Mazda Mazda6 - Page 707

ON-BOARD DIAGNOSTIC
M–77
M
DTC P1887
A6E637027100203
Diagnostic procedure
DTC P1887 System wiring
DETECTION
CONDITION
• Current detection circuit in 4WD CM detects current above specification for more than specified period.
• 4WD CM detects that 4WD solenoid control signal differs from current detected at current detection
circuit for more than specified period.
• Relay voltage detection circuit detects that voltage does not concur with relay ON/OFF signal for more
than specified period.
POSSIBLE
CAUSE
• Open circuit or short to GND in harness between battery and 4WD CM terminal K
• Open circuit or short to GND between 4WD CM terminal O and 4WD solenoid terminal B
• Open circuit between 4WD CM terminal P and 4WD solenoid terminal A
• Open circuit between 4WD CM terminal N and body GND
• Open or short circuit in 4WD CM internal circuit
• ENG+B (10A) fuse malfunction
• 4WD solenoid malfunction
• 4WD CM malfunction
• Poor connection of connectors (female terminals)
STEP INSPECTION ACTION
1 INSPECT 4WD SOLENOID CONDITION
• Turn ignition key to OFF.
• Disconnect 4WD solenoid connector.
• Inspect 4WD solenoid.
(See M–66 4WD SOLENOID INSPECTION)
• Is it okay?
Yes Go to next step.
No Replace 4WD solenoid, then go to Step 9.
2 INSPECT 4WD SOLENOID TO 4WD CM
(POWER SUPPLY CIRCUIT) FOR OPEN
CIRCUIT
• Disconnect 4WD CM connector.
• Inspect for continuity between 4WD CM
terminal O and 4WD solenoid terminal B.
• Is there continuity?
Yes Go to next step.
No Repair or replace harness for open circuit between 4WD CM
and 4WD solenoid, then go to Step 9.
A
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
B
K
O B
A
N
P
BATTERY
FUSE (ENG+B 10 A)
4WD CM
4WD CM CONNECTOR
4WD SOLENOID
4WD SOLENOID CONNECTOR
RELAY