Ford Ranger EV. Electric Manual

LESSON 5: DIAGNOSIS

5-31

ACTIVITY 8 – DIAGNOSIS – WORKSHEET N

PTC HEATER DIAGNOSIS DEMONSTRATION

STUDENT ANSWER SHEET

OBJECTIVE:

This is a demonstration of the correct safety and diagnostic procedures to follow when diag-

nosing a vehicle with a PTC heater concern. It will also show correct safety procedures to

follow when diagnosing HV components that are connected to the HVPDB.

DIRECTIONS:

As the diagnostic procedure is performed, monitor the procedure and answer the questions

below. Ask questions of the instructor as he performs this demonstration for any points that

you may have questions about.

1. What is the customer concern? _____________________________________________________________

______________________________________________________________________________________

2. What is the first section of the workshop manual that should be referenced to diagnose this system? ______

______________________________________________________________________________________

3. List the preliminary steps that are performed.

PRELIMINARY DIAGNOSTIC STEPS

RESULTS

VERIFY CONCERN

CONCERNED VERIFIED

PERFORM VISUAL INSPECTION

NO PROBLEMS SEEN

CHECK FOR NON-FACTORY

INSTALLED EQUIPMENT

NONE INSTALLED

RETRIEVE DTCS

(REVIEW DTC RETRIEVAL PROCEDURE)

DTC 1776 PRESENT IN IAA

GO TO DTC INDEX

GO TO SECTION 414-O2 FOR DIAGNOSTIC

DIRECTION

4. List the diagnostic steps performed and their results.

IRQ

: PTC Heater Core operation is dependent on ambient temperature. Ambient temperature sensor under

hood provides input to determine if one or both cores need to be turned on. Above 40°F, one core on; below

40°F, two cores on. Cores take turns coming on with each key cycle. Turn the key on at least twice with the heater

on to ensure that both heaters have been actuated.

DIAGNOSTIC TEST STEP

RESULT

NO, REPLACE HEATER CORE

END OF WORKSHEET N

Ford Ranger EV. Electric Manual - part 47