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LINE PRESSURE SOLENOID VALVE
AT-129
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Diagnostic ProcedureBCS0012N
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out the value of “LINE PRES DTY” while driving.
Check the value changes according to driving speed.
Without CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between TCM connector terminal and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
Item name ConditionDisplay value
(Approx.)
LINE PRES DTYSmall throttle opening (Low line pressure) ⇔
Large throttle opening (High line pressure)0% ⇔ 92%
SCIA3251E
ItemConnec-
torTerminal
(Wire color)ConditionJudge-
ment stan-
dard
(Approx.)
Line pres-
sure sole-
noid valveF104 1 - GroundWhen releasing acceler-
ator pedal after warming
up engine.1.5 - 3.0 V
When depressing accel-
erator pedal fully after
warming up engine.0V
Line pres-
sure sole-
noid valve
(with drop-
ping resis-
tor)F104 2 - GroundWhen releasing acceler-
ator pedal after warming
up engine.5 - 14 V
When depressing accel-
erator pedal fully after
warming up engine.0V
SCIA3267E

AT-130
LINE PRESSURE SOLENOID VALVE

2. CHECK DROPPING RESISTOR
1. Turn ignition switch OFF.
2. Disconnect dropping resistor harness connector in engine room.
3. Check resistance between terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. CHECK VALVE RESISTANCE
1. Turn ignition switch OFF.
2. Disconnect terminal cord assembly connector in engine room.
3. Check resistance between terminal cord assembly harness con-
nector terminal and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
Item Connector TerminalResistance
(Approx.)
Dropping resistor harness
connectorF39 1 - 2 12 Ω
SCIA4950E
Solenoid valve Connector Terminal Resistance (Approx.)
Line pressure solenoid
valveF43 4 - Ground 2.5 - 5.0 Ω
SCIA4951E

LINE PRESSURE SOLENOID VALVE
AT-131
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4. CHECK HARNESS BETWEEN TCM AND TERMINAL CORD ASSEMBLY HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect terminal cord assembly harness connector and TCM connector.
3. Check continuity between terminal cord assembly harness con-
nector terminal and TCM connector terminal.
4. Check continuity between terminal cord assembly harness con-
nector terminal and dropping resistor harness connector termi-
nal.
5. Check continuity between dropping resistor harness connector
terminal and TCM connector terminal.
6. If OK, check harness for short to ground and short to power.
7. If OK, check continuity between ground and transaxle assembly.
8. Reinstall any part removed.
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 DTC
Perform AT- 1 2 6 , "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 6.
6. CHECK TCM
1. Check TCM input/output signals. Refer to AT- 6 4 , "
TCM Terminals and Reference Value" .
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >>INSPECTION END
NG >> Repair or replace damaged parts.
Item Connector Terminal Continuity
TCM connector F104 1
Ye s
Terminal cord assembly
harness connectorF43 4
SCIA3272E
Item Connector Terminal Continuity
Dropping resistor harness
connectorF39 1
Ye s
Terminal cord assembly
harness connectorF43 4
SCIA3273E
Item Connector Terminal Continuity
TCM connector F104 2
Ye s
Dropping resistor harness
connectorF39 2
SCIA3274E

AT-132
LINE PRESSURE SOLENOID VALVE

Component InspectionBCS0012O
LINE PRESSURE SOLENOID VALVE
For removal, refer to AT- 2 2 5 , "Control Valve Assembly and Accumulators" .
Resistance
Check resistance between terminal and ground.
Operation
Check solenoid valve by listening for its operating sound while apply-
ing battery voltage to the terminal and ground.
DROPPING RESISTOR
Check resistance between terminals.
Solenoid valve Connector TerminalResistance
(Approx.)
Line pressure
solenoid valveF43 4 - Ground 2.5 - 5Ω
SCIA4951E
SCIA3275E
Item Connector TerminalResistance
(Approx.)
Dropping resistor harness
connectorF39 1 - 2 12 Ω
SCIA4950E

