Troubleshotting
U-41
Step Inspection Action
*19
Verify whether malfunction is in a/c relay
system (at coil side) or elsewhere. Turn
ignition switch to on position.
l Turn off a/c switch.
l Measure voltage at pcm connector terminal
69 (ig1 signal).
l Is voltage approximately equivalent to b+
(positive battery voltage)?
Yes Go to step 23.
No Go to next step.
*20
Inspect a/c relay (at coil side) power line fuse.
l Is a/c relay power line fuse normal?
Yes Go to next step.
No Inspect for a short to ground on blown
fuse circuit. Repair or replace as
required. Install fuse with appropriate
rating.
*21
Inspect wiring harness between fuse block
and a/c relay (at coil side).
l Turn ignition switch to on position.
l Measure voltage at a/c relay connector
terminal a (ig2 signal).
l Is voltage approximately equivalent to b+
(positive battery voltage)?
Yes Go to next step.
No Repair wiring harness between fuse
block and a/c relay, go to step 28.
*22 Inspect a/c relay(at coil side)
l Inspect a/c relay.
— Is it normal?
Yes Repair wiring harness between a/c relay
and pcm (terminal 69), go to step 28.
No Replace a/c relay, go to step 28.
*23
Inspect operation performance of cooling
system.
l Inspect operation performance of cooling
system
— Gy: (see f-188, cooling fan control system
inspection (with a/c))
Yes Go to next step.
No Go to appropriate inspection procedure.
*24
Inspect a/c relay (at switch side) power line
fuse.
l Is a/c relay power line fuse normal?
Yes Go to next step.
No Inspect for a short to ground on blown
fuse circuit.
Repair or replace as required.
Install fuse with appropriate rating.
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