Dtc P0102 - Mazda Mazda6 Workshop Manual Supplement

DTC P0102

DTC P0102 MAF sensor circuit low input
• PCM monitors input voltage from MAF sensor while engine is running. If input voltage from MAF sensor is
DETECTION
CONDITION below 0.2 V, PCM determines MAF sensor circuit low input.
• MAF sensor malfunction
• Connector or terminal malfunction
• Open circuit in wiring between PCM control relay terminal C and MAF/IAT sensor terminal A
POSSIBLE
• Short to GND in wiring between MAF/IAT sensor terminal C and PCM terminal 9
CAUSE
• MAF sensor signal and GND circuits short each other
• Open circuit in wiring between MAF/IAT sensor terminal C and PCM terminal 9
• PCM malfunction
MAF SENSOR
6
MAF SENSOR
HARNESS SIDE CONNECTOR
D
E
Diagnostic procedure
STEP
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform "DTC Confirmation Procedure".
(See F2–85 DTC CONFIRMATION
PROCEDURE)
• Is same DTC present during KOEO or KOER
self-test?
2 INSPECT POOR CONNECTION OF MAF
SENSOR CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
3 INSPECT MAF SENSOR POWER CIRCUIT FOR
OPEN
• Turn engine switch to ON. (Engine OFF)
• Inspect voltage at MAF/IAT sensor terminal A
(harness side).
• Is voltage below 1.0 V?
ON-BOARD DIAGNOSTIC
PCM CONTROL RELAY
TERMINAL C
3
A
4
C
B
C
B A
INSPECTION
5 8
9
5
14
PCM
HARNESS SIDE CONNECTOR
14
Yes Go to next step.
No Intermittent concern exists. Go to "Intermittent Concern
Troubleshooting".
(See F2–227 INTERMITTENT CONCERN
TROUBLESHOOTING)
Yes Repair or replace suspected terminal, go to Step 9.
No Go to next step.
Yes Repair or replace harness for open, go to Step 9.
No Go to next step.
A6E407001082208
PCM
9
ACTION
F2–99
F2