Nissan Terrano r20e. Instruction — part 191
Wiring Diagram
YEC148A
DTC P0571 BRAKE SW
TD27Ti
EC-401
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-403.
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-402
Component Inspection
STOP LAMP SWITCH AND BRAKE SWITCH 2
1. Turn ignition switch to “LOCK” position.
2. Disconnect switch connectors.
3. Check continuity between terminals
q
1
and
q
2
.
Continuity:
Brake pedal
Stop lamp switch
Brake switch 2
Released
No
No
Depressed
Yes
Yes
If NG, replace stop lamp switch or brake switch.
MEC968D
DTC P0571 BRAKE SW
TD27Ti
EC-403
Component Description
Malfunction Indicator (MI) is located on the instrument panel. When the ignition switch is turned ON without
engine running, MI will light up. This is a bulb check. When the engine is started, MI should go off. If MI remains
on, the on board diagnostic system has detected an engine system malfunction.
On Board Diagnosis Logic
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0650
0907
Malfunction indicator (MI) control cir-
cuit
I
An excessively high voltage is sent
to ECM through the MI circuit
under the condition that calls for MI
light up.
I
An excessively low voltage is sent
to ECM through the MI circuit
under the condition that calls for MI
not to light up.
I
Harness or connectors
(MI circuit is open or shorted.)
I
MI
DTC Confirmation Procedure
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.
WITH CONSULT-II
1. Turn ignition switch “ON”.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for 2 second.
WITHOUT CONSULT-II
1. Turn ignition switch “ON”.
2. Perform “Diagnostic Test Mode II” (Self-diagnostic results).
3. Start engine and let it idle for 2 second.
4. Perform “Diagnostic Test Mode II” (Self-diagnostic results).
SEF817Y
DTC P0650 MI
TD27Ti
EC-404
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