turn signal INFINITI QX56 2004 Factory Service Manual

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ACS-27
[ICC]
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Revision: August 20072004 QX56
CONSULT-II Function (ICC)EKS007PH
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II OPERATION
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data
link connector.
3. Turn ignition switch ON.
4. Touch “START (NISSAN BASED VHCL)”.
5. Touch “ICC” on the "SELECT SYSTEM" screen.
If “ICC” is not indicated, go to GI-39, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
ICC diagnostic mode Description
WORK SUPPORTSupports inspections and adjustments. Commands are transmitted to the ICC unit for setting the sta-
tus suitable for required operation, input/output signals are received from the ICC unit and received
data is displayed.
SELF-DIAG RESULTS Displays ICC unit self-diagnosis results.
DATA MONITOR Displays ICC unit input/output data in real-time.
CAN DIAG SUPPORT MNTR The results of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST Operation of electrical loads can be checked by sending driving signal to them.
ECU PART NUMBER ICC unit part number can be read.
BBIA0369E
BCIA0029E
WKIA1750E

ACS-42
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: August 20072004 QX56
3. CHECK ICC STEERING SWITCH SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect connectors of ECM and spiral cable.
3. Check continuity between ECM harness connectors E16 and
F54 terminals 67 (B), 99 (G/Y) and spiral cable M30 terminal 33
(B), 34 (G/Y).
OK or NG
OK >> GO TO 4.
NG >>

Repair harness between ECM and spiral cable.

Erase DTC and perform ICC system running test. Then, perform self-diagnosis of ICC system
again.
4. CHECK ICC STEERING SWITCH SIGNAL CIRCUIT
1. Disconnect remaining spiral cable connector.
2. Check continuity between spiral cable (to vehicle) harness con-
nector M30 terminal 33, 34 and spiral cable (to switch) harness
connector M102 terminal 14,15.
OK or NG
OK >> Replace ECM. Erase DTC and perform ICC system run-
ning test. Then perform self-diagnosis of ICC system
again.
NG >>

Replace spiral cable. Refer to SRS-47, "Removal
and Installation" .

Erase DTC and perform ICC system running test.
Then, perform self-diagnosis of ICC system again.
DTC 74 LASER BEAM OFF CENTEREKS007XE
1. DIAGNOSTIC CHECK
1. Adjust laser beam aiming. Then erase DTC, and perform ICC system running test. Refer to ACS-12,
"LASER BEAM AIMING ADJUSTMENT" .
2. After that, perform self-diagnosis of ICC system. Is DTC 74 LASER BEAM OFF CNTR indicated?
YES or NO
YES >>
Replace ICC sensor and adjust laser beam aiming. Refer to ACS-59, "ICC Sensor" .

After that, erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC
system again.
NO >> Inspection end.67 - 33, 99 - 34 Continuity should exist.
WKIA1928E
34 - 14, 33 - 15 Continuity should exist.
SKIA5979E

ACS-48
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: August 20072004 QX56
DTC 96 NP RANGEEKS007XH
1. CHECK ICC UNIT CONNECTORS
1. Turn ignition switch OFF.
2. Disconnect ICC unit harness connectors and connect them securely again. Then erase DTC. Then, per-
form self-diagnosis of ICC system again.
OK or NG
OK >> GO TO 2.
NG >>

Poor connector connection.

Check connector. (Check connector housing for disconnected, loose, bent, and collapsed ter-
minals. If any malfunction is detected, repair applicable part.) After repair, erase DTC, and per-
form ICC system running test. Then perform self-diagnosis of ICC system again.
2. CHECK NP RANGE SWITCH SIGNAL
With CONSULT-II

With data monitor, check that “NP RANGE SW” operates normally.
OK or NG
OK >> Perform TCM diagnosis. Refer to AT-93, "SELF-DIAGNOSTIC RESULT MODE" .
NG >> GO TO 3.
3. CHECK HARNESS BETWEEN ICC UNIT AND TCM
1. Turn ignition switch OFF.
2. Disconnect ICC unit harness connectors and A/T assembly har-
ness connector.
3. Check continuity between ICC unit harness connector B13 ter-
minal 7 (B/R) and A/T assembly harness connector F9 terminal
9 (B/R).
OK or NG
OK >> Replace ICC unit. Refer to ACS-59, "ICC Unit" . Erase
DTC and perform ICC system running test. Then per-
form self-diagnosis of ICC system again.
NG >>

Repair harness between ICC unit and TCM.

