Tech Updates

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TRUCKS, PARTS, SERVICE â„¢ Staff (TPS)
Sep 1, 2009
Updated Oct 21, 2009

By Truck Parts & Service Staff

Turbocharger Faults
Wires within the smart remote actuator (SRA) connector located on the right-hand side of Mack MP7, MP8 and MP10 engines below the turbocharger are subject to vibration during engine operation.

This vibration can result in terminal fretting which produces very fine dust particles and can be seen as a fine green dust inside the connector. When these particles migrate between the female and male pin connectors, intermittent contact problems will result and be made evident by SID 27 and PSID 232 fault codes (see Figure 1).
Installing a connector back shell (Part No. 3985620) on the back of the male (mounting bracket side) SRA connector and securing the harness wires by installing a tie wrap around the fabric cover will correct this condition by dampening the vibration to reduce terminal fretting.

If you encounter multiple instances of logged SID 27 and PSID 232 fault codes, install the connector back shell and secure the wires as follows:

  • Disconnect the SRA connector (the bottom connector on the mounting bracket) and then unscrew the bulkhead nut to remove the connector body from the mounting bracket.
  • Clean both the SRA side and engine harness side of the connector with a high-quality electrical contact cleaner.
  • Install the plastic back shell (Part No. 3985620) over the back of the connector (male side), making sure the fabric cover extends inside the shell.
  • Secure the wires by installing a tie wrap (Part No. 948211) around the fabric cover immediately behind the plastic back shell (within 10mm of the rear of the shell).
  • Reinstall the connector body to the mounting bracket and then reconnect the connector. Road test the vehicle and recheck the system for faults.

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