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”
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ELECTRONIC CONTROLLED ENGINE MOUNT
System Description
EC-705
Wiring Diagram
NHEC1330
MEC372E
SEF640XD
ELECTRONIC CONTROLLED ENGINE MOUNT
Wiring Diagram
EC-706
Diagnostic Procedure
NHEC1331
1
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
OK
䊳
INSPECTION END
NG
䊳
GO TO 2.
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
OK
䊳
GO TO 4.
NG
䊳
GO TO 3.
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ELECTRONIC CONTROLLED ENGINE MOUNT
Diagnostic Procedure
EC-707
3
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.
4
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
OK
䊳
GO TO 5.
NG
䊳
Repair open circuit, short to ground or short to power in harness connectors.
5
CHECK ELECTRONIC CONTROLLED ENGINE MOUNT
Visually check front and rear electronic controlled engine mount.
OK or NG
OK
䊳
GO TO 6.
NG
䊳
Replace front or rear engine mount assembly.
6
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
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REFRIGERANT PRESSURE SENSOR
Description
EC-709
Wiring Diagram
NHEC0637
MEC569D
SEF643XE
REFRIGERANT PRESSURE SENSOR
Wiring Diagram
EC-710
Diagnostic Procedure
NHEC0638
1
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
OK
䊳
INSPECTION END
NG
䊳
GO TO 2.
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
OK
䊳
GO TO 4.
NG
䊳
GO TO 3.
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REFRIGERANT PRESSURE SENSOR
Diagnostic Procedure
EC-711
3
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.
4
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
OK
䊳
GO TO 6.
NG
䊳
GO TO 5.
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.
6
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
OK
䊳
GO TO 8.
NG
䊳
GO TO 7.
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.
8
CHECK REFRIGERANT PRESSURE SENSOR
Refer to HA-14, “Refrigerant pressure sensor”.
OK or NG
OK
䊳
GO TO 9.
NG
䊳
Replace refrigerant pressure sensor.
9
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
ON
쐌
Brake pedal depressed
OFF
BRAKE SW 2
(Stop lamp switch)
쐌
Ignition switch: ON
쐌
Brake pedal released
OFF
쐌
Brake pedal depressed
ON
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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)
55
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)
59
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
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ASCD BRAKE SWITCH
Wiring Diagram (Cont’d)
EC-715
Diagnostic Procedure
NHEC1238
1
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
OK
䊳
GO TO 2.
NG
䊳
GO TO 3.
ASCD BRAKE SWITCH
Diagnostic Procedure
EC-716
2
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
OK
䊳
GO TO 14.
NG
䊳
GO TO 9.
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ASCD BRAKE SWITCH
Diagnostic Procedure (Cont’d)
EC-717
3
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
OK
䊳
GO TO 5.
NG
䊳
GO TO 4.
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.
5
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
OK
䊳
GO TO 7.
NG
䊳
GO TO 6.
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
7
CHECK ASCD BRAKE SWITCH
Refer to “Component Inspection”, EC-621.
OK or NG
OK
䊳
GO TO 8.
NG
䊳
Replace ASCD brake switch.
8
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.
9
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
OK
䊳
GO TO 11.
NG
䊳
GO TO 10.
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.
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ASCD BRAKE SWITCH
Diagnostic Procedure (Cont’d)
EC-719
11
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
OK
䊳
GO TO 13.
NG
䊳
GO TO 14.
12
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.
13
CHECK STOP LAMP SWITCH
Refer to “Component Inspection”, EC-621.
OK or NG
OK
䊳
GO TO 14.
NG
䊳
Replace stop lamp switch.
14
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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