Infiniti QX56 (JA60). Manual — part 932
TM-30
< FUNCTION DIAGNOSIS >
ON BOARD DIAGNOSTIC (OBD) SYSTEM
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Introduction
INFOID:0000000005148521
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,
TM-32, "CONSULT-III Function (TRANSMISSION)"
OBD-II Function for A/T System
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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-II
INFOID:0000000005148523
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. — 1st Trip
If the same malfunction as that experienced during the first test drive is sensed during the second test drive,
the MIL will illuminate. — 2nd 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)
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HOW TO READ DTC AND 1ST TRIP DTC
DTC and 1st trip DTC can be read by the following methods.
( with CONSULT-III or GST) CONSULT-III or GST (Generic Scan Tool) Examples: P0705, P0720 etc.
These DTC are prescribed by SAE J2012.
(CONSULT-III 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-III can identify them as shown below, therefore, CONSULT-III (if available) is recom-
mended.
Freeze Frame Data and 1st Trip Freeze Frame Data
The ECM has a memory function, which stores the driving condition such as fuel system status, calculated
load value, engine coolant temperature, short term fuel trim, long term fuel trim, engine speed and vehicle
speed at the moment the ECM detects a malfunction.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data,
and the data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-III
or GST. The 1st trip freeze frame data can only be displayed on the CONSULT-III screen, not on the GST. For
Only one set of freeze frame data (either 1st trip freeze frame data of freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority
for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no
ON BOARD DIAGNOSTIC (OBD) SYSTEM
TM-31
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longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-
lowing priorities to update the data.
Both 1st trip freeze frame data and freeze frame data (along with the DTC) are cleared when the ECM mem-
ory is erased.
HOW TO ERASE DTC
The diagnostic trouble code can be erased by CONSULT-III, GST or ECM DIAGNOSTIC TEST MODE as
described following.
• If the battery cable is disconnected, the diagnostic trouble code will be lost within 24 hours.
• When you erase the DTC, using CONSULT-III or GST is easier and quicker than switching the mode
selector on the ECM.
The following emission-related diagnostic information is cleared from the ECM memory when erasing DTC
related to OBD-II. For details, refer to
EC-42, "Emission-related Diagnostic Information"
.
• Diagnostic trouble codes (DTC)
• 1st trip diagnostic trouble codes (1st trip DTC)
• Freeze frame data
• 1st trip freeze frame data
• System readiness test (SRT) codes
• Test values
HOW TO ERASE DTC (WITH CONSULT-III)
1. The emission related diagnostic information in the TCM and ECM can be erased by selectioning "ALL
ERASE" in the "Description" of "FINAL CHECK" mode with CONSULT-III.
HOW TO ERASE DTC (WITH GST)
1. If the ignition switch stays “ON” after repair work, be sure to turn ignition switch “OFF” once. Wait at least
10 seconds and then turn it “ON” (engine stopped) again.
2. Select Mode 4 with the Generic Scan Tool (GST). For details refer to
EC-72, "Generic Scan Tool (GST)
HOW TO ERASE DTC (NO TOOLS)
1. Disconnect battery for 24 hours.
2. Reconnect battery.
Malfunction Indicator Lamp (MIL)
INFOID:0000000005148525
DESCRIPTION
The MIL is located on the instrument panel.
1. The MIL will light up when the ignition switch is turned “ON” with-
out the engine running. This is a bulb check.
• If the MIL does not light up, refer to
2. When the engine is started, the MIL should go off.
If the MIL remains on, the on board diagnostic system has
detected an engine system malfunction.
Priority
Items
1
Freeze frame data
Misfire — DTC: P0300 - P0306
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175
2
Except the above items (Includes A/T related items)
3
1st trip freeze frame data
SEF217U
TM-32
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (TCM)
DIAGNOSIS SYSTEM (TCM)
CONSULT-III Function (TRANSMISSION)
INFOID:0000000005148526
CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
SELF-DIAGNOSTIC RESULT MODE
Display Items List
X: Applicable, —: Not applicable
TCM diagnostic mode
Description
Work Support
This mode enables a technician to adjust some devices faster and more accurately.
Self-Diagnostic Results
Retrieve DTC from ECU and display diagnostic items.
Data Monitor
Monitor the input/output signal of the control unit in real time.
