TROUBLE DIAGNOSES — Diagnostic Procedure 4 (Cont'd) — Thermo control amp + A/C relay coil checks
HA-77flowchartPage completes the A/C-relay-coil-side path (G via E.C.C.S. continuity) and the thermo-control-amp branch (H/I/J/K). Branch D continues on HA-78 covering the push-control-unit-side electrical signal output.
Diagnostic Procedure 4 (Cont'd)
Diagnostic Procedure 4 (Cont'd) — thermo control amp branch
1
(From previous page — branch B: coil supply OK)
2
[H] CHECK VOLTAGE FOR THERMO CONTROL AMP. Do approx. 12 volts exist between thermo control amp harness terminal No. 44 and body ground?
N.G.
CHECK POWER SUPPLY FOR THERMO CONTROL AMP. Go to Main Power Supply and Ground Circuit Check.
O.K.
3
[I] CHECK BODY GROUND CIRCUIT FOR THERMO CONTROL AMP. Disconnect thermo control amp. harness connector. Does continuity exist between thermo control amp. harness terminal No. 13 and body ground?
O.K.
Replace thermo control amp.
N.G.
4
Disconnect push control unit harness connector.
5
[K] Check circuit continuity between thermo control amp. harness terminal No. 13 and push control unit harness terminal No. 13.
O.K.
6
(Go to next page.) — branch D
NOTE
If the result is N.G. after checking circuit continuity, repair harness or connector.