Nissan Titan A60. Manual — part 433
EC-398
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P1574 ASCD VEHICLE SPEED SENSOR
BRC-24, "CONSULT-III Function (ABS)"
.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace.
3.
CHECK COMBINATION METER FUNCTION
Check combination meter function.
MWI-28, "CONSULT-III Function (METER/M&A)"
.
>> INSPECTION END
P1805 BRAKE SWITCH
EC-399
< DTC/CIRCUIT DIAGNOSIS >
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P1805 BRAKE SWITCH
Description
INFOID:0000000006158870
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.
On Board Diagnosis Logic
INFOID:0000000006158871
The MIL will not light up for this self-diagnosis.
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode.
DTC Confirmation Procedure
INFOID:0000000006158872
1. Turn ignition switch ON.
2. Fully depress the brake pedal for at least 5 seconds.
3. Erase the DTC with CONSULT-III.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000006158873
1.
CHECK STOP LAMP SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Check the stop lamp when depressing and releasing the brake pedal.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1805
1805
Brake switch
A brake switch signal is not sent to ECM for ex-
tremely long time while the vehicle is driving.
• Harness or connectors
(Stop lamp switch circuit is open or short-
ed.)
• Stop lamp switch
Engine operating condition in 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
Brake pedal
Stop lamp
Fully released
Not illuminated
Depressed
Illuminated
EC-400
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P1805 BRAKE SWITCH
1. Disconnect stop lamp switch harness connector.
2. Check voltage between stop lamp switch terminal 1 and ground
with CONSULT-III or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M31, E152
• Fuse block (J/B) connector M60
• 10A fuse
• Harness for open and short between stop lamp switch and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK STOP LAMP SWITCH
EC-401, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace stop lamp switch.
6.
CHECK INTERMITTENT INCIDENT
GI-36, "How to Check Terminal"
and
GI-39, "Intermittent Incident"
>> INSPECTION END
BBIA0373E
Voltage: Battery voltage
WBIA0545E
Continuity should exist.
P1805 BRAKE SWITCH
EC-401
< DTC/CIRCUIT DIAGNOSIS >
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Component Inspection
INFOID:0000000006158874
STOP LAMP SWITCH
1. Disconnect stop lamp switch harness connector.
2. Check continuity between stop lamp switch terminals 1 and 2
under the following conditions.
3. If NG, adjust stop lamp switch installation, refer to
"Inspection and Adjustment - Standard Pedal"
, and perform step
2 again.
BBIA0373E
Conditions
Continuity
Brake pedal: Fully released
Should not exist.
Brake pedal: Slightly depressed
Should exist.
WBIA0546E
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