Infiniti Q45. Manual — part 495
DTC P1800 VIAS CONTROL SOLENOID VALVE
EC-619
C
D
E
F
G
H
I
J
K
L
M
A
EC
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.
Diagnostic Procedure
NBS0025N
1.
CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect VIAS control solenoid valve harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between VIAS control solenoid valve terminal 1
and ground with CONSULT-II or tester.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
29
PU
VIAS control solenoid valve
[Engine is running]
●
Selector lever: P or N
0 - 1.0V
[Engine is running]
●
Selector lever: D
●
Engine speed: Below 5,000 rpm
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●
Engine speed: Above 5,000 rpm
0 - 1.0V
111
W/B
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch: OFF]
●
For a few seconds after turning ignition
switch OFF
0 - 1.5V
[Ignition switch: OFF]
●
More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
119
120
R
R
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
PBIB2421E
Voltage: Battery voltage
PBIB0173E
EC-620
DTC P1800 VIAS CONTROL SOLENOID VALVE
2.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M135, F105
●
Harness for open or short between VIAS control solenoid valve and ECM relay
>> Repair harness or connectors.
3.
CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between ECM terminal 29 and VIAS control solenoid valve terminal 2.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK VIAS CONTROL SOLENOID VALVE
Refer to
EC-620, "Component Inspection"
OK or NG
OK
>> GO TO 5.
NG
>> Replace VIAS control solenoid valve.
5.
CHECK INTERMITTENT INCIDENT
Refer to
EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Component Inspection
NBS0025O
VIAS CONTROL SOLENOID VALVE
With CONSULT-II
1.
Reconnect harness connectors disconnected.
2.
Turn ignition switch ON.
3.
Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode.
4.
Check air passage continuity and operation delay time under the
following conditions.
Operation takes less than 1 second.
Continuity should exist.
Condition
VIAS SOL VALVE
Air passage continuity
between A and B
Air passage continuity
between A and C
ON
Yes
No
OFF
No
Yes
PBIB0177E
DTC P1800 VIAS CONTROL SOLENOID VALVE
EC-621
C
D
E
F
G
H
I
J
K
L
M
A
EC
Without CONSULT-II
Check air passage continuity and operation delay time under the fol-
lowing conditions.
Operation takes less than 1 second.
Removal and Installation
NBS0025P
VIAS CONTROL SOLENOID VALVE
Refer to
Condition
Air passage continuity
between A and B
Air passage continuity
between A and C
12V direct current supply
between terminals 1 and 2
Yes
No
No supply
No
Yes
MEC488B
EC-622
DTC P1805 BRAKE SWITCH
DTC P1805 BRAKE SWITCH
PFP:25320
Description
NBS0025Q
Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed.
This signal is used mainly to decrease the engine speed when the vehicle is driving.
CONSULT-II Reference Value in Data Monitor Mode
NBS0025R
Specification data are reference values.
On Board Diagnosis Logic
NBS0025S
The MIL will not light up for this diagnosis.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode.
DTC Confirmation Procedure
NBS0025T
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Fully depress the brake pedal for at least 5 seconds.
3.
Erase the DTC with CONSULT-II.
4.
Select “DATA MONITOR” mode with CONSULT-II.
5.
If 1st trip DTC is detected, go to
EC-624, "Diagnostic Procedure"
.
WITH GST
Follow the procedure WITH CONSULT-II above.
MONITOR ITEM
CONDITION
SPECIFICATION
BRAKE SW
●
Ignition switch: ON
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1805
1805
Brake switch
A brake switch signal is not sent to ECM for
extremely long time while the vehicle is driving.
●
Harness or connectors
(Stop lamp switch circuit is open or
shorted.)
●
Stop lamp switch
Engine operation condition in fail-fail safe mode
ECM controls the electric throttle control actuator by regulating the throttle opening to a small range.Therefore, acceleration will be
poor.
Vehicle condition
Driving condition
When engine is idling
Normal
When accelerating
Poor acceleration
PBIB1952E
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