Mazda CX-7 2007 Workshop Manual page 195

Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has the FREEZE FRAME DATA been
recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related Service Bulletins and/or on-line
repair information availability.
• Is any related repair information available?
3 INSPECT FAN CONTROL MODULE No.1
CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the fan control module No.1
connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
4 INSPECT FAN CONTROL MODULE No.1
SIGNAL CIRCUIT FOR SHORT TO POWER
SUPPLY
• Turn the ignition switch to the ON position
(Engine off).
• Measure the voltage between fan control
module No.1 terminal 1B (wiring harness-side)
and body ground.
• Is the voltage B+?
5 INSPECT FAN CONTROL MODULE No.1
SIGNAL CIRCUIT FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between fan control
module No.1 terminal 1B (wiring harness-side)
and body ground.
• Is there continuity?
6 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
7 INSPECT FAN CONTROL module No.1 SIGNAL
CIRCUIT FOR OPEN CIRCUIT
• Inspect for continuity between fan control
module No.1 terminal 1B (wiring harness-side)
and PCM terminal 1AE.
• Is there continuity?
8 INSPECT FAN CONTROL module No.1
• Perform the fan control module No.1
inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
• Is the fan control module No.1 normal?
9 VERIFY TROUBLESHOOTING OF DTC P0480
COMPLETED
• Clear the DTC from the PCM memory using
the M-MDS.
• Start the engine.
• Turn A/C switch to ON.
• Is the same DTC present?
10 VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
End Of Sie
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
Yes Go to the next step.
No Record the FREEZE FRAME DATA on the repair order,
then go to the next step.
Yes Perform the repair or diagnosis according to the available
repair information.
• If the vehicle is not repaired, go to the next step.
No Go to the next step.
Yes Repair or replace the terminal, then go to Step 9.
No Go to the next step.
Yes Repair or replace the wiring harness for an open circuit,
then go to Step 9.
No Go to the next step.
Yes Repair or replace the wiring harness for an open circuit,
then go to Step 9.
No Go to the next step.
Yes Repair or replace the terminal, then go to Step 9.
No Go to the next step.
Yes Go to the next step.
No Repair or replace the wiring harness for an open circuit,
then go to Step 9.
Yes Go to the next step.
No Replace the fan control module No.1, then go to the next
step.
Yes Replace the PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)
No Go to the next step.
Yes Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Troubleshooting completed.
ACTION
01-02–153
01-02