CAN COMMUNICATION LINE
AT-133
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CAN COMMUNICATION LINEPFP:31940
DescriptionBCS0012P
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent malfunction detection ability.
Many electronic control units are equipped onto a vehicle, and each control unit shares information and links
with other control units during operation (not independent). In CAN communication, control units are con-
nected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission
with less wiring. Each control unit transmits/receives data but selectively reads required data only.
On Board Diagnosis LogicBCS0012Q
Diagnostic trouble code “CAN COMM CIRCUIT” with CONSULT-II or 12th judgement flicker without CON-
SULT-II is detected when TCM cannot communicate to other control units.
Possible CauseBCS0012R
Harness or connector
(CAN communication line is open or shorted.)
DTC Confirmation ProcedureBCS0012S
CAUTION:
If performing this “DTC Confirmation Procedure” again, always turn ignition switch OFF and wait at
least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Wait at least 6 seconds or start engine and wait for at least 6
seconds.
4. If DTC is detected, go to AT- 1 3 5 , "
Diagnostic Procedure" .
WITHOUT CONSULT-II
1. Turn ignition switch ON.
2. Wait at least 6 seconds or start engine and wait at least 6 seconds.
3. Perform self-diagnosis. Refer to AT- 7 6 , "
Diagnostic Procedure Without CONSULT-II" .
4. If the check result is NG, go to AT- 1 3 5 , "
Diagnostic Procedure" .
BCIA0031E

CAN COMMUNICATION LINE
AT-135
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Data are reference value and are measured between each terminal and ground.
Diagnostic ProcedureBCS0012U
1. CHECK CAN COMMUNICATION CIRCUIT
With CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II.
Is any malfunction the
“CAN COMM CIRCUIT” indicated?
YES >> Print out CONSULT-II screen, go to LAN-49, "CAN Sys-
tem Specification Chart" .
NO >>INSPECTION END
Terminal Wire color Item ConditionJudgement standard
(Approx.)
5L CAN-H — —
6 P CAN-L — —
SCIA7135E

AT-136
A/T 1ST GEAR FUNCTION

A/T 1ST GEAR FUNCTIONPFP:31940
DescriptionBCS00131

This malfunction will not be detected while A/T CHECK indicator lamp is indicating another self-diagnosis
malfunction.

This malfunction is detected when the A/T does not shift into first gear position as instructed by TCM. This
is not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as
control valve sticking, improper solenoid valve operation, etc.
On Board Diagnosis LogicBCS00132

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM
as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more
than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when either shift solenoid valve A is stuck open or shift solenoid valve B is
stuck open.

Gear positions supposed by TCM are as follows.
In case of gear position with no malfunctions: 1 , 2, 3 and 4 positions
In case of gear position with shift solenoid valve A stuck open: 2* , 2, 3 and 3 positions
In case of gear position with shift solenoid valve B stuck open: 4* , 3, 3 and 4 positions to each gear posi-
tion above
*: “A/T 1ST GR FNCTN” is detected.

Diagnostic trouble code “A/T 1ST GR FNCTN” with CONSULT-II is detected when A/T cannot be shifted
to the 1st gear position even if electrical circuit is good.
Possible CauseBCS00133

Shift solenoid valve A

Shift solenoid valve B

Each clutch

Hydraulic control circuit
Gear position 1 2 3 4
Shift solenoid valve A ON (Closed) OFF (Open) OFF (Open) ON (Closed)
Shift solenoid valve B ON (Closed) ON (Closed) OFF (Open) OFF (Open)

A/T 1ST GEAR FUNCTION
AT-137
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DTC Confirmation ProcedureBCS00134
CAUTION:

Always drive vehicle at a safe speed.

