2003 NISSAN ALMERA N16 Engine control circuit

TROUBLE DIAGNOSES FOR SYMPTOMS
AT-237
[EURO-OBD]
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20. Vehicle Does Not Decelerate By Engine BrakeECS007QL
SYMPTOM:
Vehicle does not decelerate by engine brake when shifting from 2
2 (12 ) to 11 .
1.CHECK SYMPTOM
Is 6. Vehicle Does Not Creep Backward In “R” Position OK?
Ye s o r N o
Yes >> Go to AT-233, "15. Engine Speed Does Not Return To Idle (Light Braking D4→ D3 )" .
No >> Go to AT- 2 1 6 , "
6. Vehicle Does Not Creep Backward In “R” Position" .
21. TCM Self-diagnosis Does Not Activate (PNP & Overdrive Control Switches,
and Throttle Position Sensor Circuit Checks)
ECS007QM
SYMPTOM:
O/D OFF indicator lamp does not come on in TCM self-diagnostic procedure even if the lamp circuit is
good.
DESCRIPTION
●PNP switch
The PNP switch assembly includes a transmission position switch. The transmission position switch
detects the selector lever position and sends a signal to the TCM.
●Overdrive control switch
SCIA0752E
SCIA0776E
MCIB9006E

AT-238
[EURO-OBD]
TROUBLE DIAGNOSES FOR SYMPTOMS
Detects the overdrive control switch position (ON or OFF) and sends a signal to the TCM.
●Throttle position sensor*
*: This sensor means accelerator pedal position (APP) sensor.
Electric throttle control actuator consists of throttle control motor, acceleration pedal position sensor, throt-
tle position sensor, etc. The actuator sends a signal to the TCM.
DIAGNOSTIC PROCEDURE
1. CHECK PNP SWITCH CIRCUIT (WITH CONSULT-II)
With CONSULT-II
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out “P/N”, “R”, “D”, “2” and “1” position switches moving selector lever to each position.
Check that the signal of the selector lever position is indicated
properly.
OK or NG
OK >> GO TO 3
NG >> Check the following items:
●PNP switch (Refer to AT- 2 4 2 , "COMPONENT
INSPECTION" .)
●Harness for short or open between ignition switch and
PNP switch
●Harness for short or open between PNP switch and
TCM
●Diode (P, N positions)
SAT701J

TROUBLE DIAGNOSES FOR SYMPTOMS
AT-239
[EURO-OBD]
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2.CHECK PNP SWITCH CIRCUIT (WITHOUT CONSULT-II)
Without CONSULT-II
1. Turn ignition switch to “ON” position. (Do not start engine.)
2. Check voltage between TCM terminals 26, 27, 34, 35, 36 and
ground while moving selector lever through each position.
OK or NG
OK >> GO TO 4
NG >> Check the following items:
●PNP switch (Refer to AT- 2 4 2 , "COMPONENT
INSPECTION" .)
●Harness for short or open between ignition switch and
PNP switch
●Harness for short or open between PNP switch and TCM
●Diode (P, N positions)
3.CHECK OVERDRIVE CONTROL SWITCH CIRCUIT (WITH CONSULT-II)
With CONSULT-II
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out “OVERDRIVE SWITCH”.
Check the signal of the overdrive control switch is indicated properly.
(Overdrive control switch “ON” displayed on CONSULT-II means
overdrive “OFF”.)
OK or NG
OK >> GO TO 5
NG >> Check the following items:
●Overdrive control switch (Refer to AT- 2 4 2 , "COMPO-
NENT INSPECTION" .)
●Harness for short or open between TCM and over-
drive control switch
●Harness of ground circuit for overdrive control switch
for short or open Vo l t a g e :
B: Battery voltage
0: 0V
Lever posi-
tionTerminal No.
36 35 34 27 26
P, N B 0 0 0 0
R0B000
D0 0B00
2000B0
10000B
SCIA0777E
SAT645J

AT-240
[EURO-OBD]
TROUBLE DIAGNOSES FOR SYMPTOMS
4. CHECK OVERDRIVE CONTROL SWITCH CIRCUIT (WITHOUT CONSULT-II)
Without CONSULT-II
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Check voltage between A/T device connector terminal 2 and ground when overdrive control switch is “ON”
and “OFF”.
OK or NG
OK >> GO TO 6
NG >> Check the following items:
●Overdrive control switch (Refer to AT-242, "COMPONENT INSPECTION" .)
●Harness for short or open between TCM and overdrive control switch
●Harness of ground circuit for overdrive control switch for short or open
Voltage:
Switch position “ON”:
Battery voltage
Switch position “OFF”:
1V or less

