Nissan Terrano model r20 series 2004. Manual — part 175
Diagnostic Procedure
INSPECTION START
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Disconnect ECM harness connector
and combination meter harness con-
nector.
3. Check harness continuity between
ECM connector terminal
417
and
combination meter connector terminal
q
26
. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
I
Harness for open or
short-circuit between
ECM and combination
meter
If NG, repair harness or
connectors.
CHECK SPEEDOMETER FUNCTION.
Make sure that speedometer functions
properly.
OK
E
NG
Check the following:
I
Harness for open or
short-circuit between
combination meter and
vehicle speed sensor
If NG, repair harness or
connectors.
Check vehicle speed sen-
sor and its circuit.
Refer to EL section.
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage and
check the connection of ECM harness
connector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
H
H
H
H
H
DTC P0500 VEHICLE SPEED SEN
TD27Ti
EC-422
Component Description
BRAKE SWITCH
The ECM receives signals from two brake switches. One is a con-
ventional brake lamp switch, the other is referred to as a redundant
brake switch 2.
In case the accelerator pedal does not return to the idle position
(pedal sticks), the driver will react by depressing the brake. In this
(emergency) situation, the ECM will disregard the accelerator pedal
signal and bring back the engine speed to 1,200 rpm.
On Board Diagnosis Logic
DTC
Malfunction is detected when ...
Check Items
(Possible Cause)
P0571
0807
I
Brake switch circuits are open or shorted.
I
Harness or connectors
(Brake switch circuits are open or shorted.)
I
Stop lamp switch
I
Brake switch 2
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch to “ON” position and select “DATA MONI-
TOR” mode with CONSULT-II.
2) Depress brake pedal for at least 1 minute.
WITHOUT CONSULT-II
1) Turn ignition switch to “ON” position.
2) Depress brake pedal for at least 1 minute.
3) Turn ignition switch to “LOCK” position, wait at least 5 seconds
and then turn to “ON” position.
4) Perform “Diagnostic Test Mode II” (Self-diagnostic results).
DTC P0571 BRAKE SW
TD27Ti
EC-423
Wiring Diagram
YEC148A
DTC P0571 BRAKE SW
TD27Ti
EC-424
Diagnostic Procedure
INSPECTION START
(Stop lamp switch circuit)
CHECK POWER SUPPLY.
1. Turn ignition switch to “LOCK” position.
2. Disconnect stop lamp switch harness
connector.
3. Check voltage between stop lamp
switch harness connector terminal
q
1
and engine ground.
Voltage: Battery voltage
OK
E
NG
Check the following:
I
15A fuse
I
Harness for open or
short-circuit between
fuse block and stop
lamp switch
If NG, repair harness or
connectors.
CHECK STOP LAMP SWITCH INPUT
SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between
ECM connector terminal
405
and stop
lamp switch terminal
q
2
. Refer to wiring
diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Repair harness or connec-
tors.
CHECK BRAKE SWITCH INPUT SIGNAL
CIRCUIT.
1. Disconnect brake switch harness con-
nector.
2. Check harness continuity between
brake switch terminal
q
2
and ECM ter-
minal
416
. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Repair harness or connec-
tors.
CHECK GROUND CIRCUIT.
1. Check harness continuity between
brake switch terminal
q
1
and ground.
Refer to wiring diagram.
Continuity should exist.
If OK, reconnect harness connectors.
OK
E
NG
Repair harness or connec-
tors.
CHECK COMPONENT.
(Stop lamp switch and brake switch)
Refer to “COMPONENT INSPECTION”,
EC-426.
OK
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage and
check the connection of ECM harness
connector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
MEC952D
H
H
H
H
H
H
H
H
DTC P0571 BRAKE SW
TD27Ti
EC-425
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