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Electronic Control System Gas Plus Engines – FAULT CODE 466 – L Gas Plus

Turbocharger Control Valve Circuit – Shorted Low

Overview

CODE REASON EFFECT
Fault Code: 466
PID: S32
SPN: 1188
FMI: 4
LAMP: Amber
SRT: 

Turbocharger Control Valve Circuit – Shorted Low. Low voltage (short to ground) detected at the ECM.

Variable geometry turbocharger will go to the open position.

Turbocharger Control Valve Circuit
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Circuit Description

The electronic control module (ECM) controls the variable geometry actuator position with the turbocharger control valve. The turbocharger control valve controls the air pressure to the variable geometry actuator when commanded by the ECM. ECM commands are sent to the control valve through the turbocharger control valve signal of the ECM engine harness.

Component Location

The turbocharger actuator control valve is located near the fuel housing and connected by a tube to the turbocharger actuator.

Shop Talk

This fault code is caused by an electrical problem. A mechanical issue will not cause this fault to log.

Possible causes of this fault code include:

  • Signal short circuit to ground
  • Short circuit to ground in the turbocharger control valve.

Cautions and Warnings

 CAUTION 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.
 CAUTION 

To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead
Part Number 3823993 – male Deutsch test lead.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the fault codes.  
  STEP 1A. Check for an inactive fault code. Fault Code 466 inactive?
STEP 2. Check the variable geometry actuator and circuit.  
  STEP 2A. Inspect the variable geometry turbocharger actuator and connector pins. Dirty or damaged pins?
  STEP 2B. Check for circuit response. Fault Code 465 active and Fault Code 466 inactive?
  STEP 2C. Check the fault codes and verify sensor condition. Fault Code 466 active?
STEP 3. Check the ECM and engine harness.  
  STEP 3A. Inspect the ECM and engine harness connector pins. Dirty or damaged pins?
  STEP 3B. Check for a pin short to ground. Greater than 100k ohms?
  STEP 3C. Check for a pin to pin short circuit in the engine harness(es). Greater than 100k ohms?
  STEP 3D. Check for an inactive fault code. Fault Code 466 inactive?
STEP 4. Clear the fault codes.  
  STEP 4A. Disable the fault code. Fault Code 466 inactive?
  STEP 4B. Clear the inactive fault codes. All fault codes cleared?

Guided Step 1 – Check the fault codes.

Guided Step 1A – Check for an inactive fault code.

Conditions

  • Turn keyswitch ON
  • Connect the INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 466 inactive?
YES NO
No Repair No Repair

Guided Step 2 – Check the variable geometry turbocharger actuator and circuit.

Guided Step 2A – Inspect the variable geometry turbocharger actuator and connector pins.

Conditions

  • Turn keyswitch OFF
  • Disconnect the variable geometry turbocharger actuator from the engine harness.

Action

  • Corroded pins
  • Bent or broken pins
  • Pushed back or expanded pins
  • Wire insulation damage
  • Moisture in or on the connector
  • Missing or damaged connector seals
  • Connector shell broken
  • Dirt or debris in or on the connector pins.

For general inspection techniques, refer to Component Connector and Pin Inspection, Procedure 019-361.

Dirty or damaged pins?
YES NO

A defective connection has been detected in the sensor or harness connector.

Repair the damaged pins. Repair or replace the harness, or replace the valve, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Repair the harness. Refer to Procedure 019-205.
  • Replace the harness. Refer to Procedure 019-043.
  • Replace the valve. Refer to Procedure 019-388.
 No Repair

Guided Step 2B – Check for circuit response.

Conditions

  • Turn keyswitch OFF
  • Disconnect the variable geometry turbocharger actuator from the engine harness
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 465 active and Fault Code 466 inactive?
YES NO
No Repair No Repair

Guided Step 2C – Check the fault codes and verify sensor condition.

Conditions

  • Turn keyswitch OFF
  • Connect all components
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 466 active?
YES NO

A defective turbocharger control valve has been detected.

