Infiniti FX35 / FX45. Manual - part 418

DTC P0850 PNP SWITCH

EC-433

< SERVICE INFORMATION >

[VQ35DE]

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1.

Disconnect TCM harness connector.

2.

Check harness continuity between A/T assembly terminal 9 and TCM terminal 8.
Refer to 

AT-97

.

3.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 7.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-717

.

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace.

8.

REPLACE “UNIFIED METER AND A/C AMP.”

Refer to 

DI-26

.

>> INSPECTION END

Continuity should exist.

EC-434

< SERVICE INFORMATION >

[VQ35DE]

DTC P1148, P1168 CLOSED LOOP CONTROL

DTC P1148, P1168 CLOSED LOOP CONTROL

On Board Diagnosis Logic

INFOID:0000000001326282

These self-diagnoses have the one trip detection logic.

NOTE:
DTC P1148 or P1168 is displayed with another DTC for air fuel ratio (A/F) sensor 1.
Perform the trouble diagnosis for the corresponding DTC.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1148
1148
(Bank 1)

Closed loop control 
function

The closed loop control function for bank 1 does 
not operate even when vehicle is driving in the 
specified condition.

• Harness or connectors

[Air fuel ratio (A/F) sensor 1 circuit is open 
or shorted.]

• Air fuel ratio (A/F) sensor 1
• Air fuel ratio (A/F) sensor 1 heater

P1168
1168
(Bank 2)

The closed loop control function for bank 2 does 
not operate even when vehicle is driving in the 
specified condition.

DTC P1211 TCS CONTROL UNIT

EC-435

< SERVICE INFORMATION >

[VQ35DE]

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DTC P1211 TCS CONTROL UNIT

Description

INFOID:0000000001326283

The malfunction information related to TCS is transferred through the CAN communication line from “ABS
actuator and electric unit (control unit)” to ECM.
Be sure to erase the malfunction information such as DTC not only for “ABS actuator and electric unit
(control unit)” but also for ECM after TCS related repair.

On Board Diagnosis Logic

INFOID:0000000001326284

Freeze frame data is not stored in the ECM for this self-diagnosis.
The MIL will not light up for this self-diagnosis.

DTC Confirmation Procedure

INFOID:0000000001326285

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5V at idle.

1.

Start engine and let it idle for at least 60 seconds.

2.

Check 1st trip DTC.

3.

If 1st trip DTC is detected, go to 

EC-435, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326286

Go to 

BRC-34

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1211
1211

TCS control unit

ECM receives a malfunction information from 
“ABS actuator and electric unit (Control unit)”.

• ABS actuator and electric unit (control 

unit)

• TCS related parts

EC-436

< SERVICE INFORMATION >

[VQ35DE]

DTC P1212 TCS COMMUNICATION LINE

DTC P1212 TCS COMMUNICATION LINE

Description

INFOID:0000000001326287

NOTE:
• If DTC P1212 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC

U1000, U1001. Refer to 

EC-146

.

• If DTC P1212 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer

to 

EC-148

.

This CAN communication line is used to control the smooth engine operation during the TCS operation. Pulse
signals are exchanged between ECM and “ABS actuator and electric unit (control unit)”.
Be sure to erase the malfunction information such as DTC not only for “ABS actuator and electric unit
(control unit)” but also for ECM after TCS related repair.

On Board Diagnosis Logic

INFOID:0000000001326288

Freeze frame data is not stored in the ECM for this self-diagnosis.
The MIL will not light up for this self-diagnosis.

DTC Confirmation Procedure

INFOID:0000000001326289

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5V at idle.

1.

Start engine and let it idle for at least 10 seconds.

2.

Check 1st trip DTC.

3.

If 1st trip DTC is detected, go to 

EC-436, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326290

Go to 

BRC-13

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1212
1212

TCS communication line

ECM can not receive the information from 
“ABS actuator and electric unit (control 
unit)”.

• Harness or connectors

(CAN communication line is open or shorted.)

• ABS actuator and electric unit (control unit)
• Dead (Weak) battery