Mazda 2002 6 Workshop Manual page 213

Diagnostic procedure
STEP
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F–66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
2 INSPECT POOR CONNECTION OF MAF
SENSOR CONNECTOR
• Turn ignition key to OFF.
• Disconnect the MAF/IAT sensor connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
3 INSPECT POWER SUPPLY CIRCUIT FOR OPEN
CIRCUIT
• Turn ignition key to ON (Engine OFF).
• Inspect voltage at MAF/IAT sensor terminal B
(harness-side).
• Is there voltage B+?
4 INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
5 INSPECT MAF SENSOR SIGNAL CIRCUIT FOR
OPEN CIRCUIT
• Remove PCM with PCM connector connected.
• Inspect for continuity between MAF/IAT sensor
terminal C (harness-side) and PCM terminal
1P (harness-side).
• Is there any continuity?
6 INSPECT MAF SENSOR SIGNAL CIRCUIT FOR
SHORTS
• Inspect continuity between following circuits:
— MAF/IAT sensor terminal C (harness-side)
and body ground
— MAF/IAT sensor connector terminal C
(harness-side) and B (harness-side)
• Are there any continuity?
7 VERIFY TROUBLESHOOTING OF DTC P0102
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from memory using WDS or
equivalent.
• Perform KOEO/KOER self-test.
(See F–66 KOEO/KOER
• Is same DTC present?
8 VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
(See F–66 AFTER REPAIR
• Is there any DTC present?
End Of Sie
F–84
ON-BOARD DIAGNOSTIC
INSPECTION
SELF-TEST.)
PROCEDURE.)
Yes Go to next step.
No Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F–227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
Yes Repair or replace terminals, then go to Step 7.
No Go to next step.
Yes Go to next step.
No Inspect for open circuit in wiring harness between MAF/IAT
sensor terminal B (harness-side) and main relay.
Repair or replace harness, then go to Step 7.
Yes Repair terminal, then go to Step 7.
No Go to next step.
Yes Go to next step.
No Repair or replace suspected harness, then go to Step 7.
Yes Repair or replace suspected harness, then go to next step.
No Replace MAF/IAT sensor, then go to next step.
Yes Replace PCM, then go to next step.
(See F–43 PCM REMOVAL/INSTALLATION.)
No Go to next step.
Yes Go to applicable DTC troubleshooting.
(See F–67 DTC TABLE.)
No Troubleshooting completed.
ACTION