Infiniti I30. Emission Control System (2003 year). Manual — part 39
Diagnostic Procedure
NHEC1465
1
CHECK ASCD STEERING SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch “ON”.
2. Select “MAIN SW”, “RESUME/ACC SW”, “SET SW” and “CANCEL SW” in “DATA MONITOR” mode with CONSULT-II.
SEC006D
3. Check each item indication under the following conditions.
MTBL1193
Without CONSULT-II
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 50 and ground with pressing each button.
SEC007D
MTBL1133
Refer to Wiring Diagram.
OK or NG
OK
䊳
GO TO 4.
NG
䊳
GO TO 2.
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DTC P1564 ASCD STEERING SWITCH
Diagnostic Procedure
EC-609
2
CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ASCD steering harness connector.
3. Check harness continuity between switch terminal 2 and ground. Refer to Wiring Diagram.
SEC198D
Continuity should exist.
4. Also check harness for short to power.
OK or NG
OK
䊳
GO TO 4.
NG
䊳
GO TO 3.
3
DETECT MALFUNCTIONING PART
Check the following.
쐌
Harness connectors M223, F53
쐌
Joint connector-20
쐌
Combination switch (spiral cable)
쐌
Harness for open and short between ECM and ASCD steering switch
䊳
Repair open circuit or short to power in harness or connectors.
4
CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 50 and ASCD steering switch terminal 1.
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 6.
NG
䊳
GO TO 5.
5
DETECT MALFUNCTIONING PART
Check the following.
쐌
Harness connectors M223, F53
쐌
Combination switch (spiral cable)
쐌
Harness for open and short between ECM and ASCD steering switch
䊳
Repair open circuit or short to ground or short to power in harness or connectors.
DTC P1564 ASCD STEERING SWITCH
Diagnostic Procedure (Cont’d)
EC-610
6
CHECK ASCD STEERING SWITCH
Refer to “Component Inspection”, EC-611.
OK or NG
OK
䊳
GO TO 7.
NG
䊳
Replace ASCD steering switch.
7
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.
䊳
INSPECTION END
SEC008D
Component Inspection
NHEC1215
ASCD STEERING SWITCH
1.
Disconnect ASCD steering switch.
2.
Check continuity between terminals 1 and 2 by pushing each
switch.
Switch
Condition
Resistance [
Ω
]
CRUISE SW
Pressed
Approx. 0
Released
Approx. 4,000
COAST/SET SW
Pressed
Approx. 660
Released
Approx. 4,000
ACCEL/RES SW
Pressed
Approx. 1,480
Released
Approx. 4,000
CANCEL SW
Pressed
Approx. 250
Released
Approx. 4,000
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DTC P1564 ASCD STEERING SWITCH
Diagnostic Procedure (Cont’d)
EC-611
SEC009D
Component Description
NHEC1466
When the brake pedal is depressed, ASCD brake switch is turned
OFF and stop lamp switch is turned ON.
ECM detects the state of the brake pedal by this input of two kinds
(ON/OFF signal).
Refer to EC-54 for the ASCD function.
CONSULT-II Reference Value in Data Monitor
Mode
NHEC1217
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
On Board Diagnosis Procedure
NHEC1467
The MIL will not light up for this self-diagnosis.
NOTE:
쐌
If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-435.
쐌
If DTC P1572 is displayed with DTC P1805, first perform the trouble diagnosis for DTC P1805. Refer
to EC-637.
DTC
Trouble diagnosis name
DTC Detecting Condition
Possible cause
P1572
1572
ASCD brake switch
쐌
When the vehicle speed is above
30 km/h (19 MPH), ON signal
from the stop lamp switch and
ASCD brake switch are sent to the
ECM at the same time.
쐌
ASCD brake switch signal is not
sent to ECM for an extremely long
time while driving vehicle.
쐌
Harness or connectors
(The stop lamp switch circuit is
open or shorted.)
쐌
Harness or connectors
(The ASCD brake switch circuit is
open or shorted.)
쐌
ASCD brake switch
쐌
Stop lamp switch
쐌
Harness or connectors
(The ASCD brake switch or stop
lamp switch circuit is open or
shorted.)
쐌
Incorrect stop lamp switch installa-
tion
쐌
Incorrect ASCD brake switch
installation
쐌
ECM
DTC P1572 ASCD BRAKE SWITCH
Component Description
EC-612
DTC Confirmation Procedure
NHEC1468
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
TESTING CONDITION:
Steps 3 and 4 may be conducted with the drive wheels lifted
in the shop or by driving the vehicle. If a road test is expected
to be easier, it is unnecessary to lift the vehicle.
