Isuzu 2000 Trooper Workshop Manual page 75

1A–46 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Magnetic Clutch Does Not Run (Cont'd)
Step
14 Check to see if battery voltage is present at chassis side
connector terminal No. C1-B14.
Is there a battery voltage?
15 Check to see if continuity between chassis side relay terminal No.
X-54 and chassis side connector terminal No. C3-E15.
Is there a continuity?
16 Check to see if battery voltage is present at chassis side relay
terminal No. X5-1.
Is there a battery voltage?
17 1. Reconnect thermostat relay.
2. Check to see if battery voltage is present at chassis side
connector terminal No. B4-3.
Is there a battery voltage?
18 Check to see if battery voltage (appox 10V) is present at chassis
side connector terminal No. B4-1.
Is there a battery voltage?
19 Check to see if continuity between chassis side connector
terminal No. B4-2 and No. I18-4.
Is there a continuity?
20 Check to see if battery voltage is present at chassis side
connector terminal No. I23-2.
Is there a battery voltage?
Action Yes
Power train
control module
(PCM) defective.
Refer to Open circuit
between No.
Driveability and
Emissions in X7-3 and No.
Engine section.
Power train
control module
(PCM) defective.
Refer to
Driveability and
Emissions in
Open circuit
Engine section.
Go to Step 17 Go to Step 20
Open circuit
between No.I23-6
Go to Step 18 and No.B4-3.
Open circuit
between No.
X5-3 and No.
Go to Step 19
Open circuit
between No.
B4-2 and No.
I18-4 or poor
Electronic
ground (Fan
thermostat
Switch Ground
defective.
Open circuit
Open circuit
between No.
between X5-1
C-20 (10A) fuse
and No.I23-6.
and No.I23-2.
No
C1-B14.
B4-1.
Circuit).