Mazda CX 7. Manual - part 172

 

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Mazda CX 7. Manual - part 172

 

 

ON-BOARD DIAGNOSTIC 

03-02–3

03-02

DTC P1887

id030200800300

DTC

P1887

AWD solenoid circuit

DETECTION 

CONDITION

• Current detection circuit in AWD CM detects current above specification for more than specified period.

• AWD CM detects that AWD 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 AWD CM terminal K

• Open circuit or short to GND between AWD CM terminal O and AWD solenoid terminal B

• Open circuit or short to GND between AWD CM terminal P and AWD solenoid terminal A

• Open circuit between AWD CM terminal N and body GND

• Open or short circuit in AWD CM internal circuit

• ENG B+ (25A) fuse malfunction

• AWD solenoid malfunction

• AWD CM malfunction

• Poor connection of connectors (female terminals)

A
B

C
D

E
F

G
H

I
J

K
L

M

N

O

P

K 

O B 

A 

N 

P 

BATTERY

FUSE (ENG B+ (25A))

AWD CM

AWD CM CONNECTOR

AWD SOLENOID

AWD SOLENOID CONNECTOR

RELAY

A

B

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ON-BOARD DIAGNOSTIC 

03-02–4

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

INSPECT AWD SOLENOID CONDITION

• Turn ignition key to OFF.

• Disconnect AWD solenoid connector.

• Inspect AWD solenoid.

(See 03-19-11 AWD SOLENOID 
INSPECTION)

• Is it okay?

Yes

Go to next step.

No

Replace AWD solenoid, then go to Step 7.

2

INSPECT AWD SOLENOID TO AWD CM 
(POWER SUPPLY CIRCUIT) FOR OPEN 
CIRCUIT

• Disconnect AWD CM connector.

• Inspect for continuity between AWD CM 

terminal O and AWD solenoid terminal B.

• Is there continuity?

Yes

Go to next step.

No

Repair or replace harness for open circuit between AWD 
CM and AWD solenoid, then go to Step 7.

3

INSPECT AWD SOLENOID TO AWD CM 
(POWER SUPPLY CIRCUIT) FOR SHORT TO 
GROUND

• Inspect for continuity between AWD CM 

terminal O and ground.

• Is there continuity?

Yes

Repair or replace harness for short to ground between AWD 
CM and AWD solenoid, then go to Step 7.

No

Go to next step.

4

INSPECT AWD SOLENOID TO AWD CM 
(GROUND CIRCUIT) FOR OPEN CIRCUIT

• Inspect for continuity between AWD CM 

terminal P and AWD solenoid terminal A.

• Is there continuity?

Yes

Go to next step.

No

Repair or replace harness for open circuit between AWD 
CM and AWD solenoid, then go to Step 7.

5

INSPECT AWD SOLENOID TO AWD CM 
(GROUND CIRCUIT) FOR SHORT TO 
GROUND

• Inspect for continuity between AWD CM 

terminal P and ground.

• Is there continuity?

Yes

Repair or replace harness for short to ground between AWD 
CM and AWD solenoid, then go to Step 7.

No

Go to next step.

6

INSPECT AWD CM POWER SUPPLY CIRCUIT 
FOR OPEN CIRCUIT

• Measure voltage between AWD CM terminal 

K and ground.

• Is voltage B+?

Yes

Replace AWD CM, then go to Step 7.

No

Repair or replace harness for open circuit between AWD 
CM and AWD solenoid, then go to next step.

7

INSPECT FUSE CONDITION

• Turn ignition key to OFF.

• Is ENG B+ (25A) fuse okay?

Yes

Go to next step.

No

Replace fuse, then go to Step 9.

8

VERIFY TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Clear DTC from memory.

(See 03-02-2 ELECTRONIC AWD 
CONTROL SYSTEM ON-BOARD 
DIAGNOSIS)

• Drive vehicle.

• Is the same DTC present?

Yes

Replace AWD CM, then go to next step.

No

Go to next step.

9

VERIFY AFTER REPAIR PROCEDURE

• Is there any other DTC present?

Yes

Go to applicable DTC inspection.

No

Troubleshooting completed.

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ON-BOARD DIAGNOSTIC 

03-02–5

03-02

DTC P1888

id030200800400

DTC

P1888

Differential oil temperature sensor circuit

DETECTION 

CONDITION

• Differential oil temperature sensor voltage monitor circuit detects abnormal input voltage.

POSSIBLE 

CAUSE

• Open circuit, or short to battery or GND between AWD CM terminal A and differential oil temperature 

sensor terminal A

• Open circuit or short to battery between AWD CM terminal C and differential oil temperature sensor 

terminal B

• Differential oil temperature sensor malfunction

• AWD CM malfunction

• Poor connection of connectors (female terminals)

A

B

A
B

C
D

E
F

G
H

I
J

K
L

M

N

O

P

A 

C 

A 

B 

AWD CM CONNECTOR

AWD CM

DIFFERENTIAL OIL
TEMPERATURE SENSOR

DIFFERENTIAL OIL TEMPERATURE
SENSOR CONNECTOR

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ON-BOARD DIAGNOSTIC 

03-02–6

Diagnostic procedure

End Of Sie

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 AWD CM TO DIFFERENTIAL OIL 
TEMPERATURE SENSOR FOR OPEN 
CIRCUIT

• Disconnect AWD CM connector.

• Inspect for continuity between AWD 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 AWD 
CM and differential oil temperature sensor, then go to Step 
7.

3

INSPECT AWD CM TO DIFFERENTIAL OIL 
TEMPERATURE SENSOR FOR SHORT TO 
POWER

• Inspect voltage between AWD CM terminal A 

and ground.

• Is voltage B+?

Yes

Repair or replace harness for short to power between AWD 
CM and differential oil temperature sensor, then go to Step 
7.

No

Go to next step.

4

INSPECT AWD CM TO DIFFERENTIAL OIL 
TEMPERATURE SENSOR FOR SHORT TO 
GROUND

• Inspect for continuity between AWD CM 

terminal A and ground.

• Is there continuity?

Yes

Repair or replace harness for short to ground between AWD 
CM and differential oil temperature sensor, then go to Step 
7.

No

Go to next step.

5

INSPECT AWD CM TO DIFFERENTIAL OIL 
TEMPERATURE SENSOR FOR OPEN 
CIRCUIT

• Inspect for continuity between AWD CM 

terminal C and differential oil temperature 
sensor terminal B.

• Is there continuity?

Yes

Go to next step.

No

Repair or replace harness for open circuit between AWD 
CM and differential oil temperature sensor, then go to Step 
7.

6

INSPECT AWD CM TO DIFFERENTIAL OIL 
TEMPERATURE SENSOR FOR SHORT TO 
GROUND

• Inspect voltage between AWD CM terminal 

C and ground.

• Is voltage B+?

Yes

Repair or replace harness for short to power between AWD 
CM and differential oil temperature sensor, then go to next 
step.

No

Replace AWD CM, then go to next step.

7

VERIFY TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Clear DTC from memory.

(See 03-02-2 ELECTRONIC AWD 
CONTROL SYSTEM ON-BOARD 
DIAGNOSIS)

• Drive vehicle.

• Is the same DTC present?

Yes

Replace AWD CM, then go to next step.

No

Go to next step.

8

VERIFY AFTER REPAIR PROCEDURE

• Is there any other DTC present?

Yes

Go to applicable DTC inspection.

No

Troubleshooting completed.

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