Mazda CX-9 Grand Touring 2009 Manual page 1163

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
CIRCUIT FOR SHORT TO POWER
SUPPLY
Turn the ignition switch to the ON
position (Engine off).
6
Remove the A/C relay.
Measure voltage between A/C relay
terminal E (wiring harness-side) and
body ground.
Is voltage B+?
INSPECT A/C RELAY CONTROL
CIRCUIT FOR SHORT TO GROUND
Install the A/C relay.
Turn the ignition switch off.
7
Inspect continuity between A/C relay
terminal E (wiring harness-side) and
body ground.
Is there continuity?
INSPECT PCM CONNECTOR FOR
POOR CONNECTION
Turn ignition switch to off.
8
Disconnect the PCM connector.
Inspect for poor connection (such as
damaged, pulled-out pins, corrosion).
Is there any malfunction?
INSPECT A/C RELAY CONTROL
CIRCUIT FOR OPEN CIRCUIT
Turn the ignition switch off.
9
Inspect continuity between A/C relay
terminal E (wiring harness-side) and
PCM terminal 1N (wiring harness-
side).
Is there continuity?
INSPECT A/C RELAY
Inspect A/C relay. (See RELAY
10
INSPECTION .)
Is A/C relay normal?
INSPECT FOR CORRECT PCM
OPERATION
2008 Mazda CX-9 Grand Touring
Repair or replace suspected part, then go to Step
Yes
12.
No
Repair or replace suspected part, then go to Step
Yes
12.
No
Repair or replace suspected part, then go to Step
Yes
12.
No
Yes Go to the next step.
Repair or replace suspected part, then go to Step
No
Yes Go to the next step.
Replace the A/C relay. Start the engine. Turn on
No the A/C switch. Wait for 15 s. Turn off the A/C
Go to the next step.
Go to the next step.
Go to the next step.
12.
switch, then go to Step 12.