Infiniti FX35, FX50 (S51). Manual - part 897

 

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Infiniti FX35, FX50 (S51). Manual - part 897

 

 

SNOW MODE SWITCH

EC-1129

< DTC/CIRCUIT DIAGNOSIS >

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SNOW MODE SWITCH

Description

INFOID:0000000005237644

The snow mode switch signal is sent to the “unified meter and A/C amp.” from the snow mode switch. The
“unified meter and A/C amp.” then sends the signal to the ECM via the CAN communication line.
The snow mode is used for driving or starting the vehicle on snowy roads or slippery areas. If the snow mode
is activated, the vehicle speed will not accelerate as quickly as normal to avoid vehicle slip. In other words,
ECM controls rapid engine torque change by controlling the electric throttle control actuator operating speed.

Component Function Check

INFOID:0000000005237645

1.

CHECK SNOW MODE SWITCH FUNCTION

NOTE:
If DTC UXXXX are displayed, first perform the trouble diagnosis for DTC UXXXX.
1.

Turn ignition switch ON.

2.

Select “SNOW MODE SW” in “DATA MONITOR” mode with CONSULT-III.

3.

Check “SNOW MODE SW” indication under the following conditions.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

EC-1129, "Diagnosis Procedure"

.

2.

CHECK SNOW MODE INDICATOR FUNCTION

1.

Turn ignition switch ON.

2.

Check the snow mode indicator in the snow mode switch under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-1129, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005237646

1.

CHECK SNOW MODE SWITCH OVERALL FUNCTION-I

Confirm the malfunctioning circuit (snow mode switch or snow mode indicator). Refer to 

EC-1129, "Compo-

nent Function Check"

.

Which circuit is related to the incident?

Snow mode switch>>GO TO 2.
Snow mode indicator>>GO TO 6.

2.

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Refer to 

MWI-45, "CONSULT-III Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Go to 

MWI-4, "Work flow"

.

3.

CHECK SNOW MODE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect snow mode switch harness connector.

Monitor item

Condition

Indication

SNOW MODE SW

Snow mode switch

ON

ON

OFF

OFF

Condition

Snow mode indicator

Snow mode switch

ON

ON

OFF

OFF

EC-1130

< DTC/CIRCUIT DIAGNOSIS >

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SNOW MODE SWITCH

3.

Turn ignition switch ON.

4.

Check the voltage between snow mode switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E106, M6
• IPDM E/R harness connector E7
• 10 A fuse (No. 43)
• Harness for open or short between snow mode switch and fuse.

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

5.

CHECK SNOW MODE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect “unified meter and A/C amp.” harness connector.

3.

Check the continuity between snow mode switch harness connector and “unified meter and A/C amp.”
harness connector.

4.

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

Is the inspection result normal?

YES

>> GO TO 8.

NO

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

6.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-39, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace ground connection.

7.

CHECK SNOW MODE INDICATOR LAMP GROUND CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between snow mode switch harness connector and ground.

2.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 8.

NO

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

8.

CHECK SNOW MODE SWITCH

Refer to 

EC-1131, "Component Inspection"

.

Is the inspection result normal?

Snow mode switch

Ground

Voltage

Connector

Terminal

M176

1

Ground

Battery voltage

Snow mode switch

Unified meter and A/C amp.

Continuity

Connector

Terminal

Connector

Terminal

M176

4

M66

23

Existed

Snow mode switch

Ground

Continuity

Connector

Terminal

M176

2

Ground

Existed

SNOW MODE SWITCH

EC-1131

< DTC/CIRCUIT DIAGNOSIS >

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YES

>> GO TO 9.

NO

>> Replace snow mode switch.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005237647

1.

CHECK SNOW MODE SWITCH-I

1.

Turn ignition switch OFF.

2.

Disconnect snow mode switch harness connector.

3.

Check the continuity between snow mode switch terminals under the following conditions.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace snow mode switch.

2.

CHECK SNOW MODE SWITCH-II

Check the continuity between snow mode switch terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace snow mode switch.

Terminals

Condition

Continuity

1 and 4

Snow mode switch

ON

Existed

OFF

Not Existed

Terminals (Polarity)

Continuity

2 (+) - 4 (–)

Existed

4 (+) - 2 (–)

Not Existed

EC-1132

< ECU DIAGNOSIS INFORMATION >

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ECM

ECU DIAGNOSIS INFORMATION

ECM

Reference Value

INFOID:0000000005237648

VALUES ON THE DIAGNOSIS TOOL

NOTE:
• Specification data are reference values.
• Specification data are output/input values which are detected or supplied by the ECM at the connector.

* Specification data may not be directly related to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show
the specification data in spite of the ignition timing not being adjusted to the specification data. This IGN TIM-
ING monitors the data calculated by the ECM according to the signals input from the camshaft position sen-
sor and other ignition timing related sensors.

CONSULT-III MONITOR ITEM

Monitor Item

Condition

Values/Status

ENG SPEED

• Run engine and compare CONSULT-III value with the tachometer indication.

Almost the same speed as 
the tachometer indication

MAS A/F SE-B1

See 

EC-728, "Description"

.

MAS A/F SE-B2

See 

EC-728, "Description"

.

B/FUEL SCHDL

See 

EC-728, "Description"

.

A/F ALPHA-B1

See 

EC-728, "Description"

.

A/F ALPHA-B2

See 

EC-728, "Description"

.

COOLAN TEMP/S

• Ignition switch: ON

Indicates engine coolant 
temperature

A/F SEN1 (B1)

• Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 2.2 V

A/F SEN1 (B2)

• Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 2.2 V

HO2S2 (B1)

• Revving engine from idle up to 3,000 rpm quickly after the following condi-

tions are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and 

at idle for 1 minute under no load

0 - 0.3 V 

←→

 Approx. 0.6 - 

1.0 V

HO2S2 (B2)

• Revving engine from idle up to 3,000 rpm quickly after the following condi-

tions are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and 

at idle for 1 minute under no load

0 - 0.3 V 

←→

 Approx. 0.6 - 

1.0 V

HO2S2 MNTR (B1)

• Revving engine from idle up to 3,000 rpm quickly after the following condi-

tions are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and 

at idle for 1 minute under no load

LEAN 

←→

 RICH

HO2S2 MNTR (B2)

• Revving engine from idle up to 3,000 rpm quickly after the following condi-

tions are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and 

at idle for 1 minute under no load

LEAN 

←→

 RICH

VHCL SPEED SE

• Turn drive wheels and compare CONSULT-III value with the speedometer in-

dication.

Almost the same speed as 
speedometer indication

BATTERY VOLT

• Ignition switch: ON (Engine stopped)

11 - 14 V

ACCEL SEN 1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.45 - 1.0 V

Accelerator pedal: Fully depressed

4.4 - 4.8 V

ACCEL SEN 2*

1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.45 - 1.0 V

Accelerator pedal: Fully depressed

4.3 - 4.8 V

 

 

 

 

 

 

 

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