Mazda Mazda6 Workshop Manual Supplement page 709

DTC P1888
DTC P1888
DETECTION
• Differential oil temperature sensor voltage monitor circuit detects abnormal input voltage.
CONDITION
• 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
POSSIBLE
terminal B
CAUSE
• Differential oil temperature sensor malfunction
• 4WD CM malfunction
• Poor connection of connectors (female terminals)
4WD CM CONNECTOR
O M K
P N L
Diagnostic procedure
STEP
1 INSPECT DIFFERENTIAL OIL
TEMPERATURE SENSOR CONDITION
• Turn ignition key to OFF.
• Disconnect differential oil temperature
sensor connector.
• Is it okay?
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?
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+?
ON-BOARD DIAGNOSTIC
Differential oil temperature sensor
4WD CM
A
C
I G E C A
J H F D B
INSPECTION
DIFFERENTIAL OIL
TEMPERATURE SENSOR
A
B
DIFFERENTIAL OIL TEMPERATURE
SENSOR CONNECTOR
Yes Go to next step.
No Replace differential oil temperature sensor, then go to Step
7.
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.
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.
A6E637027100204
B A
ACTION
M–79
M