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Infiniti I30. Emission Control System (2003 year). Manual - part 45

System Description

NHEC1328

Sensor

Input Signal to ECM

ECM func-

tion

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed

Engine
mount con-
trol

Electronic controlled engine
mount

Wheel sensor

Vehicle speed

The ECM controls the engine mount operation corresponding to
the engine speed and the vehicle speed. The control system has
2-step control [soft/hard].

Vehicle condition

Engine mount control

Idle (with vehicle stopped)

Soft

Driving

Hard

CONSULT-II Reference Value in Data Monitor
Mode

NHEC1329

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

ENGINE MOUNT

쐌

Engine: Running

Idle (With vehicle stopped)

“IDLE”

Except above conditions

“TRVL”

IDX

ELECTRONIC CONTROLLED ENGINE MOUNT

System Description

EC-705

Wiring Diagram

NHEC1330

MEC372E

SEF640XD

ELECTRONIC CONTROLLED ENGINE MOUNT

Wiring Diagram

EC-706

Diagnostic Procedure

NHEC1331

CHECK THE OVERALL FUNCTION

With CONSULT-II

1. After warming up engine, run it at idle speed.
2. Shift selector lever to “D” range while depressing the brake pedal and pulling the parking brake control lever.
3. Perform “ENGINE MOUNTING” in “ACTIVE TEST” mode with CONSULT-II and check that the body vibration changes

according to switching the condition (With vehicle stopped).

SEC237C

Without CONSULT-II

1. After warming up engine, run it at idle speed.
2. Shift selector lever to “D” range while depressing the brake pedal and pulling the parking brake control lever.
3. Disconnect front or rear electronic controlled engine mount harness connector when engine speed is more than 1,000

rpm.

4. When returning engine speed to idle speed, check that the body vibration increases, compared with the condition of the

above step 2 (With vehicle stopped).

OK or NG

䊳

INSPECTION END

䊳

GO TO 2.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT POWER SUPPLY CIRCUIT

1. Turn ignition switch “OFF”.
2. Disconnect front or rear electronic controlled engine mount harness connector.
3. Check voltage between electronic controlled engine mount terminal 3 and ground with CONSULT-II or tester.

SEF899X

OK or NG

䊳

GO TO 4.

䊳

GO TO 3.

IDX

ELECTRONIC CONTROLLED ENGINE MOUNT

Diagnostic Procedure

EC-707

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors E15, F18

쐌

15A fuse

쐌

Joint connector-13

쐌

Harness for open or short between electronic controlled engine mount and battery

䊳

Repair harness or connectors.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT OUTPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 4 and electronic controlled engine mount terminal 1, ECM terminal 14

and electronic controlled engine mount terminal 2. Refer to Wiring Diagram.

Continuity should exist.

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

OK or NG

䊳

GO TO 5.

䊳

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

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT

Visually check front and rear electronic controlled engine mount.

OK or NG

䊳

GO TO 6.

䊳

Replace front or rear engine mount assembly.

CHECK INTERMITTENT INCIDENT

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

䊳

INSPECTION END

ELECTRONIC CONTROLLED ENGINE MOUNT

Diagnostic Procedure (Cont’d)

EC-708

SEC084D

Description

NHEC0636

The refrigerant pressure sensor is installed at the liquid tank of the
air conditioner system. The sensor uses an electrostatic volume
pressure transducer to convert refrigerant pressure to voltage. The
voltage signal is sent to ECM, and ECM controls cooling fan sys-
tem.

SEF099XA

IDX

REFRIGERANT PRESSURE SENSOR

Description

EC-709

Wiring Diagram

NHEC0637

MEC569D

SEF643XE

REFRIGERANT PRESSURE SENSOR

Wiring Diagram

EC-710

Diagnostic Procedure

NHEC0638

CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION

1. Start engine and warm it up to normal operating temperature.
2. Turn A/C switch and blower switch “ON”.
3. Check voltage between ECM terminal 81 and ground with CONSULT-II or tester.

SEF617XA

OK or NG

䊳

INSPECTION END

䊳

GO TO 2.

CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT

1. Turn A/C switch and blower switch “OFF”.
2. Stop engine.
3. Disconnect refrigerant pressure sensor harness connector.

SEC084D

4. Turn ignition switch “ON”.
5. Check voltage between refrigerant pressure sensor terminal 1 and ground with CONSULT-II or tester.

SEF618X

OK or NG

䊳

GO TO 4.

䊳

GO TO 3.

IDX

REFRIGERANT PRESSURE SENSOR

Diagnostic Procedure

EC-711

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors E15, F18

쐌

Harness for open or short between ECM and refrigerant pressure sensor

䊳

Repair harness or connectors.

CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Check harness continuity between refrigerant pressure sensor terminal 3 and engine ground. Refer to Wiring Diagram.

Continuity should exist.

3. Also check harness for short to power.

OK or NG

䊳

GO TO 6.

䊳

GO TO 5.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors E8, F17

쐌

Harness for open between ECM and refrigerant pressure sensor

쐌

Harness for open between TCM (Transmission control module) and refrigerant pressure sensor

䊳

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

CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 81 and refrigerant pressure sensor terminal 2. Refer to Wiring Dia-

gram.

Continuity should exist.

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

OK or NG

䊳

GO TO 8.