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
AT-247
[EXC.F/EURO-OBD]
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Overdrive control
switchOVERDRIVE
SW
[ON/OFF]X——●ON/OFF state com-
puted from signal of
overdrive control SW is
displayed.
PN position (PNP)
switchPN POSI SW
[ON/OFF]
X——
●ON/OFF state com-
puted from signal of PN
position SW is dis-
played.
R position switch R POSITION SW
[ON/OFF]
X——
●ON/OFF state com-
puted from signal of R
position SW is dis-
played.
D position switch D POSITION SW
[ON/OFF]
X——
●ON/OFF state com-
puted from signal of D
position SW is dis-
played.
2 position switch 2 POSITION SW
[ON/OFF]
X——
●ON/OFF status, com-
puted from signal of 2
position SW, is dis-
played.
1 position switch 1 POSITION SW
[ON/OFF]
X——
●ON/OFF status, com-
puted from signal of 1
position SW, is dis-
played.
Kickdown switch KICKDOWN SW
[ON/OFF]
X——
●ON/OFF status, com-
puted from signal of
kick down SW, is dis-
played.●This is displayed even
when no kick down
switch is equipped.
Gear position GEAR
—— X
●Gear position data
used for computation
by TCM, is displayed.
Selector lever
positionSLCT LVR POSI
—— X
●Selector lever position
data, used for compu-
tation by TCM, is dis-
played.●A specific value used
for control is displayed
if fail-safe is activated
due to error.
Vehicle speed VEHICLE
SPEED
[km/h] or [mph]—— X
●Vehicle speed data,
used for computation
by TCM, is displayed.
Torque converter
slip ratioTC SLIP
RATIO
[0.000]———
●Ratio of engine revolu-
tion to input shaft revo-
lution of torque
converter
Torque converter
slip speedTC SLIP
SPEED
[rpm]———Difference in revolution
between input shaft revo-
lution and input shaft rev-
olution of torque
converterDisplay doesn't indicate
o rpm even if engine is
stopped.
But this isn't malfunc-
tion.
can communica-
tionCAN COMM
[OK/UNKWN]—X—
can circuit 1CAN CIRC 1
[OK/UNKWN]—X— Item Displaymove to center Monitor items
Description Remarks
TCM
Input
signalsCAN
comm
sig-
nalsMain
signalsSelection
from
menu

TROUBLE DIAGNOSIS — INTRODUCTION
AT-255
[EXC.F/EURO-OBD]
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TROUBLE DIAGNOSIS — INTRODUCTIONPFP:00000
IntroductionECS007QP
The TCM receives a signal from the vehicle speed sensor, throttle
position sensor or PNP switch and provides shift control or lock-up
control via A/T solenoid valves.
Input and output signals must always be correct and stable in the
operation of the A/T system. The A/T system must be in good oper-
ating condition and be free of valve seizure, solenoid valve malfunc-
tion, etc.
It is much more difficult to diagnose a problem that occurs intermit-
tently rather than continuously. Most intermittent problems are
caused by poor electric connections or improper wiring. In this case,
careful checking of suspected circuits may help prevent the replace-
ment of good parts.
A visual check only, may not find the cause of the problems. A road
test with CONSULT-II or a circuit tester connected should be per-
formed. Follow the “Work Flow”. Refer to AT- 2 5 9 , "
Work Flow" .
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a drive ability complaint. The cus-
tomer can supply good information about such problems, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “Diagnostic Worksheet” like the exam-
ple (AT-256, "
DIAGNOSTIC WORKSHEET" ) should be used.
Start your diagnosis by looking for “conventional” problems first. This
will help troubleshoot drive ability problems on an electronically con-
trolled engine vehicle.
Also check related Service bulletins for information.
SAT631IA
SAT632I
SEF234G