SEC010D
With CONSULT-II
1)
Start engine (TCS switch “OFF”).
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Drive the vehicle for at least 5 consecutive seconds under the
following condition.
VHCL SPEED SE
More than 30 km/h (19 MPH)
Selector lever
Suitable position
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-616.
If 1st rip DTC is not detected, go to the following step.
4)
Drive the vehicle for at least 5 consecutive seconds under the
following condition.
VHCL SPEED SE
More than 30 km/h (19 MPH)
Selector lever
Suitable position
Driving location
Depress the brake pedal for more
than five seconds so as not to come
off from the above-mentioned condi-
tion.
5)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-616.
With GST
Follow the procedure “With CONSULT-II” above.
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DTC P1572 ASCD BRAKE SWITCH
DTC Confirmation Procedure
EC-613
Wiring Diagram
NHEC1221
MEC367E
DTC P1572 ASCD BRAKE SWITCH
Wiring Diagram
EC-614
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 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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DTC P1572 ASCD BRAKE SWITCH
Wiring Diagram (Cont’d)
EC-615
Diagnostic Procedure
NHEC1222
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.
DTC P1572 ASCD BRAKE SWITCH
Diagnostic Procedure
EC-616
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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DTC P1572 ASCD BRAKE SWITCH
Diagnostic Procedure (Cont’d)
EC-617
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 9.
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.
DTC P1572 ASCD BRAKE SWITCH
Diagnostic Procedure (Cont’d)
EC-618
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 12.
NG
䊳
GO TO 11.
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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DTC P1572 ASCD BRAKE SWITCH
Diagnostic Procedure (Cont’d)
EC-619
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 12.
12
DETECT MALFUNCTIONING PART
Check the following.
쐌
Harness connectors M15, E81
쐌
Harness connectors M162, F55
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
DTC P1572 ASCD BRAKE SWITCH
Diagnostic Procedure (Cont’d)
EC-620
SEC023D
SEC155D
Component Inspection
NHEC1223
ASCD BRAKE SWITCH AND STOP LAMP SWITCH
Condition
Continuity
ASCD brake
switch
Stop lamp switch
When brake pedal is depressed
No
Yes
When brake pedal is released
Yes
No
Check each switch after adjusting brake pedal — refer to BR
section.
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DTC P1572 ASCD BRAKE SWITCH
Component Inspection
EC-621
Component Description
NHEC1469
ECM receives vehicle speed signals via two different lines, and
detects vehicle speed for ASCD control.
Vehicle speed signals are input from combination meter and TCM
separately.
Signal from TCM is sent via CAN communication line.
Refer to EC-54 for ASCD functions.
On Board Diagnosis Procedure
NHEC1470
The MIL will not light up for this self-diagnosis.
NOTE:
쐌
If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC
U1000, U1001, refer to EC-159.
쐌
If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
to EC-422.
쐌
If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-435.
DTC
Trouble diagnosis name
DTC Detecting Condition
Possible cause
P1574
1574
ASCD vehicle speed sensor
ECM detects a difference values
between two vehicle speed signals if
they are out of the specified range.
쐌
Harness or connectors
(The CAN communication line is
open or shorted.)
쐌
Harness or connectors
(The combination meter circuit is
open or shorted.)
쐌
Combination meter
쐌
Vehicle speed sensor
쐌
TCM
쐌
ECM
DTC Confirmation Procedure
NHEC1471
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
TESTING CONDITION:
Step 3 may be conducted with the drive wheels lifted in the
shop or by driving the vehicle. If a road test is expected to be
easier, it is unnecessary to lift the vehicle.
SEF058Y
With CONSULT-II
1)
Start engine (TCS switch “OFF”).
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Drive the vehicle at more than 40 km/h (25 MPH).
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-625.
DTC P1574 ASCD VEHICLE SPEED SENSOR
Component Description
EC-622
With GST
Follow the procedure “With CONSULT-II” above.
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DTC P1574 ASCD VEHICLE SPEED SENSOR
DTC Confirmation Procedure (Cont’d)
EC-623
Wiring Diagram
NHEC1229
MEC368E
DTC P1574 ASCD VEHICLE SPEED SENSOR
Wiring Diagram
EC-624
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