After repair, erase DTC and perform ICC system running test. Then, perform self-diagnosis of
ICC system again.
DTC 97 AT CIRCUITEKS007XI
1. CHECK AT CIRCUIT
With CONSULT-II

With TCM diagnosis, check that shift operates normally. Refer to AT-109, "DTC P0705 PARK/NEUTRAL
POSITION SWITCH" .
OK or NG
OK >> Replace ICC unit. Refer to ACS-59, "ICC Unit" . Erase DTC and perform self-diagnosis of ICC
system again.
NG >>

Perform TCM diagnosis.

After repair, erase DTC and perform self-diagnosis of ICC system again.
7 - 9 Continuity should exist.
SKIA5982E

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Revision: August 20072004 QX56 On Board Diagnosis Logic ................................... 151
Possible Cause .................................................... 151
DTC Confirmation Procedure ............................... 151
Diagnostic Procedure ........................................... 152
DTC P1759 FRONT BRAKE SOLENOID VALVE
FUNCTION .............................................................. 154
Description ........................................................... 154
CONSULT-II Reference Value .............................. 154
On Board Diagnosis Logic ................................... 154
Possible Cause .................................................... 154
DTC Confirmation Procedure ............................... 154
Diagnostic Procedure ........................................... 155
DTC P1762 DIRECT CLUTCH SOLENOID VALVE . 157
Description ........................................................... 157
CONSULT-II Reference Value .............................. 157
On Board Diagnosis Logic ................................... 157
Possible Cause .................................................... 157
DTC Confirmation Procedure ............................... 157
Diagnostic Procedure ........................................... 158
DTC P1764 DIRECT CLUTCH SOLENOID VALVE
FUNCTION .............................................................. 160
Description ........................................................... 160
CONSULT-II Reference Value .............................. 160
On Board Diagnosis Logic ................................... 160
Possible Cause .................................................... 160
DTC Confirmation Procedure ............................... 160
Diagnostic Procedure ........................................... 161
DTC P1767 HIGH AND LOW REVERSE CLUTCH
SOLENOID VALVE ................................................. 163
Description ........................................................... 163
CONSULT-II Reference Value .............................. 163
On Board Diagnosis Logic ................................... 163
Possible Cause .................................................... 163
DTC Confirmation Procedure ............................... 163
Diagnostic Procedure ........................................... 164
DTC P1769 HIGH AND LOW REVERSE CLUTCH
SOLENOID VALVE FUNCTION ............................. 166
Description ........................................................... 166
CONSULT-II Reference Value .............................. 166
On Board Diagnosis Logic ................................... 166
Possible Cause .................................................... 166
DTC Confirmation Procedure ............................... 166
Diagnostic Procedure ........................................... 167
DTC P1772 LOW COAST BRAKE SOLENOID
VALVE ..................................................................... 169
Description ........................................................... 169
CONSULT-II Reference Value .............................. 169
On Board Diagnosis Logic ................................... 169
Possible Cause .................................................... 169
DTC Confirmation Procedure ............................... 169
Diagnostic Procedure ........................................... 170
DTC P1774 LOW COAST BRAKE SOLENOID
VALVE FUNCTION ................................................. 172
Description ........................................................... 172
CONSULT-II Reference Value .............................. 172
On Board Diagnosis Logic ................................... 172
Possible Cause .................................................... 172
DTC Confirmation Procedure ............................... 172
Diagnostic Procedure ........................................... 173DTC P1841 ATF PRESSURE SWITCH 1 ...............175
Description ............................................................175
CONSULT-II Reference Value ..............................175
On Board Diagnosis Logic ....................................175
Possible Cause .....................................................175
DTC Confirmation Procedure ...............................175
Diagnostic Procedure ...........................................176
DTC P1843 ATF PRESSURE SWITCH 3 ...............178
Description ............................................................178
CONSULT-II Reference Value ..............................178
On Board Diagnosis Logic ....................................178
Possible Cause .....................................................178
DTC Confirmation Procedure ...............................178
Diagnostic Procedure ...........................................179
DTC P1845 ATF PRESSURE SWITCH 5 ...............181
Description ............................................................181
CONSULT-II Reference Value ..............................181
On Board Diagnosis Logic ....................................181
Possible Cause .....................................................181
DTC Confirmation Procedure ...............................181
Diagnostic Procedure ...........................................182
DTC P1846 ATF PRESSURE SWITCH 6 ...............184
Description ............................................................184
CONSULT-II Reference Value ..............................184
On Board Diagnosis Logic ....................................184
Possible Cause .....................................................184
DTC Confirmation Procedure ...............................184
Diagnostic Procedure ...........................................185
CLOSED THROTTLE POSITION AND WIDE OPEN
THROTTLE POSITION CIRCUIT ............................187
CONSULT-II Reference Value ..............................187
Diagnostic Procedure ...........................................187
BRAKE SIGNAL CIRCUIT ......................................188
CONSULT-II Reference Value ..............................188
Diagnostic Procedure ...........................................188
TOW MODE SWITCH .............................................189
Description ............................................................189
Diagnostic Procedure ...........................................189
TROUBLE DIAGNOSIS FOR SYMPTOMS ............191
AT CHECK Indicator Lamp Does Not Come On ..191
Engine Cannot Be Started In “P” or “N” Position ..192
In “P” Position, Vehicle Moves When Pushed ......193
In “N” Position, Vehicle Moves ..............................194
Large Shock (“N” to “D” Position) .........................195
Vehicle Does Not Creep Backward In “R” Position .198
Vehicle Does Not Creep Forward In “D” Position . 201
Vehicle Cannot Be Started From D
1 .....................203
A/T Does Not Shift: D
1 → D2 ................................206
A/T Does Not Shift: D
2 → D3 ................................208
A/T Does Not Shift: D
3 → D4 ................................210
A/T Does Not Shift: D
4 → D5 ................................213
A/T Does Not Perform Lock-up ............................215
A/T Does Not Hold Lock-up Condition ..................217
Lock-up Is Not Released ......................................219
Engine Speed Does Not Return to Idle ................220
A/T Does Not Shift: 5th gear → 4th gear ..............221
A/T Does Not Shift: 4th gear → 3rd gear ..............224
A/T Does Not Shift: 3rd gear → 2nd gear .............225