䊳

GO TO 7.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors E8, F17

쐌

Harness for open or short between ECM and refrigerant pressure sensor

䊳

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

CHECK REFRIGERANT PRESSURE SENSOR

Refer to HA-14, “Refrigerant pressure sensor”.

OK or NG

䊳

GO TO 9.

䊳

Replace refrigerant pressure sensor.

CHECK INTERMITTENT INCIDENT

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

䊳

INSPECTION END

REFRIGERANT PRESSURE SENSOR

Diagnostic Procedure (Cont’d)

EC-712

SEC009D

Component Description

NHEC1232

When depressing the brake pedal, ASCD brake switch is turned
OFF and stop lamp switch is turned ON.
ECM detects the state of the brake pedal by this two kinds of input
(ON/OFF signal).
Refer to EC-54 for the ASCD function.

CONSULT-II Reference Value in Data Monitor
Mode

NHEC1233

CONSULT-II Reference Value in Data Monitor Mode Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

BRAKE SW 1
(ASCD brake switch)

쐌

Ignition switch: ON

쐌

Shift lever:
Except “N” and “P” position

쐌

Brake pedal released

쐌

Brake pedal depressed

OFF

BRAKE SW 2
(Stop lamp switch)

쐌

Ignition switch: ON

쐌

Brake pedal released

OFF

쐌

Brake pedal depressed

IDX

ASCD BRAKE SWITCH

Component Description

EC-713

Wiring Diagram

NHEC1237

MEC373E

ASCD BRAKE SWITCH

Wiring Diagram

EC-714

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.

TERMI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

R/G

Stop lamp switch

[Ignition switch “ON”]

쐌

Brake pedal is fully released

Approximately 0V

[Ignition switch “ON”]

쐌

Brake pedal is depressed

BATTERY VOLTAGE
(11 - 14V)

G/B

ASCD brake switch

[Ignition switch “ON”]

쐌

Brake pedal is released

BATTERY VOLTAGE
(11 - 14V)

[Ignition switch “ON”]

쐌

Brake pedal is depressed

Approximately 0V

IDX

ASCD BRAKE SWITCH

Wiring Diagram (Cont’d)

EC-715

Diagnostic Procedure

NHEC1238

CHECK OVERALL FUNCTION-I

With CONSULT-II

1. Turn ignition switch “ON”.
2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-II.
3. Check the indication of “BRAKE SW1” under the following conditions.

SEC011D

MTBL1557

Without CONSULT-II

1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 59 and ground under the following conditions.

SEC012D

MTBL1558

Refer to Wiring Diagram.

OK or NG

䊳

GO TO 2.

䊳

GO TO 3.

ASCD BRAKE SWITCH

Diagnostic Procedure

EC-716

CHECK OVERALL FUNCTION-II

With CONSULT-II

See “BRAKE SW2” indication in “DATA MONITOR” mode.

SEC013D

MTBL1336

Without CONSULT-II

Check voltage between ECM terminal 55 and ground under the following conditions.

SEC014D

MTBL1337

Refer to Wiring Diagram.

OK or NG

䊳

GO TO 14.

䊳

GO TO 9.

IDX

ASCD BRAKE SWITCH

Diagnostic Procedure (Cont’d)

EC-717

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch “OFF”.
2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.

PBIB0857E

Voltage: Battery voltage

OK or NG

䊳

GO TO 5.

䊳

GO TO 4.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Fuse block (J/B) connector E83

쐌

10A fuse

쐌

Harness for open or short between ASCD brake switch and fuse

䊳

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

CHECK ASCD BRAKE SWITCH INPUT CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 59 and ASCD brake switch terminal 2.

Refer to Wiring Diagram.

Continuity should exist.

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

OK or NG

䊳

GO TO 7.

䊳

GO TO 6.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors E81, M15

쐌

Harness connectors M223, F53

쐌

Harness for open and short between ECM and ASCD brake switch

䊳

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

ASCD BRAKE SWITCH

Diagnostic Procedure (Cont’d)

EC-718

CHECK ASCD BRAKE SWITCH

Refer to “Component Inspection”, EC-621.

OK or NG

䊳

GO TO 8.

䊳

Replace ASCD brake switch.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors E81, M15

쐌

Harness connectors M223, F53

쐌

Harness for open and short between ASCD clutch switch and ECM

䊳

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

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch “OFF”.
2. Disconnect stop lamp switch harness connector.
3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.

PBIB0117E

Voltage: Battery voltage

OK or NG

䊳

GO TO 11.

䊳

GO TO 10.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Fuse block (J/B) connector M17

쐌

15A fuse

쐌

Harness connectors M15, E81

쐌

Harness for open or short between stop lamp switch and fuse

䊳

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

IDX

ASCD BRAKE SWITCH

Diagnostic Procedure (Cont’d)

EC-719

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.
2. Check harness continuity between stop lamp switch terminal 2 and ECM terminal 55.

SEC216D

Continuity should exist

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

OK or NG

䊳

GO TO 13.

䊳

GO TO 14.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors M15, E81

쐌

Harness connectors M223, F53

쐌

Harness for open or short between stop lamp switch and ECM

䊳

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

CHECK STOP LAMP SWITCH

Refer to “Component Inspection”, EC-621.

OK or NG

䊳

GO TO 14.

䊳

Replace stop lamp switch.

CHECK INTERMITTENT INCIDENT

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

䊳

INSPECTION END

ASCD BRAKE SWITCH

Diagnostic Procedure (Cont’d)

EC-720

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