CAN Diagnosis Support Monitor
It monitors the status of CAN communication.
DTC & SRT Confirmation
The status of system monitoring tests and the self-diagnosis status/result can be confirmed.
ECU Identification
Display the ECU identification number (part number etc.) of the selected system.
Items (CONSULT-III
screen terms)
Malfunction is detected when...
TCM self-di-
agnosis
OBD (DTC)
Reference
“TRANSMIS-
SION” with
CONSULT-III
MIL indicator
lamp*1, “EN-
GINE” with
CONSULT-III or
GST
CAN COMM CIRCUIT
• When a malfunction is detected in CAN communica-
tions.
U1000
U1000
STARTER RELAY
• 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 malfunction.)
P0615
—
TRANSMISSION CON-
TROL
• TCM is malfunctioning.
P0700
P0700
T/M RANGE SWITCH A
• Transmission range switch 1-4 signals input with im-
possible pattern.
• “P” position is detected from “N” position without any
other position being detected in between.
P0705
P0705
INPUT SPEED SEN-
SOR A
• TCM does not receive the proper voltage signal from
the sensor.
• TCM detects an irregularity only at position of 4GR for
input speed sensor 2.
P0717
P0717
OUTPUT SPEED SEN-
SOR
• Signal from output speed 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 signal before the vehicle
starts moving.
P0720
P0720
ENGINE SPEED
• TCM does not receive the CAN communication signal
from the ECM.
P0725
—
1GR INCORRECT RA-
TIO
• A/T cannot shift to 1GR.
P0731
P0731
2GR INCORRECT RA-
TIO
• A/T cannot shift to 2GR.
P0732
P0732
3GR INCORRECT RA-
TIO
• A/T cannot shift to 3GR.
P0733
P0733
DIAGNOSIS SYSTEM (TCM)
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4GR INCORRECT RA-
TIO
• A/T cannot shift to 4GR.
P0734
P0734
5GR INCORRECT RA-
TIO
• A/T cannot shift to 5GR.
P0735
P0735
TORQUE CONVERT-
ER
• Normal voltage not applied to solenoid due to cut line,
short, or the like.
P0740
P0740
TORQUE CONVERT-
ER
• A/T cannot perform lock-up even if electrical circuit is
good.
• TCM detects as irregular by comparing difference val-
ue with slip rotation.
P0744
P0744*2
PC SOLENOID A
• 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
TP SENSOR
• TCM does not receive the proper accelerator pedal po-
sition signals (input by CAN communication) from
ECM.
P1705
P1705
FLUID TEMP SENSOR
• During running, the ATF temperature sensor signal
voltage is excessively high or low.
P1710
P0710
VEHICLE SPEED SIG-
NAL
• Signal (CAN communication) from vehicle speed sig-
nal not input due to cut line or the like.
• Unexpected signal input during running.
P1721
—
INTERLOCK
• Except during shift change, the gear position and ATF
pressure switch states are monitored and comparative
judgement made.
P1730
P1730
1GR E/BRAKING
• Each ATF pressure switch and solenoid current is
monitored and if a pattern is detected having engine
braking 1GR other than in the "1" position, a malfunc-
tion is detected.
P1731
—
INPUT CLUTCH SOLE-
NOID
• Normal voltage not applied to solenoid due to function-
al malfunction, cut line, short, or the like.
• TCM detects as irregular by comparing target value
with monitor value.
P1752
P1752
FR BRAKE SOLENOID
• Normal voltage not applied to solenoid due to function-
al malfunction, cut line, short, or the like.
• TCM detects as irregular by comparing target value
with monitor value.
P1757
P1757
DRCT CLUTCH SOLE-
NOID
• 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.
P1762
P1762
HLR CLUTCH SOLE-
NOID
• Normal voltage not applied to solenoid due to function-
al malfunction, cut line, short, or the like.
• TCM detects as irregular by comparing target value
with monitor value.
P1767
P1767
L C BRAKE SOLENOID
• Normal voltage not applied to solenoid due to function-
al malfunction, cut line, short, or the like.
P1772
P1772
Items (CONSULT-III
screen terms)
Malfunction is detected when...
TCM self-di-
agnosis
OBD (DTC)
Reference
“TRANSMIS-
SION” with
CONSULT-III
MIL indicator
lamp*1, “EN-
GINE” with
CONSULT-III or
GST
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