HAIMA 7 - Page 450

Troubleshooting
U-40
Step Inspection Action
*14
Inspect continuity of wiring harness between
temperature sensor and refrigerant pressure
switch.
l Turn ignition switch to lock position.
l Inspect continuity between following
temperature sensor terminals (a/c signal)
and refrigerant pressure switch terminal.
— (gy engine) terminal c
— Terminal c
l Is there continuity?
Yes Go to next step.
No Repair wiring harness between
refrigerant pressure switch and
temperature sensor, then go to step 28.
*15
Inspect continuity of wiring harness between
front climate control unit and temperature
sensor
l Is there continuity between front climate
control unit terminal i and temperature
sensor terminal b?
Yes Replace front climate control unit
No Repair wiring harness between front
climate control unit and temperature
sensor.
*16
Verify whether malfunction is in pcm and
wiring harness (continuity between pcm and
refrigerant pressure switch) or elsewhere.
l Turn ignition switch to on position.
l Measure voltages of following refrigerant
pressure switch connector terminals (at
wiring harness side)
— (gy engine) terminal a.
l Is voltage approximately equivalent to b+
(positive battery voltage)?
Yes Go to steps 18.
No Go to next step.
*17 Verify whether malfunction is in pcm or
wiring harness (pcm and refrigerant pressure
switch)
l Measure voltage at pcm terminal 41 (a/c
signal).
l Is voltage approximately equivalent to b+
(positive battery voltage)?
Yes Repair wiring harness between pcm and
refrigerant pressure switch, then go to
step 28.
No Inspect pcm, then go to step 28.
*18
Verify whether malfunction is in refrigerant
pressure switch or elsewhere.
l When following refrigerant pressure switch
connector terminals (at wiring harness
side) are short, does cold air blow out?
— (gy engine) terminal a.
— Terminal c.
Yes Inspect refrigerant pressure switch, then
go to step 28.
No Disconnect shorted circuit and reconnect
refrigerant pressure switch terminal, go
to next step.