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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ON BOARD DIAGNOSTIC (OBD) SYSTEMPFP:00028
IntroductionUCS002CM
The A/T system has two self-diagnostic systems.
The first is the emission-related on board diagnostic system (OBD-II) performed by the TCM in combination
with the ECM. The malfunction is indicated by the MIL (malfunction indicator lamp) and is stored as a DTC in
the ECM memory but not the TCM memory.
The second is the TCM original self-diagnosis indicated by the A/T CHECK indicator lamp. The malfunction is
stored in the TCM memory. The detected items are overlapped with OBD-II self-diagnostic items. For detail,
refer to AT- 9 3 , "
SELF-DIAGNOSTIC RESULT MODE" .
OBD-II Function for A/T SystemUCS002C N
The ECM provides emission-related on board diagnostic (OBD-II) functions for the A/T system. One function
is to receive a signal from the TCM used with OBD-related parts of the A/T system. The signal is sent to the
ECM when a malfunction occurs in the corresponding OBD-related part. The other function is to indicate a
diagnostic result by means of the MIL (malfunction indicator lamp) on the instrument panel. Sensors, switches
and solenoid valves are used as sensing elements.
The MIL automatically illuminates in One or Two Trip Detection Logic when a malfunction is sensed in relation
to A/T system parts.
One or Two Trip Detection Logic of OBD-IIUCS002CO
ONE TRIP DETECTION LOGIC
If a malfunction is sensed during the first test drive, the MIL will illuminate and the malfunction will be stored in
the ECM memory as a DTC. The TCM is not provided with such a memory function.
TWO TRIP DETECTION LOGIC
When a malfunction is sensed during the first test drive, it is stored in the ECM memory as a 1st trip DTC
(diagnostic trouble code) or 1st trip freeze frame data. At this point, the MIL will not illuminate. — First Trip
If the same malfunction as that experienced during the first test drive is sensed during the second test drive,
the MIL will illuminate. — Second Trip
The “trip” in the “One or Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation.
OBD-II Diagnostic Trouble Code (DTC)UCS002CP
HOW TO READ DTC AND 1ST TRIP DTC
DTC and 1st trip DTC can be read by the following methods.
( with CONSULT-II or GST) CONSULT-II or GST (Generic Scan Tool) Examples: P0705, P0720 etc.
These DTC are prescribed by SAE J2012.
(CONSULT-II also displays the malfunctioning component or system.)