  • Replace the turbocharger control valve. Refer to Procedure 019-388.
 No Repair

Guided Step 3 – Check the ECM and engine harness.

Guided Step 3A – Inspect the ECM and engine harness connector pins.

Conditions

  • Turn keyswitch OFF
  • Disconnect engine harness connector 1 from the ECM.

Action

  • Corroded pins
  • Bent or broken pins
  • Pushed back or expanded pins
  • Wire insulation damage
  • Moisture in or on the connector
  • Missing or damaged connector seals
  • Connector shell broken
  • Dirt or debris in or on the connector pins.

For general inspection techniques, refer to Component Connector and Pin Inspection, Procedure 019-361.

Dirty or damaged pins?
YES NO

A defective connection has been detected in the ECM or engine harness connector.

Repair the damaged pins. Repair or replace the harness, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Repair the harness. Refer to Procedure 019-205.
  • Replace the harness. Refer to Procedure 019-043.
No Repair

Guided Step 3B – Check for a pin short circuit to ground.

Conditions

  • Turn keyswitch OFF
  • Disconnect the engine harness connector 1 from the ECM
  • Disconnect the variable geometry turbocharger actuator from the engine harness.

Action

  • Measure the resistance between the variable geometry turbocharger actuator SUPPLY pin in the engine harness ECM connector 1 and ground.

Refer to the circuit diagram or wiring diagram for connector pin identification.

For general resistance measurement techniques, refer to the Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360.
SMALL | MEDIUM | LARGE

Greater than 100k ohms?
YES NO
No Repair

An pin to ground short circuit on the variable geometry turbocharger actuator supply line has been detected in the engine harness(es).

Troubleshoot each harness connected in series to determine which contains the shorted supply circuit to ground.

Repair the damaged pins. Repair or replace the harness, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Repair the harness. Refer to Procedure 019-205.
  • Replace the harness. Refer to Procedure 019-043.

Guided Step 3C – Check for a pin to pin short circuit in the engine harness(es).

Conditions

  • Turn keyswitch OFF
  • Disconnect the engine harness connector 1 and connector 2 from the ECM.
  • Disconnect the variable geometry turbocharger actuator from the engine harness.

Action

  • Measure the resistance between the variable geometry turbocharger actuator SUPPLY pin in the engine harness ECM engine connector 1 to all other pins in the ECM connector 1.
  • Measure the resistance from the variable geometry turbocharger actuator SUPPLY pin in the engine harness ECM engine connector 1 to all pins in the ECM connector 2.

Refer to the circuit diagram or wiring diagram for connector pin identification.

For general resistance measurement techniques, refer to the Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360.
SMALL | MEDIUM | LARGE

Greater than 100k ohms?
YES NO
No Repair

An pin to pin short on the variable geometry turbocharger actuator supply line has been detected in the engine harness.

Troubleshoot each harness connected in series to determine which contains the shorted supply circuit to ground.

Repair the damaged pins. Repair or replace the harness(es), whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Repair the harness. Refer to Procedure 019-205.
  • Replace the harness. Refer to Procedure 019-043.

Guided Step 3D – Check for an inactive fault code.

Conditions

  • Connect all components
  • Turn keyswitch ON
  • Connect the INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 466 inactive?
YES NO
No Repair

Replace the ECM. Call for pre-authorization.

Refer to Procedure 019-031.

Guided Step 4 – Clear the fault codes.

Guided Step 4A – Disable the fault code.

Conditions

  • Connect all components
  • Turn keyswitch ON
  • Connect the INSITE™ electronic service tool.

Action

  • Start the engine and let idle for one minute.
  • Use INSITE™ electronic service tool to verify that the fault code is inactive.

Fault Code 466 inactive?
YES NO
No Repair No Repair

Guided Step 4B – Clear the inactive fault codes.

Conditions

  • Connect all components
  • Turn keyswitch ON
  • Connect the INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to erase the inactive fault codes.

All fault codes cleared?
YES NO
No Repair No Repair
Repair complete
Appropriate troubleshooting steps
Last Modified:  09-Sep-2004
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