AT-258
[EXC.F/EURO-OBD]
TROUBLE DIAGNOSIS — INTRODUCTION
4. 4-
3.Cruise testAT-271, "3.
CRUISE
TEST",
AT-275,
"Cruise Test
— Part 1"
Part-1
❏ 8. Vehicle Cannot Be Started From D
1 , AT- 3 1 7 .
❏ 9. A/T Does Not Shift: D
1→ D2 Or Does Not Kickdown: D4→ D2 , AT- 3 2 0 .
❏ 10. A/T Does Not Shift: D
2→ D3 , AT-322 .
❏ 11. A/T Does Not Shift: D
3→ D4 , AT-324 .
❏ 12. A/T Does Not Perform Lock-up,AT-326
.
❏ 13. A/T Does Not Hold Lock-up Condition, AT-326
.
❏ 14. Lock-up Is Not Released, AT-328
.
❏ 15. Engine Speed Does Not Return To Idle (Light Braking D
4→ D3 ), AT- 3 2 8 .
Part-2AT-278,
"Cruise Test
— Part 2"❏ 16. Vehicle Does Not Start From D1 , AT-330 .
❏ 9. A/T Does Not Shift: D
1→ D2 Or Does Not Kickdown: D4→ D2 , AT- 3 2 0 .
❏ 10. A/T Does Not Shift: D
2→ D3 , AT-322 .
❏ 11. A/T Does Not Shift: D
3→ D4 , AT-324 .
Part-3AT-280,
"Cruise Test
— Part 3"❏ 17. A/T Does Not Shift: D4→ D3 When Overdrive Control Switch “ON” → “OFF”, AT- 3 3 0 .
❏ 15. Engine Speed Does Not Return To Idle (Engine Brake In D
3 ), AT-328 .
❏ 18. A/T Does Not Shift: D
3→ 22 , When Selector Lever “D” → “2” Position, AT- 3 3 1 .
❏ 15. Engine Speed Does Not Return To Idle (Light Braking D
4→D3 ),AT- 3 2 8 .
❏ 19. A/T Does Not Shift: 2
2→ 11 , When Selector Lever “2” → “1” Position, AT- 3 3 2 .
❏ 20. Vehicle Does Not Decelerate By Engine Brake, AT- 3 3 3
.
❏ 21. TCM Self-diagnosis Does Not Activate (PNP & Overdrive Control Switches, and throttle position sen-
sor Circuit Checks), AT- 3 3 3
.
❏ SELF-DIAGNOSTIC PROCEDURE — Mark detected items.
❏ Vehicle speed sensor·A/T (Revolution sensor), AT-343
.
❏ Vehicle speed sensor·MTR, AT- 3 4 8
.
❏ Accelerator pedal position (APP) sensor, AT-352
.
❏ Shift solenoid valve A, AT-357
.
❏ Shift solenoid valve B, AT-362
.
❏ Overrun clutch solenoid valve, AT-367
.
❏ Torque converter clutch solenoid valve, AT- 3 7 2
.
❏ Batt/fluid temp sen (A/T fluid temperature sensor and TCM power source), AT-377
.
❏ Engine speed signal, AT-383
.
❏ Line pressure solenoid valve, AT-388
.
❏ CAN communication line, AT-395
.
❏ Control unit (RAM), control unit (ROM), AT- 2 0 5
.
❏ Control unit (EEP ROM), AT- 2 0 7
.
❏ PNP & overdrive control switches, and throttle position sensor, AT- 3 3 8
.
❏ Battery
❏ Others
5.❏ For self-diagnosis NG items, inspect each component. Repair or replace the damaged parts.AT- 2 5 0 ,
"SELF-DIAG-
NOSTIC
PROCE-
DURE
(WITHOUT
CONSULT-
II)"
6.❏ Perform all ROAD TEST and re-mark required procedures.AT-266,
"Road Test"

AT-266
[EXC.F/EURO-OBD]
TROUBLE DIAGNOSIS — BASIC INSPECTION
JUDGEMENT OF LINE PRESSURE TEST
Road TestECS007QU
DESCRIPTION
●The purpose of the test is to determine overall performance of A/
T and analyze causes of problems.
●The road test consists of the following three parts:
1. Check before engine is started
2. Check at idle
3. Cruise test
●Before road test, familiarize yourself with all test procedures and
items to check.
●Conduct tests on all items until specified symptom is found.
Troubleshoot items which check out No Good after road test.
Refer to the following items.
Judgement Suspected parts
At idleLine pressure is low in all positions.
●Oil pump wear
●Control piston damage
●Pressure regulator valve or plug sticking
●Spring for pressure regulator valve damaged
●Fluid pressure leakage between oil strainer and pressure regulator valve
●Clogged strainer
Line pressure is low in particular posi-
tion.
●Fluid pressure leakage between manual valve and particular clutch
●For example, line pressure is:
− Low in “R” and “1” positions, but
− Normal in “D” and “2” positions.
Therefore, fluid leakage exists at or around low and reverse brake circuit.
Refer to AT- 1 8 , "
CLUTCH AND BAND CHART" .
Line pressure is high.
●Maladjustment of throttle position sensor
●A/T fluid temperature sensor damaged
●Line pressure solenoid valve sticking
●Short circuit of line pressure solenoid valve circuit
●Pressure modifier valve sticking
●Pressure regulator valve or plug sticking
●Open in dropping resistor circuit
At stall
speedLine pressure is low.
●Maladjustment of throttle position sensor
●Line pressure solenoid valve sticking
●Short circuit of line pressure solenoid valve circuit
●Pressure regulator valve or plug sticking
●Pressure modifier valve sticking
●Pilot valve sticking
SAT786A
SAT496G