DTC 5-3-5

5-3-5 TURBOCHARGER CONTROL VALVE, SIGNAL

Preconditions for DTC
^ If the Turbocharger (TC) control valve circuit is short circuited to ground/voltage supply or if there is a break in the circuit, the ECM interprets this as a fault and DTC 5-3-5 is set.

Substitute values
^ Idle air trim inhibited.
^ Fuel trim inhibited.
^ Conditions for fuel shut-off changed.

Fault sources
^ Signal too high:
- Signal lead short circuited to voltage supply.
- Detective TC control valve.

^ Signal too low:
- Signal lead short circuited to ground.
- Break in signal or voltage supply lead.
- Contact resistance in connectors.
- Defective TC control valve.

Fault symptoms
^ Improved or impaired performance owing to excessively high or excessively low charge pressure.

TESTING PROCEDURE





Status Message
^ Check current status message.

CAUTION: In order to obtain the correct status message, it might be necessary to floor the accelerator quickly a couple of times before the DTC is read.

If Status message is: Permanent fault, signal too high:
- Proceed to: PERMANENT FAULT, SIGNAL TOO HIGH section below.
If Status message is: Permanent fault, signal too low:
- Proceed to: PERMANENT FAULT, SIGNAL TOO LOW section below.
If Status message is: Intermittent fault, signal too high:
- Proceed to: INTERMITTENT FAULT, SIGNAL TOO HIGH section below.
If Status message is: Intermittent fault, signal too low:
- Proceed to: INTERMITTENT FAULT, SIGNAL TOO LOW section below.

PERMANENT FAULT, SIGNAL TOO HIGH





Checking the Signal Lead
^ Switch Ignition OFF.
^ Disconnect TC control valve.
^ Switch Ignition ON.
^ Connect a voltmeter between TC control valve connector 2 and ground.

The voltmeter should show less than 1 Volt.

If the reading is OK:
- Test with a new TC control valve.
- Replace the TC control valve.
If the reading is incorrect:
- Check the lead between TC control valve connector 2 and ECM B41 for signs of short circuiting to voltage supply.

PERMANENT FAULT, SIGNAL TOO LOW





Checking the Voltage Lead
^ Switch Ignition OFF.
^ Disconnect the TC control valve.
^ Switch Ignition ON.
^ Connect a voltmeter between TC control valve connector 1 and ground.

The voltmeter should show battery voltage.

If the reading is OK:
- Check the signal lead.
If the reading is incorrect:
- Check the lead between the main relay (2/32) connector 3 and TC control valve connector 1 for signs of a break.





Checking the Signal Lead
^ Switch Ignition OFF.
^ Wait for approx. 150 seconds.
^ TC control valve disconnected.
^ Connect an ohmmeter between TC control valve connector 2 and ground.

The ohmmeter should show 27 - 37K ohms.

If the reading is OK:
- Check the TC control valve.
If the ohmmeter shows approx. 0 ohms:
- Check the lead between TC control valve connector 2 and ECM B41 for signs of short circuiting to ground.
If the ohmmeter shows infinite resistance:
- Check the ECM connector.





Checking the ECM Connector
^ Switch Ignition OFF.
^ TC control valve disconnected.
^ Rectify the ECM connector with regard to contact resistance and oxidation.
^ ECM connected.





^ Connect an ohmmeter between TC control valve connector 2 and ground.

The ohmmeter should show 27 - 37K ohms.

If the reading is OK:
- The fault source is poor contact in the ECM connector.
If the ohmmeter still shows infinite resistance:
- Check the lead between TC control valve connector 2 and ECM B41 for signs of a break.





Checking the TC Control Valve
^ Switch Ignition OFF.
^ Connect the TC control valve.
^ Switch Ignition ON.
^ Erase the DTC.





^ START the engine.
^ Floor the accelerator quickly a couple of times.

Check if the DTC returns.

If the fault remains:
- The DTC will return within 1 minute.
If the DTC returns:
- Test with a new TC control valve.
- Replace the TC control valve.
If the DTC does not return:
- The source of the DTC is poor contact in the TC control valve connector.
- Rectify the connector with regard to contact resistance and oxidation.

INTERMITTENT FAULT, SIGNAL TOO HIGH





Checking the Leads and Connections
^ Check the TC control valve's and ECM's connector for signs of loose connection, contact resistance and oxidation.
^ Check the lead between TC control valve connector 2 and ECM B41 for signs of intermittent short circuiting to voltage supply.

INTERMITTENT FAULT, SIGNAL TOO LOW

Checking the Leads and Connections
^ Check the TC control valve's and ECM's connector for signs of loose connection, contact resistance and oxidation.
^ Check the lead between TC control valve connector 2 and ECM B41 for signs of an intermittent break and intermittent short circuiting to ground.
^ Check the lead between TC control valve connector 1 and the main relay (2/32) connector 3 for signs of an intermittent break.