1st trip DTC No. is the same as DTC No.

Output of the diagnostic trouble code indicates that the indicated circuit has a malfunction. How-
ever, in case of the Mode II and GST, they do not indicate whether the malfunction is still occurring
or occurred in the past and returned to normal.
CONSULT-II can identify them as shown below, therefore, CONSULT-II (if available) is recom-
mended.
A sample of CONSULT-II display for DTC and 1st trip DTC is shown
on the next page. DTC or 1st trip DTC of a malfunction is displayed
in SELF-DIAGNOSTIC RESULTS mode for “ENGINE” with CON-
SULT-II. Time data indicates how many times the vehicle was driven
after the last detection of a DTC.
BCIA0030E

TROUBLE DIAGNOSIS
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TROUBLE DIAGNOSISPFP:00004
DTC Inspection Priority ChartUCS002C R
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 is displayed with other DTCs, first perform the trouble diagnosis for DTC U1000. Refer to
AT-1 03
.
Fail-SafeUCS002CS
The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is a an error in
a main electronic control input/output signal circuit. In fail-safe mode the transmission is fixed in 2nd or 4th
(depending on the breakdown position), so the customer should feel “slipping” or “poor acceleration”. When
fail-safe mode is triggered, when the ignition switch is switched “ON”, the AT CHECK indicator lamp flashes for
about 8 seconds.
Even when the electronic circuits are normal, under special conditions (for example, when slamming on the
brake with the wheels spinning drastically and stopping the tire rotation), the transmission can go into fail-safe
mode. If this happens, switch “OFF” the ignition switch for 10 seconds, then switch it “ON” again to return to
the normal shift pattern. Also, the AT CHECK indicator lamp flashes for about 8 seconds once, then is cleared.
Therefore, the customer's vehicle has returned to normal, so handle according to the “diagnostics flow” (Refer
to AT-46, "
WORK FLOW" ).
FAI L-S AFE FUN CT ION
If any malfunction occurs in a sensor or solenoid, this function controls the A/T to mark driving possible.
Vehicle Speed Sensor

Signals are input from two systems - from vehicle speed sensor A/T (revolution sensor) installed on the
transmission and from combination meter so normal driving is possible even if there is a malfunction in
one of the systems. And if vehicle speed sensor A/T (revolution sensor) has unusual cases, 5th gear is
prohibited.
Accelerator Pedal Position Sensor

If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM accord-
ing to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow
systems, the engine speed is fixed by ECM to a pre-determined engine speed to make driving possible.
Throttle Position Sensor

If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM accord-
ing to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow
systems, the accelerator opening angle is controlled by the idle signal sent from the ECM which is based
on input indicating either idle condition or off-idle condition (pre-determined accelerator opening) in order
to make driving possible.
PNP Switch

In the unlikely event that a malfunction signal enters the TCM, the position indicator is switched “OFF”, the
starter relay is switched “OFF” (starter starting is disabled), the back-up lamp relay switched “OFF” (back-
up lamp is OFF) and the position is fixed to the “D” range to make driving possible.
Starter Relay

The starter relay is switched “OFF”. (Starter starting is disabled.)
Priority Detected items (DTC)
1 U1000 CAN communication line
2 Except above

