Troubleshotting
U-39
Step Inspection Action
*10
Verify whether malfunction is in temperature
sensor system or elsewhere.
l Turn ignition switch to lock position.
l Disconnect the refrigerant pressure switch.
l Turn ignition switch to on position.
l Set front fan switch at 1st position.
l Measure voltage at wiring harness side of
the following refrigerant pressure switch
connector terminals (a/c signal)
— (gy engine) terminal c
l Is voltage approximately equivalent to b+
(positive battery voltage) with a/c switch
off and 0v when it is on?
Yes Go to step 16.
No Reconnect refrigerant pressure switch,
go to next step.
*11 Verify whether malfunction is in temperature
sensor and wiring harness (continuity
between fuse block and humidity sensor) or
elsewhere.
l Disconnect temperature sensor.
l Start engine.
l Turn both a/c switch and front fan switch
on.
l When a/c amplifier connector terminals b
short circuit with c (at wiring harness side）
are short, does cold air blow out?
Yes Remove shorted wire, go to next step.
No Remove shorted wire, go to step 13.
*12 Verify whether malfunction is in temperature
sensor and wiring harness (continuity
between fuse block and humidity sensor) or
elsewhere.
l Turn ignition switch to on position.
l Measure voltage at wiring harness side of
temperature sensor connector terminal a
(ig2 signal).
l Is voltage approximately equivalent to b+
(positive battery voltage)?
Yes Inspect temperature sensor, go to step
28.
No Repair wiring harness between fuse
block and temperature sensor, then go to
step 28
*13
Inspect wiring harness between temperature
sensor and refrigerant pressure switch for
short with b+ (positive battery voltage)
l Turn ignition switch to on position.
l Measure voltage at wiring harness side of
temperature sensor connector terminal c
(a/c signal).
l Is voltage approximately equivalent to b+
(positive battery voltage)
Yes Repair wiring harness between
refrigerant pressure switch and
temperature sensor, then go to step 28.
No Go to next step.
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