TOO HIGH (CONTINUED)
4.
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY NEGATIVE
Turn the ignition off.
Disconnect the ECM harness connectors.
Check connectors - Clean/repair as necessary.
Measure the voltage between the (F855) 5-volt supply circuit at the
harness connector and battery negative.
Is the voltage less than 1 volt?
Yes
>> Go To 5
No
>> Repair the (F855) 5-volt supply circuit shorted to the bat-
tery negative.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
5.
(C918) SIGNAL CIRCUIT SHORTED TO BATTERY NEGATIVE
Measure the voltage between the (C918) signal circuit at the harness
connector and battery negative.
Is the voltage less than 1 volt?
Yes
>> Go To 6
No
>> Repair the (C918) signal circuit shorted to the battery neg-
ative.
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 - 1311
P0533-A/C SENDING UNIT VOLTS TOO HIGH (CONTINUED)
6.
(K916) RETURN CIRCUIT OPEN FROM ECM HARNESS CONNECTOR TO A/C HARNESS CONNECTOR
Measure the resistance of the (K916) return 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 (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)
7.
ECM
Reconnect the ECM harness connectors.
Turn the ignition on.
While monitoring scan tool, use a jumper wire to connect the (K916)
return circuit with the (C918) signal circuit at the sensor harness con-
nector.
Did DTC P0532 set?
Yes
>> Refer to the INTERMITTENT CONDITION Symptom
(Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNO-
SIS AND TESTING)
No
>> Replace the ECM.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
9 - 1312
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0541-LOW VOLTAGE ON THE #1 INTAKE AIR HEATER RELAY
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1313
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