NZQA Expiring unit standard / 24232 version 2
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Title / Demonstrate knowledge of turbocharger diagnostic procedures
Level / 4 / Credits / 2
Purpose / This theory-based unit standard is for people in the automotive fuel injection industry. People credited with this unit standard are able todemonstrate knowledge of turbocharger diagnostic procedures.
Classification / Motor Industry > Automotive Fuel Systems and Exhaust
Available grade / Achieved

Guidance Information

1Definition

Service information may include but is not limited to – technical information of a vehicle, machine, or product detailing operation; installation and servicing procedures; manufacturer instructions and specifications; technical terms and descriptions; and detailed illustrations. This can be accessed in hard copy or electronic format and is normally sourced from the manufacturer.

2Recommended entry information: Unit 24179, Demonstrate knowledge of a forced air intake system on an engine.

Outcomes and performance criteria

Outcome 1

Demonstrate knowledge of turbocharger diagnostic procedures.

Performance criteria

1.1The importance of cleanliness when working with turbochargers is identified in accordance with service information.

Rangecontamination, precise machine tolerances and close operating fits of components, damage and premature failure.

1.2Faults that affect turbocharger operation are described in accordance with service information.

Rangeincludes but is not limited to – air contamination and restrictions, air leaks, impact damage, wear, oil contamination and feed, housing damage, excessive shaft play, imbalance of rotating parts.

1.3Wear patterns on components are identified in accordance with service information.

Rangeincludes but is not limited to – lack of lubricant, foreign object introduction, contamination of lubricant.

1.4Symptoms that can indicate turbocharger faults are identified in accordance with service information.

Rangeengine lacks power, black exhaust smoke, blue exhaust smoke, excessive engine oil consumption, noisy turbocharger operation.

1.5Turbocharger diagnostic procedures are described in accordance with service information.

Rangeincludes but is not limited to – stripping, reassembly, cleaning, inspection of parts, identifying and recording faults, recommending repairs and replacement of parts.

Replacement information / This unit standard and unit standard 24233 replaced unit standard 19304.

This unit standard is expiring. Assessment against the standard must take place by the last date for assessment set out below.

Status information and last date for assessment for superseded versions

Process / Version / Date / Last Date for Assessment
Registration / 1 / 25 January 2008 / 31 December 2020
Review / 2 / 26 April 2018 / 31 December 2020
Consent and Moderation Requirements (CMR) reference / 0014

This CMR can be accessed at

MITO New Zealand Incorporated
SSB Code 101542 / New Zealand Qualifications Authority 2018