Dtc P0103 - Mazda Mazda6 Workshop Manual Supplement

DTC P0103

DTC P0103 MAF sensor circuit high input
• PCM monitors input voltage from MAF sensor while engine is running. If input voltage from MAF sensor is
DETECTION
CONDITION above 4.9 V, PCM determines MAF sensor circuit high input.
• MAF sensor malfunction
• Connector or terminal malfunction
• Short to power circuit in wiring between MAF/IAT sensor terminal C and PCM terminal 9
POSSIBLE
• MAF sensor power and signal circuits short each other
CAUSE
• Open circuit in wiring between MAF/IAT sensor terminal B and PCM terminal 14
• PCM malfunction
MAF SENSOR
5
HARNESS SIDE CONNECTOR
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 SIGNAL CIRCUIT FOR
SHORT TO POWER
• Turn engine switch to ON. (Engine OFF)
• Inspect voltage between MAF/IAT sensor
terminal C and body GND.
• Is voltage below 1.0 V?
4 INSPECT MAF SENSOR CIRCUIT FOR SHORT
WITH EACH OTHER
• Turn engine switch to OFF.
• Inspect continuity between MAF/IAT sensor
terminals A and C.
• Is there continuity?
ON-BOARD DIAGNOSTIC
PCM CONTROL RELAY
TERMINAL C
4
A
C
B
MAF SENSOR
B
D C A
INSPECTION
6
4
3
9
6
14
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 8.
No Go to next step.
Yes Go to next step.
No Repair or replace harness for short to power, go to Step 8.
Yes Repair or replace harness for short with each other, go to
Step 8.
No Go to next step.
A6E407001082209
PCM
PCM
9
ACTION
F2–101
F2