Diagnostic Instructions

DTC Descriptor

DTC P052E 00: Positive Crankcase Ventilation Heater Control Circuit Performance

DTC P053A 00: Positive Crankcase Ventilation Heater Control Circuit Open

DTC P053B 00: Positive Crankcase Ventilation Heater Control Circuit Low Voltage

DTC P053C 00: Positive Crankcase Ventilation Heater Control Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition	P053A 00	P053A 00	--	--
Output Control	P053B 00	P053A 00	P053C 00	P052E 00

Circuit/System Description

The positive crank case ventilation heater is controled by the ECM. Ignition voltage is directly supplied to the positive crank case ventilation heater and the ECM a controled ground circuit.

Conditions for Running the DTC

Conditions for Setting the DTC

P052E

The ECM detects an over temperature at the output powerstage when the positive crank case ventilation heater is commanded ON.

P053A

The ECM detects an open circuit when the positive crank case ventilation heater is commanded ON.

P053B

The ECM detects a short to ground when the positive crank case ventilation heater is commanded ON.

P053C

The ECM detects a short to voltage when the positive crank case ventilation heater is commanded ON.

Action Taken When the DTC Sets

DTCs P052E, P053A, P053B and P053C are Type A DTCs.

Conditions for Clearing the DTC

DTCs P052E, P053A, P053B and P053C are Type A DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, command the Crank Case Ventilation Heater ON and OFF with a scan tool. feel the XXX Positive Crank Case Ventilation Heater heats up.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the XXX Positive Crank Case Ventilation Heater.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal X and ground.

⇒	If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the K20 Engine Control Module (ECM).

3. Connect a test lamp between the ignition circuit terminal X and the control circuit terminal Y.
4. Command the Crank Case Ventilation Heater OFF with a scan tool. The test lamp should be OFF.

⇒	If the test lamp does illuminate, test the control circuit for a short to ground. If the circuits test normal, replace the K20 Engine Control Module (ECM).

5. Command the Crank Case Ventilation Heater ON with a scan tool. The test lamp should be ON.

⇒	If the test lamp does not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

6. If all circuits test normal, test or replace the XXX Positive Crank Case Ventilation Heater.

Component Testing

Static Test

1. Ignition OFF, disconnect the harness connector at the XXX Positive Crank Case Ventilation Heater.
2. Test for 0.6-1.2 Ω between the control terminal Y and the ignition terminal X of the XXX Positive Crank Case Ventilation Heater.

⇒	If not within the specified range, replace the XXX Positive Crank Case Ventilation Heater.

3. Test for infinite resistance between each terminal and the XXX Positive Crank Case Ventilation Heater housing.

⇒	If not the specified value, replace the XXX Positive Crank Case Ventilation Heater.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.