For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### 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

• | The ignition is ON, or the engine is running.

• | The DTCs run continuously when the above conditions are met.

### 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

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### 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.

• | LINK

• | Engine Control Module Replacement for ECM replacement, setup, and programming