Technical Manuals
What is the main purpose of a technical manual?
To provide technical information, specifications and procedures for servicing or repairing a vehicle.
Where would you normally find the correct tightening torque for a component?
In the manufacturer's service documentation or technical manual.
What does specification mean in a technical manual?
A required technical value or standard, such as voltage, torque, pressure or tolerance.
What should you do before starting a procedure in a service manual?
Read the procedure and check the required tools, safety precautions and specifications.
What is a job card?
A document that records the customer's complaint, diagnostic work, repairs and work carried out on the vehicle.
Why is it important to use the correct vehicle model and version when consulting a technical manual?
Different models or versions may have different components, specifications and procedures.
What is a wiring diagram used for?
To identify electrical connections, components, circuits and signal paths.
What is a tolerance?
The permitted variation from a specified value.
A manual says: “Disconnect the HV battery before removing the component.” What should the technician do?
Follow the instruction and complete the required high-voltage safety procedure before removing the component.
What information should normally be included in a service report?
Customer complaint, diagnostic findings, work performed, parts replaced and test results.
A manual gives a tightening torque of 80 Nm ± 5 Nm. What does this mean?
The specified torque is 80 Nm, with an acceptable range from 75 to 85 Nm.
Why should a technician check service bulletins or updated manufacturer information before repairing a vehicle?
The manufacturer may have published updated procedures, known faults or improved repair instructions.
What is the difference between procedure, specification and warning?
A procedure explains what to do; a specification gives a required technical value; a warning identifies a potential safety risk or important precaution.
Put these steps in the correct order: perform repair / read procedure / verify repair / diagnose fault / check specifications.
Diagnose the fault → read the procedure → check specifications → perform the repair → verify the repair.
Rewrite this informal note professionally: “Checked the car. Battery was bad. Changed it and now it works.”
“Vehicle inspected. Battery fault confirmed. Battery replaced in accordance with the manufacturer's procedure. Vehicle tested and operating correctly.”
A technician finds two different procedures for the same component in an online technical database. What should they check before choosing one?
Vehicle identification, model/year, powertrain configuration, component version and the manufacturer's latest applicable procedure.
Why is it important to record the exact DTCs found during diagnosis rather than simply writing “fault found”?
DTCs provide specific diagnostic information and create an accurate record of the condition identified.
Explain these terms: VIN, DTC, OEM, specification and tolerance.
VIN identifies the vehicle; DTC identifies a detected fault; OEM means Original Equipment Manufacturer; specification is a required value; tolerance is the permitted variation from that value.
A procedure states: “Inspect connector X for corrosion or damaged terminals. If no damage is found, perform continuity test Y.” What should the technician do?
First inspect connector X for corrosion or damage. If it is in good condition, continue with the specified continuity test.
Write a professional service-record entry: Customer complaint: EV will not start. DTC: HV isolation fault. Finding: damaged HV cable. Action: cable replaced and system tested.
“Customer reports that the vehicle will not start. Diagnostic scan identified an HV isolation fault. Inspection revealed a damaged high-voltage cable. Cable replaced according to the manufacturer's procedure and the high-voltage system tested successfully.”
A technician discovers that the workshop procedure differs from the procedure in the latest manufacturer documentation. Which should be followed and why?
The latest applicable manufacturer procedure should be followed because technical information may be updated to reflect revised specifications, safety requirements or improved repair methods.
A technical manual states: “Do not proceed if insulation resistance is below the specified value.” The measured value is below the limit. What should the technician do?
Stop the procedure, record the measurement, investigate the cause of the low insulation resistance and follow the manufacturer's diagnostic procedure. The technician should not proceed until the specified safety condition is met.
Explain the difference between “inspect,” “test,” “measure,” “replace” and “verify” in a service procedure.
“Inspect” means visually or physically check a component; “test” means perform a diagnostic check; “measure” means obtain a numerical value; “replace” means remove and install a new component; “verify” means confirm that the repair has resolved the problem and the system operates correctly.
A manual gives the following procedure: 1. Disconnect HV system. 2. Wait the specified time. 3. Verify zero voltage. 4. Remove the component. 5. Install the replacement. 6. Perform system test. Why is it important to follow this sequence exactly?
The sequence ensures the high-voltage system is safely isolated before work begins and ensures the repair is correctly completed and verified. Changing the sequence could create a safety risk or lead to an incorrect repair.
Write a concise professional diagnostic report using this information: Customer complaint: reduced charging power. DTC: battery temperature fault. Measured temperature: 52°C. Finding: insufficient coolant flow. Action: coolant pump replaced. Result: charging power returned to normal.
“Customer reported reduced charging power. Diagnostic scan identified a battery temperature fault, with a measured temperature of 52°C. Inspection found insufficient coolant flow, and the coolant pump was replaced in accordance with the manufacturer's procedure. Following repair, the charging system was tested and charging power returned to normal.”