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DTC P1564 ASCD STEERING SWITCH
Component Description INFOID:0000000004537415
ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation
of switch, and determines which button is operated.
Refer to EC-524 for the ASCD function.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004537416
Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004537417
This self-diagnosis has the on e trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to EC-872 .
1. ASCD steering switch 2. MAIN switch 3. CANCEL switch
4. RESUME/ACCELERATE switch 5. SET/COAST switch DTC No.
Trouble Diagnosis
Name DTC Detecting Condit
ion Possible Cause
P1564
1564 ASCD steering switch • An excessively high voltage signal from the
ASCD steering switch is sent to ECM.
• ECM detects that input signal from the
ASCD steering switch is out of the specified
range.
• ECM detects that the ASCD steering switch
is stuck ON. • Harness or connectors
(ASCD switch circuit is open or shorted.)
• ASCD steering switch
• ECM
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Wiring Diagram
INFOID:0000000004537419
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals wh en measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground ot her than ECM terminals, such as the ground. B
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![NISSAN LATIO 2009 Service Repair Manual EC-904< SERVICE INFOMATION >
[MR TYPE 1]
DTC P1564 ASCD STEERING SWITCH
Diagnosis Procedure INFOID:00000000045374201.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten grou NISSAN LATIO 2009 Service Repair Manual EC-904< SERVICE INFOMATION >
[MR TYPE 1]
DTC P1564 ASCD STEERING SWITCH
Diagnosis Procedure INFOID:00000000045374201.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten grou](/manual-img/5/57359/w960_57359-2259.png)
EC-904< SERVICE INFOMATION >
[MR TYPE 1]
DTC P1564 ASCD STEERING SWITCH
Diagnosis Procedure INFOID:00000000045374201.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screw on the body. Refer to EC-632, " Ground Inspection " .
OK or NG OK >> GO TO 2.
NG >> Repair or replace ground connections. 2.
CHECK ASCD STEERING SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch ON.
2. Select “MAIN SW”, “RESUME/ACC SW”, “SET SW and “CANCEL SW” in “DATA MONITOR” mode with
CONSULT-III.
3. Check each item indication under the following conditions. TERMI-
NAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
94 R ASCD steering switch [Ignition switch: ON]
• ASCD steering switch: OFF Approximately 4V
[Ignition switch: ON]
• MAIN switch: Pressed Approximately 0V
[Ignition switch: ON]
• CANCEL switch: Pressed Approximately 1V
[Ignition switch: ON]
• RESUME/ACCELERATE switch: Pressed Approximately 3V
[Ignition switch: ON]
• SET/COAST switch: Pressed Approximately 2V
95 B Sensor ground [Engine is running]
• Warm-up condition
• Idle speed Approximately 0V:
Vehicle front
1. Body ground E24 2. Engine ground F9 3. Engine ground F16
4. Body ground E15 BBIA0698E
Switch Monitor item Condition Indication
MAIN switch MAIN SW Pressed ON
Released OFF
CANCEL switch CANCEL SW Pressed ON
Released OFF
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Without CONSULT-III
1. Turn ignition switch ON.
2. Check voltage between ECM terminal 94 and ground with press- ing each button.
OK or NG OK >> GO TO 8.
NG >> GO TO 3. OK >> GO TO 5.
NG >> GO TO 4. Switch Condition Voltage [V]
MAIN switch Pressed Approx. 0
Released Approx. 4.0
CANCEL switch Pressed Approx. 1.0
Released Approx. 4.0
RESUME/ACCELER-
ATE switch Pressed Approx. 3.0
Released Approx. 4.0
SET/COAST switch Pressed Approx. 2.0
Released Approx. 4.0
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Component Inspection " .
OK or NG OK >> GO TO 8.
NG >> Replace ASCD steering switch. .
>> INSPECTION END
Component Inspection INFOID:0000000004537421
ASCD STEERING SWITCH
1. Disconnect combination switch (spiral cable) harness connector M31.
2. Check continuity between combination switch (spiral cable) ter- minals 14 and 15 with pushing each switch.
If NG, replace ASCD steering switch. Switch Condition Resistance [
Ω]
MAIN switch Pressed Approx. 0
Released Approx. 4,000
CANCEL switch Pressed Approx. 250
Released Approx. 4,000
RESUME/ACCELERATE
switch Pressed Approx. 1,480
Released Approx. 4,000
SET/COAST switch Pressed Approx. 660
Released Approx. 4,000
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DTC P1572 ASCD BRAKE SWITCH
Component Description INFOID:0000000004537422
When the brake pedal is depressed, ASCD brake switch (2) is
turned OFF and stop lamp switch (1) is turned ON. ECM detects the
state of the brake pedal by this input of two kinds (ON/OFF signal).
Refer to EC-524 for the ASCD function.
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004537423
Specification data are reference values.
On Board Diagnosis Logic INFOID:0000000004537424
This self-diagnosis has the on e trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
• If DTC P1572 is displayed with DT C P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-872 .
• This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not
stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when igniti on switch OFF. And even when ma lfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory. DTC No.
Trouble Diagnosis
Name DTC Detecting Condition Possible Cause
P1572
1572 ASCD brake switch A)
When the vehicle speed is above 30km/h (19
MPH), ON signals from the stop lamp switch
and the ASCD brake switch are sent to ECM
at the same time. • Harness or connectors
(Stop lamp switch circuit is shorted.)
• Harness or connectors (ASCD brake switch circuit is shorted.)
• Harness or connectors
(ASCD clutch switch circuit is shorted.)
(M/T)
• Stop lamp switch
• ASCD brake switch
• ASCD clutch switch (M/T)
• Incorrect stop lamp switch installation
• Incorrect ASCD brake switch installation
• Incorrect ASCD clutch switch installation (M/T)
• ECM
B)
ASCD brake switch signal is not sent to ECM
for extremely long time while the vehicle is
driving
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Diagnosis Procedure " .
If 1st trip DTC is not detec ted, go to the following step.
6. Drive the vehicle for at least 5 consecutive seconds under the following condition.
7. Check 1st trip DTC.
8. If 1st trip DTC is detected, go to EC-910, " Diagnosis Procedure " .
WITH GST
Follow the procedure “WITH CONSULT-III” above.