AT-48
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
4❏ Perform all road tests and enter checks in required inspection items.AT-6 1
4-1.Check before engine is started
AT-6 2
❏ AT-191, "AT CHECK Indicator Lamp Does Not Come On" .
❏ Perform self-diagnostics Enter checks for detected items. AT- 9 3
❏ AT- 1 0 3 , "DTC U1000 CAN COMMUNICATION LINE"
❏ AT- 1 0 5 , "DTC P0615 START SIGNAL CIRCUIT"
❏ AT- 1 0 8 , "DTC P0700 TCM"
❏ AT- 1 0 9 , "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏ AT- 11 2 , "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)"
❏ AT- 11 5 , "DTC P0725 ENGINE SPEED SIGNAL"
❏ AT- 11 8 , "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
❏ AT- 1 2 1 , "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
❏ AT- 1 2 4 , "DTC P0745 LINE PRESSURE SOLENOID VALVE"
❏ AT- 1 2 7 , "DTC P1702 TRANSMISSION CONTROL MODULE (RAM)"
❏ AT- 1 2 8 , "DTC P1703 TRANSMISSION CONTROL MODULE (ROM)"
❏ AT- 1 2 9 , "DTC P1705 THROTTLE POSITION SENSOR"
❏ AT- 1 3 1 , "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
❏ AT- 1 3 4 , "DTC P1716 TURBINE REVOLUTION SENSOR"
❏ AT- 1 3 6 , "DTC P1721 VEHICLE SPEED SENSOR MTR"
❏ AT- 1 3 9 , "DTC P1730 A/T INTERLOCK"
❏ AT- 1 4 2 , "DTC P1731 A/T 1ST ENGINE BRAKING"
❏ AT- 1 4 5 , "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
❏ AT- 1 4 8 , "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
❏ AT- 1 5 1 , "DTC P1757 FRONT BRAKE SOLENOID VALVE"
❏ AT- 1 5 4 , "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
❏ AT- 1 5 7 , "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
❏ AT- 1 6 0 , "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
❏ AT- 1 6 3 , "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
❏ AT- 1 6 6 , "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
FUNCTION"
❏ AT- 1 6 9 , "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
❏ AT- 1 7 2 , "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
❏ AT- 1 7 5 , "DTC P1841 ATF PRESSURE SWITCH 1"
❏ AT- 1 7 8 , "DTC P1843 ATF PRESSURE SWITCH 3"
❏ AT- 1 8 1 , "DTC P1845 ATF PRESSURE SWITCH 5"
❏ AT- 1 8 4 , "DTC P1846 ATF PRESSURE SWITCH 6"
4-2.Idle inspection
AT-6 2
❏ AT-192, "Engine Cannot Be Started In “P” or “N” Position"
❏ AT-193, "In “P” Position, Vehicle Moves When Pushed"
❏ AT-194, "In “N” Position, Vehicle Moves"
❏ AT-195, "Large Shock (“N” to “D” Position)"
❏ AT-198, "Vehicle Does Not Creep Backward In “R” Position"
❏ AT-201, "Vehicle Does Not Creep Forward In “D” Position"
4-3.Driving tests
AT-6 3
Part 1
❏ AT-203, "
Vehicle Cannot Be Started From D1"
❏ AT-206, "A/T Does Not Shift: D1 → D2"
❏ AT-208, "A/T Does Not Shift: D2 → D3"
❏ AT-210, "A/T Does Not Shift: D3 → D4"
❏ AT-213, "A/T Does Not Shift: D4 → D5"
❏ AT-215, "A/T Does Not Perform Lock-up"
❏ AT-217, "A/T Does Not Hold Lock-up Condition"
❏ AT-219, "Lock-up Is Not Released"
❏ AT-220, "Engine Speed Does Not Return to Idle"

AT-94
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
Display Items List
X: Applicable, —: Not applicable
Items (CONSULT-II
screen terms)Malfunction is detected when...TCM self-
diagnosisOBD-II (DTC)
“A/T” with
CONSULT-IIMIL indicator
lamp*1,
“ENGINE” with
CONSULT-II or
GST
CAN COMM CIRCUIT

When a malfunction is detected in CAN communications U1000 U1000
STARTER RELAY/
CIRC

If this signal is ON other than in P or N position, this is judged to be a
malfunction.
(And if it is OFF in P or N position, this too is judged to be a malfunc-
tion.)P0615 —
TCM

TCM is malfunctioning. P0700 P0700
PNP SW/CIRC

PNP switch 1-4 signals input with impossible pattern

PNP switch 3 monitor terminal cut line

“P” position is detected from N position without any other position
being detected in between.P0705 P0705
VEH SPD SEN/CIR AT
(Revolution sensor)

Signal from vehicle speed sensor A/T (Revolution sensor) not input
due to cut line or the like

Unexpected signal input during running

After ignition switch is turned ON, unexpected signal input from vehicle
speed sensor MTR before the vehicle starts movingP0720 P0720
ENGINE SPEED SIG

TCM does not receive the CAN communication signal from the ECM. P0725 —
TCC SOLENOID/CIRC

Normal voltage not applied to solenoid due to cut line, short, or the like P0740 P0740
A/T TCC S/V FNCTN

A/T cannot perform lock-up even if electrical circuit is good.

