Mazda 6 2002, Workshop Manual

Page: 271 / 1248

ON-BOARD DIAGNOSTIC
F–141
F
End Of Sie
3 INSPECT COOLING FAN RELAY NO.2 POWER
CIRCUIT FOR OPEN
•
Turn ignition switch to ON (Engine OFF).
•
Measure voltage between cooling fan relay
No.2 terminal E (harness side) and body
ground.
•
Is voltage B+ ?
Yes Go to next step.
No Replace or replace harness for open, then go to Step 9.
4 INSPECT COOLING FAN RELAY NO.2
•
Inspect cooling fan relay No.2.
(See
T–24 RELAY INSPECTION )
•
Is cooling fan relay No.2 okay?
Yes Go to next step.
No Replace cooling fan relay No.2, then go to Step 9.
5 INSPECT COOLING FAN RELAY NO.2
CONTROL CIRCUIT FOR SHORT TO POWER
•
Measure voltage between cooling fan relay
No.2 terminal A (harness side) and body
ground.
•
Is voltage B+ ?
Yes Repair or replace harness for short to power, then go to
Step 9.
No Go to next step.
6 INSPECT COOLING FAN RELAY NO.2
CONTROL CIRCUIT FOR SHORT TO GROUND
•
Inspect continuity between cooling fan relay
No.2 terminal A (harness side) and body
ground.
•
Is there continuity?
Yes Repair or replace harness for open, then go to Step 9.
No Go to next step.
7 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
•
Turn ignition key to OFF.
•
Disconnect PCM connector.
•
Inspect for poor connection (damaged/pulled-
out pins, corrosion, etc.).
•
Is there malfunction?
Yes Repair or replace terminal and/or connector, then go to
Step 9.
No Go to next step.
8 INSPECT COOLING FAN RELAY NO.2
CONTROL CIRCUIT FOR OPEN CIRCUIT
•
Inspect continuity between cooling fan relay
No.2 terminal A and PCM terminal 4L.
•
Is there continuity?
Yes Go to next step.
No Repair or replace harness for open, then go to next step.
9 VERIFY TROUBLESHOOTING OF DTC P0480
COMPLETED
•
Make sure to reconnect all disconnected
connectors.
•
Clear DTC from PCM memory using WDS or
equivalent.
•
Perform KOEO/KOER self-test.
(See
F–66 KOEO/KOER SELF-TEST .)
•
Is same DTC present?
Yes Replace PCM, then go to next step.
(See F–43 PCM REMOVAL/INSTALLATION .)
No Go to next step.
10 VERIFY AFTER REPAIR PROCEDURE
•
Perform “After Repair Procedure”.
(See
F–66 AFTER REPAIR PROCEDURE .)
•
Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See F–67 DTC TABLE .)
No Troubleshooting completed.
STEP INSPECTION ACTION