Mazda 6 2002 Workshop Manual page 238

STEP
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+?
4 INSPECT COOLING FAN RELAY NO.2
• Inspect cooling fan relay No.2.
(See T–24 RELAY
• Is cooling fan relay No.2 okay?
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+?
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?
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?
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?
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
• Is same DTC present?
10 VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
(See F–66 AFTER REPAIR
• Is there any DTC present?
End Of Sie
ON-BOARD DIAGNOSTIC
INSPECTION
INSPECTION)
SELF-TEST.)
PROCEDURE.)
Yes Go to net step.
No Replace or replace harness for open, then go to Step 9.
Yes Go to net step.
No Replace cooling fan relay No.2, then go to Step 9.
Yes Repair or replace harness for short to power, then go to
Step 9.
No Go to net step.
Yes Repair or replace harness for open, then go to Step 9.
No Go to net step.
Yes Repair or replace terminal and/or connector, then go to
Step 9.
No Go to net step.
Yes Go to net step.
No Repair or replace harness for open, then go to net step.
Yes Replace PCM, then go to net step.
(See F–43 PCM REMOVAL/INSTALLATION.)
No Go to net step.
Yes Go to applicable DTC troubleshooting.
(See F–67 DTC TABLE.)
No Troubleshooting completed.
ACTION
F–141
F