Dodge Ram Truck 1500-2500-3500. Manual — part 1096

P0532-A/C SENDING UNIT VOLTS TOO LOW (CONTINUED)

8.

(C918) SIGNAL CIRCUIT SHORTED TO GROUND

Measure the resistance between the (C918) signal circuit in the sensor
harness connector and battery negative.

Is the resistance greater than 100k Ohms?

Yes

>> Go To 9

No

>> Repair the (C918) signal circuit shorted to ground.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

9.

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Measure the resistance between the (F855) 5-volt supply circuit in the
sensor harness connector and battery negative.

Is the resistance greater than 100k Ohms?

Yes

>> Go To 10

No

>> Repair the (F855) 5-volt supply circuit shorted to ground.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

9 - 1306

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0532-A/C SENDING UNIT VOLTS TOO LOW (CONTINUED)

10.

ECM

Reconnect the ECM harness connectors.

Turn the ignition on.

While monitoring scan tool, use a jumper wire to connect the (F855)
5-volt supply circuit with the (C918) signal circuit at the sensor harness
connector.

Did DTC P0533 set?

Yes

>> Test Complete.

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)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1307

P0533-A/C SENDING UNIT VOLTS TOO HIGH

9 - 1308

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0533-A/C SENDING UNIT VOLTS TOO HIGH (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 is above a calibrated threshold for a certain period of time.

Possible Causes

OTHER DTC’S

A/C PRESSURE SENSOR

(C918) SIGNAL CIRCUIT SHORTED TO BATTERY POSITIVE

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY POSITIVE

(K916) RETURN CIRCUIT OPEN FROM ECM HARNESS CONNECTOR TO A/C HARNESS CONNECTOR

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

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1309