Dtc P0108 - Mazda Mazda6 Workshop Manual Supplement

DTC P0108

DTC P0108 Boost sensor circuit high input
• PCM monitors input voltage from boost sensor while engine is running. If input voltage from boost sensor is
DETECTION
CONDITION above 4.9 V, PCM determines boost sensor circuit high input.
• Boost sensor malfunction
• Connector or terminal malfunction
• Boost sensor power and signal wiring short each other
POSSIBLE
• Open circuit in wiring between boost sensor terminal B and PCM terminal 36
CAUSE
• Open circuit in wiring between boost sensor terminal A and PCM terminal 91
• PCM malfunction
BOOST SENSOR
4
BOOST SENSOR
HARNESS SIDE CONNECTOR
C
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 BOOST
SENSOR CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
3 INSPECT BOOST SENSOR CIRCUIT FOR
SHORT WITH EACH OTHER
• Turn engine switch to OFF.
• Inspect continuity between boost sensor
terminals C and B
• Is there continuity?
4 INSPECT BOOST SENSOR
• Inspect boost sensor.
(See F2–78 BOOST SENSOR
• Is there any malfunction?
ON-BOARD DIAGNOSTIC
C
3
B
A
A
B
INSPECTION
INSPECTION)
3 5
90
6
5
36
6
5
91
HARNESS SIDE CONNECTOR
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 7.
No Go to next step.
Yes Repair or replace harness for short with each other, go to
Step 7.
No Go to next step.
Yes Replace boost sensor, go to Step 7.
(See F2–36 INTAKE-AIR SYSTEM REMOVAL/
INSTALLATION)
No Go to next step.
A6E407001082211
PCM
PCM
90 36
91
ACTION
F2–105
F2