TROUBLE DIAGNOSES — Electrical Components Inspection (Dual-pressure switch, Thermo control amp., A/C relay)

HA-51prose procedure

Dual-pressure switch psi values printed as '26 - 24' on the third row (the imperial column appears reversed); preserved verbatim from the manual.

Electrical Components Inspection

High-pressure slide line pressure kPa (kg/cm², psi)	Operation	Continuity
Decreasing to 177 - 216 (1.8 - 2.2, 26 - 31)	Turn OFF	Does not exist
Increasing to 2,452 - 2,844 (25 - 29, 356 - 412)	Turn OFF	Does not exist
Increasing to 177 - 235 (1.8 - 2.4, 26 - 24)	Turn ON	Exists
Decreasing to 1,863 - 2,256 (19 - 23, 270 - 327)	Turn ON	Exists

Decreasing to 177 - 216 (1.8 - 2.2, 26 - 31)

OperationTurn OFF

ContinuityDoes not exist

Increasing to 2,452 - 2,844 (25 - 29, 356 - 412)

OperationTurn OFF

ContinuityDoes not exist

Increasing to 177 - 235 (1.8 - 2.4, 26 - 24)

OperationTurn ON

ContinuityExists

Decreasing to 1,863 - 2,256 (19 - 23, 270 - 327)

OperationTurn ON

ContinuityExists

Evaporator outlet air temperature °C (°F)	Thermo amp. operation	Tester
Decreasing to 2.5 - 3.5 (37 - 38)	Turn OFF	Approx. 12V
Increasing to 4.0 - 5.0 (39 - 41)	Turn ON	Approx. 0V

Decreasing to 2.5 - 3.5 (37 - 38)

Thermo amp. operationTurn OFF

TesterApprox. 12V

Increasing to 4.0 - 5.0 (39 - 41)

Thermo amp. operationTurn ON

TesterApprox. 0V

Check circuit continuity between terminals by supplying 12 volts to coil side terminal of A/C relay.