Mazda Mazda6 - Page 709

ON-BOARD DIAGNOSTIC
M–79
M
DTC P1888
A6E637027100204
Diagnostic procedure
DTC P1888 Differential oil temperature sensor
DETECTION
CONDITION
• Differential oil temperature sensor voltage monitor circuit detects abnormal input voltage.
POSSIBLE
CAUSE
• Open circuit, or short to battery or GND between 4WD CM terminal A and differential oil temperature
sensor terminal A
• Open circuit or short to battery between 4WD CM terminal C and differential oil temperature sensor
terminal B
• Differential oil temperature sensor malfunction
• 4WD CM malfunction
• Poor connection of connectors (female terminals)
STEP INSPECTION ACTION
1 INSPECT DIFFERENTIAL OIL
TEMPERATURE SENSOR CONDITION
• Turn ignition key to OFF.
• Disconnect differential oil temperature
sensor connector.
• Is it okay?
Yes Go to next step.
No Replace differential oil temperature sensor, then go to Step
7.
2 INSPECT 4WD CM TO DIFFERENTIAL OIL
TEMPERATURE SENSOR FOR OPEN
CIRCUIT
• Disconnect 4WD CM connector.
• Inspect for continuity between 4WD CM
terminal A and differential oil temperature
sensor terminal A.
• Is there continuity?
Yes Go to next step.
No Repair or replace harness for open circuit between 4WD CM
and differential oil temperature sensor, then go to Step 7.
3 INSPECT 4WD CM TO DIFFERENTIAL OIL
TEMPERATURE SENSOR FOR SHORT TO
POWER
• Inspect voltage between 4WD CM terminal A
and ground.
• Is voltage B+?
Yes Repair or replace harness for short to power between 4WD
CM and differential oil temperature sensor, then go to Step
7.
No Go to next step.
AB
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
A
C
A
B
4WD CM CONNECTOR
4WD CM
DIFFERENTIAL OIL
TEMPERATURE SENSOR
DIFFERENTIAL OIL TEMPERATURE
SENSOR CONNECTOR