TCM detects as irregular by comparing difference value with slip rota-
tion.P0744 P0744*2
L/PRESS SOL/CIRC

Normal voltage not applied to solenoid due to cut line, short, or the like

TCM detects as irregular by comparing target value with monitor value.P0745 P0745
TCM·RAM

TCM memory (RAM) is malfunctioning. P1702 —
TCM·ROM

TCM memory (ROM) is malfunctioning. P1703 —
TP SEN/CIRC A/T

TCM does not receive the proper accelerator pedal position signals
(input by CAN communication) from ECM.P1705 P1705
ATF TEMP SEN/CIRC

During running, the ATF temperature sensor signal voltage is exces-
sively high or lowP1710 P0710
TURBINE REV S/CIRC

TCM does not receive the proper voltage signal from the sensor.

TCM detects an irregularity only at position of 4th gear for turbine revo-
lution sensor 2.P1716 P1716
VEH SPD SE/CIR·MTR

Signal (CAN communication) from vehicle speed sensor MTR not input
due to cut line or the like

Unexpected signal input during runningP1721 —
A/T INTERLOCK

Except during shift change, the gear position and ATF pressure switch
states are monitored and comparative judgement made.P1730 P1730
A/T 1ST E/BRAKING

Each ATF pressure switch and solenoid current is monitored and if a
pattern is detected having engine braking 1st gear other than in the M1
position, a malfunction is detected.P1731 —
I/C SOLENOID/CIRC

Normal voltage not applied to solenoid due to functional malfunction,
cut line, short, or the like

TCM detects as irregular by comparing target value with monitor value.P1752 P1752

DTC P0615 START SIGNAL CIRCUIT
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DTC P0615 START SIGNAL CIRCUITPFP:25230
DescriptionUCS002DE

TCM controls park/neutral (PNP) relay (starter relay) in IPDM E/R.

TCM switches PNP relay “ON” at “P” or “N” position and allows to crank engine.

Then it prohibits cranking other than at “P” or “N” position.
CONSULT-II Reference ValueUCS002DF
On Board Diagnosis LogicUCS002DG

This is not an OBD-II self-diagnostic item.

Diagnostic trouble code “STARTER RELAY/CIRC” with CONSULT-II is detected when detects as irregular
when park/neutral (PNP) relay (starter relay) is switched “ON” other than at “P” or “N” position. (Or when
switched “OFF” at “P” or “N” position).
Possible CauseUCS002D H

Harness or connectors
[The park/neutral position (PNP) relay (starter relay) and TCM circuit is open or shorted.]

Park/neutral position (PNP) relay (starter relay)
DTC Confirmation ProcedureUCS002DI
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
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. Start engine.
4. Drive vehicle for at least 2 consecutive seconds.
5. If DTC is detected, go to AT - 1 0 6 , "
Diagnostic Procedure" .
Item name Condition Display value
STARTER RELAYSelector lever in “N”,“P” position. ON
Selector lever in other position. OFF
BCIA0030E

AT-106
DTC P0615 START SIGNAL CIRCUIT
Revision: August 20072004 QX56
Diagnostic ProcedureUCS002DJ
1. CHECK STARTER RELAY
With CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II and check monitor “STARTER
RELAY” ON/OFF.
Without CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Check the voltage between the IPDM E/R connector and
ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2. DETECT MALFUNCTIONING ITEM
Check the following items:

Starter relay, Refer to SC-10, "STARTING SYSTEM" .

IPDM E/R, Refer to PG-17, "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE
ROOM)" .

Disconnections or short-circuits in the harness between TCM and IPDM E/R.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. CHECK TCM
Perform TCM input/output signals inspection. Refer to AT- 9 0 , "
TCM Input/Output Signal Reference Values" .
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4. DETECT MALFUNCTIONING ITEM
Check the following items:

Power supply and ground circuit for TCM.

The A/T assembly harness connector terminals for damage or loose connection with harness connector.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace damaged parts.
Item name Condition Display value
STARTER RELAYSelector lever in N, P position. ON
Selector lever in other position. OFF
PCIA0056E
Item ConnectorTe r m i n a l
(Wirer color)Shift position Voltage (Approx.)
Sta rte r
relayE12248
(B/R)GroundN and P Battery voltage
R, D and M 0V
LCIA0320E