Mazda 3 Workshop Manual page 149

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
• Is there any malfunction?
INSPECT FAN CONTROL MODULE SIGNAL
CIRCUIT FOR SHORT TO GND
• Turn the ignition switch off.
4
• Inspect for continuity between fan control
module terminal C (wiring harness-side) and
body GND.
• Is there continuity?
INSPECT FAN CONTROL MODULE SIGNAL
CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position
(Engine off).
5
• Measure the voltage between fan control
module terminal C (wiring harness-side) and
body GND.
• Is the voltage B+?
INSPECT FAN CONTROL MODULE
• Inspect the fan control module.
6
(See COOLING FAN MOTOR COMPONENT
INSPECTION.)
• Is there any malfunction?
INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
7
• Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
• Is there any malfunction?
INSPECT FAN CONTROL MODULE SIGNAL
CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch off.
8
• Inspect for continuity between fan control
module terminal C (wiring harness-side) and
PCM terminal 1AP (wiring harness-side).
• Is there continuity?
9
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Repair or replace the wiring harness for a
Yes
possible short to GND, then go to Step 9.
No Go to the next step.
Repair or replace the wiring harness for a
Yes possible short to power supply, then go to
Step 9.
No Go to the next step.
Replace the cooling fan component, then
go to Step 9.
Yes
(See RADIATOR
REMOVAL/INSTALLATION.)
No Go to the next step.
Repair or replace the terminal, then go to
Yes
Step 9.
No Go to the next step.
Yes Go to the next step.
Repair or replace the wiring harness for a
No possible open circuit, then go to the next
step.
Yes Replace the PCM, then go to the next step.
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