If performing this “DTC Confirmation Procedure” again, always turn ignition switch OFF and wait
at least 10 seconds before continuing.
TESTING CONDITION:
Always drive vehicle on a level road to improve the accuracy of test.
After the repair, perform the following procedure to confirm that the malfunction is eliminated.
WITH CONSULT-II
1. Start engine and select “DATA MONITOR” mode for “A/T” with
CONSULT-II.
2. Make sure that output voltage of A/T fluid temperature sensor is
within the range below.
FLUID TEMP SE: 0.4 - 1.5 V
If out of range, drive vehicle to decrease the voltage (warm up
the fluid) or stop engine to increase the voltage (cool down the
fluid).
3. Select “1ST GR FNCTN P0731” of “DTC WORK SUPPORT”
mode for “A/T” with CONSULT-II and touch “START”.
4. Accelerate vehicle to 20 to 25 km/h (12 to 16 MPH) under the following condition and release accelerator
pedal completely.
THROTTLE POSI: Less than 1.0/8 (at all times during step 4)
SLCT LVR POSI: “D” position
–Make sure that “GEAR” shows “2” after releasing pedal.
5. Depress accelerator pedal to WOT (more than 7.0/8 of “THROTTLE POSI”) quickly from a speed of 20 to
25 km/h (12 to 16 MPH) until “TESTING” changes to “STOP VEHICLE” or “COMPLETED”. (It will take
approximately 3 seconds.)
If the check result NG appears on CONSULT-II screen, go to AT- 1 3 8 , "
Diagnostic Procedure" .
If “STOP VEHICLE” appears on CONSULT-II screen, go to the following step.
–Make sure that “GEAR” shows “1” when depressing accelerator pedal to WOT.
–If “TESTING” does not appear on CONSULT-II for a long time, select “SELF-DIAG RESULTS” for
“A/T”. In case a 1st trip DTC other than “A/T 1ST GR FNCTN” is shown, refer to applicable “TROU-
BLE DIAGNOSIS FOR DTC”.
6. Stop vehicle.
7. Follow the instruction displayed. (Check for normal shifting referring to the table below.)
8. Make sure that “OK” is displayed. (If “NG” is displayed, refer to AT- 1 3 8 , "
Diagnostic Procedure" .)
Refer to AT- 5 4 , "
Vehicle Speed Which Gear Shifting Occurs" .
BCIA0031E
Vehicle condition Gear on actual transmission shift pattern when screen is changed to 1 → 2 → 3 → 4
No malfunction exists. 1 → 2 → 3 → 4
Malfunction for “A/T 1ST GR
FNCTN ” exists.2 → 2 → 3 → 3
4 → 3 → 3 → 4

AT-138
A/T 1ST GEAR FUNCTION

Diagnostic ProcedureBCS00135
1. CHECK VALVE RESISTANCE
1. Remove control valve assembly. Refer to AT- 2 2 5 , "
Control Valve Assembly and Accumulators" .
–Shift solenoid valve A
–Shift solenoid valve B
2. Check resistance between terminal cord assembly harness con-
nector terminal and ground. Refer to AT- 9 1 , "
Wiring Diagram —
AT — SSV/A" and AT- 9 6 , "Wiring Diagram — AT — SSV/B" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace damaged parts.
2. CHECK VALVE OPERATION
1. Remove control valve assembly. Refer to AT- 2 2 5 , "
Control Valve Assembly and Accumulators" .
–Shift solenoid valve A
–Shift solenoid valve B
2. Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminals and ground. Refer to
AT- 9 1 , "
Wiring Diagram — AT — SSV/A" and AT- 9 6 , "Wiring
Diagram — AT — SSV/B" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace shift solenoid valve assembly.
Solenoid valve Connector Terminal Resistance (Approx.)
Shift solenoid valve A
F432 - Ground 20 - 30Ω
Shift solenoid valve B 1 - Ground 5 - 20Ω
SCIA3594E
SCIA3595E

A/T 1ST GEAR FUNCTION
AT-139
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3. CHECK CONTROL VALVE
1. Disassemble control valve assembly. Refer to AT- 2 8 0 , "
Control Valve Assembly" .
2. Check to ensure that:
–Valve, sleeve and plug slide along valve bore under their own weight.
–Valve, sleeve and plug are free from burrs, dents and scratches.
–Control valve springs are free from damage, deformation and fatigue.
–Hydraulic line is free from obstacles.
OK or NG
OK >> GO TO 4.
NG >> Repair control valve assembly.
4. CHECK DTC
Perform AT- 1 3 7 , "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> Check control valve again. Repair or replace control valve assembly.