Nissan Altima L32. Manual - part 566

P0850 PNP SWITCH

EC-1385

< COMPONENT DIAGNOSIS >

[VQ35DE]

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4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E3, F1

• Harness for open or short between PNP switch and ECM

>> Repair or replace harness or connectors.

9.

CHECK PNP SWITCH

Refer to 

TM-20, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 10

NO

>> Replace PNP switch.

10.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

>> Repair or replace malfunctioning part.

EC-1386

< COMPONENT DIAGNOSIS >

[VQ35DE]

P1148, P1168 CLOSED LOOP CONTROL

P1148, P1168 CLOSED LOOP CONTROL

DTC Logic

INFOID:0000000004362235

DTC DETECTION LOGIC

NOTE:

DTC P1148 or P1168 is displayed with another DTC for A/F sensor 1.

Perform the trouble diagnosis for the corresponding DTC.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1148

Closed loop control 
function (bank 1)

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

• Harness or connectors

(The sensor circuit is open or shorted.)

• A/F sensor 1
• A/F sensor 1 heater

P1168

Closed loop control 
function (bank 2)

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

P1212 TCS COMMUNICATION LINE

EC-1387

< COMPONENT DIAGNOSIS >

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P1212 TCS COMMUNICATION LINE

Description

INFOID:0000000004362239

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.

DTC Logic

INFOID:0000000004362240

DTC DETECTION LOGIC

NOTE:

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

Refer to 

EC-1179, "DTC Logic"

.

• If DTC P1212 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-1378, "DTC Logic"

.

Freeze frame data is not stored in the ECM for this self-diagnosis.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next test

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

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

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

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

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-1387, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004362241

Go to 

BRC-6, "Work Flow"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1212

TCS communication line

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

• Harness or connectors

(The CAN communication line is open or shorted.)

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

EC-1388

< COMPONENT DIAGNOSIS >

[VQ35DE]

P1217 ENGINE OVER TEMPERATURE

P1217 ENGINE OVER TEMPERATURE

DTC Logic

INFOID:0000000004362242

DTC DETECTION LOGIC

NOTE:

• If DTC P1217 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.

Refer to 

EC-1179, "DTC Logic"

.

• If DTC P1217 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-1378, "DTC Logic"

.

If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will

rise.

When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is

indicated.

CAUTION:

When a malfunction is indicated, always replace the coolant. Refer to 

CO-34, "System Inspection"

.

Also, replace the engine oil. Refer to 

LU-23, "Inspection"

.

1. Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Always use

coolant with the proper mixture ratio. Refer to 

MA-12, "Fluids and Lubricants"

.

2. After refilling coolant, run engine to ensure that no water-flow noise is emitted.

DTC CONFIRMATION PROCEDURE

1.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-1388, "Component Function Check"

.

NOTE:

Use component function check to check the overall function of the cooling fan. During this check, a DTC might

not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-1389, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000004362243

1.

PERFORM COMPONENT FUNCTION CHECK-I

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pres-

sure fluid escaping from the radiator.

Wrap a thick cloth around cap. Carefully remove the cap by turning it a quarter turn to allow built-up

pressure to escape. Then turn the cap all the way off.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1217

Engine over tempera-
ture (Overheat)

• Cooling fan does not operate properly (Over-

heat).

• Cooling fan system does not operate proper-

ly (Overheat).

• Engine coolant was not added to the system 

using the proper filling method.

• Engine coolant is not within the specified 

range.

• Harness or connectors

(The cooling fan circuit is open or shorted.)

• IPDM E/R (Cooling fan relays)
• Cooling fan motor
• Radiator hose
• Radiator
• Radiator  cap
• Water pump
• Thermostat