Isuzu KB P190. Manual - part 35

 

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Isuzu KB P190. Manual - part 35

 

 

1-106  HEATER AND AIR CONDITIONING 

 

 
 
 

Open circuit between the engine 
harness connector terminal No.1 (E-3) 
and the engine room harness 
connector terminal No.2 (X-14). 

YES 

• Is there battery voltage between the engine room 
harness connector terminal No.1 (X-14) and 
ground? 

YES 

• Disconnect the A/C thermo relay. 

YES 

• Is there continuity between the ECM harness 
connector terminal No.55 (C-58) and the engine 
room harness connector terminal No.5 (X-14)? 

NO

Open circuit between the No. EB-13 
fuse and the engine room harness 
connector terminal No.1 (X-14). 

NO

Open circuit between the engine room 
harness connector terminal No.3 (X-
14) and the engine room harness 
connector terminal No. 1 (X-15). 

NO

• Is there continuity between the engine room 
harness connector terminal No.3 (X-14) and the 
engine room harness connector terminal No.1 (X-
15). 

YES 

• Is there continuity between the ECM harness 
connector terminal No.4 (C-58) and the engine 
room harness connector terminal No.1 (X-15)? 

Open circuit between the ECM 
harness connector terminal No.55 (C-
58) and the engine room harness 
connector terminal No. 5 (X-14). 

NO

YES 

• Is there battery voltage between the engine room 
harness connector terminal No.2 (X-15) and 
ground? 

Open circuit between the ECM 
harness connector terminal No. 4 (C-
58) and the engine room harness 
connector terminal No. 1 (X-15). 

NO

YES 

• Is there continuity between the engine room 
harness connector terminal No. 5 (X-15) and the 
engine room harness connector terminal No. 1 (C-
24)? 

Open circuit between the No. EB-13 
fuse and the engine room harness 
connector terminal No. 2 (X-15). 

NO

• Disconnect the ECM harness connector. 

• Disconnect the pressure switch. 

 

 

HEATER AND AIR CONDITIONING  1-107 

 

 
 

YES 

• Disconnect the condenser fan relay. 

YES 

• Is there battery voltage between the engine 
room harness connector terminal No.3 (C-
24) and ground? 

Open circuit between the condenser 
fan relay No.3 (X-9) and the engine 
room harness connector terminal No. 
4 (C-24). 

NO

• Is there continuity between the relay terminal 
No. 3 (X-9) and engine room harness connector 
terminal No.4 (C-24)? 

YES 

Open circuit between the No. EB-13 
fuse and engine room harness 
connector terminal No. 3 (C-24). 

NO

YES 

• Is there battery voltage between the engine 
room harness connector terminal No.3 (C-55) 
and ground? 

Open circuit between the engine room 
harness connector terminal No. 2 (C-
24) and the engine room harness 
connector terminal No. 2 (C-55). 

NO

YES 

• Is there continuity between the engine room 
harness connector terminal No.1 (C-55) and 
ground (C-109) ? or (cooler only) the short 
connector terminal No.3 (B-79) and ground (C-
109)? 

Open circuit between the No. EB-13 
fuse and the engine room harness 
connector terminal No. 3 (C-55). 

NO

• connect the A/C thermo relay connector. 

• Disconnect the electronic thermostat. 

• Is there continuity between the engine room 
harness connector terminal No. 2 (C-55) and the 
engine room harness connector terminal No. 2 
(C-24)? 

Open circuit between the engine room 
harness connector terminal No. 5 (X-
15) and the engine room harness 
connector terminal No. 1 (C-24). 

NO

 

1-108  HEATER AND AIR CONDITIONING 

 

 

YES 

• Disconnect the A/C switch. 

• Is there battery voltage between the chassis side 
harness connector terminal No. 6 (B-57) and ground? 

Open circuit between the engine room 
harness connector terminal No. 1 (C-55) or 
(cooler only) the short connector No. 3 (B-
79) and ground (C-109). 

NO 

YES 

• Is there continuity between the engine room harness 
connector (cooler only) terminal No. 4 (C-55) and the 
chassis side harness connector terminal No. 11 (B-57)? 

Open circuit between the engine room 
harness connector (cooler only) terminal 
No. 4 (C-55) and the chassis side harness 
connector terminal No. 11 (B-57). 

NO 

YES 

• Is there battery voltage between the chassis side 
harness connector terminal No. 10 (B-57) and ground? 

Open circuit between the chassis side 
harness connector No. 1 (B-79) and the 
chassis side harness connector terminal 
No. 10 (B-57). 

NO 

YES 

• Is the electronic thermostat OK? 

Open circuit between the No. EB-13 fuse 
and the chassis side harness connector 
No. 6 (B-57). 

NO 

YES 

• Defective ECM 

Replace electronic thermostat 

NO 

 

 

 

HEATER AND AIR CONDITIONING  1-109 

4JJ1-TC Standard Output, 4JJ1-TC High Output, 4JK1-TC High Output LHD MODEL 

 

 

 

 

 

RTW710XF000501 

 

 

 

 

 

 

 

 

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