ECO mode INFINITI QX56 2011 Factory Service Manual

DLN-42
< BASIC INSPECTION >[TRANSFER: ATX90A]
ADDITIONAL SERVICE WHEN
REPLACING TRANSFER ASSEMBLY
ADDITIONAL SERVICE WHEN REPLACING TRANSFER ASSEMBLY
DescriptionINFOID:0000000006222236
Perform writing unit parameter, transfer fluid viscosity learning and initial calibration after replacing transfer
assembly. Refer to DLN-42, "
Work Procedure".
Work ProcedureINFOID:0000000006222237
NOTE:
In fail-safe mode, can not perform work s upport. (Except that DTC P181F is detected.)
1.WRITE UNIT PARAMETER
Perform writing unit parameter to control unit. Refer to DLN-48, "
Work Procedure".
>> GO TO 2.
2.PREPARATION BEFORE WORK
With CONSULT-III
1. Start the engine. CAUTION:
Never drive the vehicle.
2. Check “4WD MODE”, “T/M RANGE”, “COMER V HCL SPEED”, “MOTOR POWER SUP” of CONSULT-III
“DATA MONITOR” for “ALL MODE AWD/4WD”.
3. Continue the following condition more than 10 seconds.
>> GO TO 3.
3.PERFORM TRANSFER FLUID VISCOSITY LEARNING
With CONSULT-III
1. Select “OIL DETERIORATION INFO RESET” of CONSULT-III “WORK SUPPORT” for “ALL MODE AWD/
4WD”.
2. Select “Start”.
>> GO TO 4.
4.INITIAL CALIBRATION
With CONSULT-III
1. Select “START CALIBRATION” of CONSULT- III “WORK SUPPORT” for “ALL MODE AWD/4WD”.
2. Wait until the motor operation stop. (After approximately 10 seconds)
>> GO TO 5.
5.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Erase self-diagnosis result for “ALL MODE AWD/4WD”.
2. Turn the ignition switch ON to OFF. CAUTION:
Wait for 10 seconds after turn ing ignition switch OFF.
3. Start the engine. CAUTION:
Never drive the vehicle.
4. Perform self-diagnosis for “ALL MODE AWD/4WD”.
4WD MODE : AUTO
T/M RANGE : N
COMPER VHCL SPEED : 0 km/h (Never drive the vehicle)
MOTOR POWER SUP : More than 11 V
Revision: 2010 May2011 QX56

TRANSFER LOCK POSITION SENSOR LEARNING
DLN-45
< BASIC INSPECTION > [TRANSFER: ATX90A]
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1. Erase self-diagnosis result for “ALL MODE AWD/4WD”.
2. Turn the ignition switch ON to OFF. CAUTION:
Wait for 10 seconds after turning ignition switch OFF.
3. Start the engine. CAUTION:
Never drive the vehicle.
4. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is
“DTC P182B” detected?
YES >> GO TO 1.
NO >> WORK END
Revision: 2010 May2011 QX56

DLN-46
< BASIC INSPECTION >[TRANSFER: ATX90A]
TRANSFER ROTARY POSITION SENSOR LEARNING
TRANSFER ROTARY POSI
TION SENSOR LEARNING
DescriptionINFOID:0000000006222240
Perform initial calibration after replacing transfer rotary position sensor. Refer to DLN-46, "Work Procedure".
Work ProcedureINFOID:0000000006222241
NOTE:
In fail-safe mode, can not perform work support. (Except that DTC P181F is detected.)
1.INITIAL CALIBRATION
With CONSULT-III
1. Start the engine.
CAUTION:
Never drive the vehicle.
2. Check “4WD MODE”, “T/M RANGE”, “COMER V HCL SPEED”, “MOTOR POWER SUP” of CONSULT-III
“DATA MONITOR” for “ALL MODE AWD/4WD”.
3. Continue the following condition.
4. Select “START CALIBRATION” of CONSULT- III “WORK SUPPORT” for “ALL MODE AWD/4WD”.
5. Wait till the motor operates. (Aprrox. 10 seconds)
>> GO TO 2.
2.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Erase self-diagnosis result for “ALL MODE AWD/4WD”.
2. Turn the ignition switch ON to OFF.
CAUTION:
Wait for 10 seconds after turn ing ignition switch OFF.
3. Start the engine.
CAUTION:
Never drive the vehicle.
4. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is
“DTC P180D” detected?
YES >> GO TO 1.
NO >> WORK END
4WD MODE : AUTO
T/M RANGE : N
COMPER VHCL SPEED : 0 km/h (Never drive the vehicle)
MOTOR POWER SUP : More than 11 V
Revision: 2010 May2011 QX56

TRANSFER FLUID VISCOSITY LEARNINGDLN-47
< BASIC INSPECTION > [TRANSFER: ATX90A]
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TRANSFER FLUID VISCOSITY LEARNING
DescriptionINFOID:0000000006222242
Perform transfer fluid viscosity learning and initial calibration after draining and refilling transfer fluid. Refer to
DLN-47, "
Work Procedure".
Work ProcedureINFOID:0000000006222243
NOTE:
In fail-safe mode, can not perform work s upport. (Except that DTC P181F is detected.)
1.PREPARATION BEFORE WORK
With CONSULT-III
1. Start the engine.
CAUTION:
Never drive the vehicle.
2. Check “4WD MODE”, “T/M RANGE”, “COMER VHCL SPEED”, “MOTOR POWER SUP” of CONSULT-III
“DATA MONITOR” for “ALL MODE AWD/4WD”.
3. Continue the following condition more than 10 seconds.
>> GO TO 2.
2.TRANSFER FLUID VISCOSITY LEARNING
With CONSULT-III
1. Select “OIL DETERIORATION INFO RESET” of CONSULT-III “WORK SUPPORT” for “ALL MODE AWD/
4WD”.
2. Select “Start”.
>> GO TO 3.
3.INITIAL CALIBRATION
With CONSULT-III
1. Select “START CALIBRATION” of CONSULT- III “WORK SUPPORT” for “ALL MODE AWD/4WD”.
2. Wait until the motor operation stop. (After approximately 10 seconds)
>> GO TO 4.
4.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Erase self-diagnosis result for “ALL MODE AWD/4WD”.
2. Turn the ignition switch ON to OFF.
CAUTION:
Wait for 10 seconds after turning ignition switch OFF.
3. Start the engine.
CAUTION:
Never drive the vehicle.
4. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is
“DTC P181F” detected?
YES >> GO TO 1.
NO >> WORK END
4WD MODE : AUTO
T/M RANGE : N
COMPER VHCL SPEED : 0 km/h (Never drive the vehicle)
MOTOR POWER SUP : More than 11 V
Revision: 2010 May2011 QX56

P1802, P1803, P1804, P1809 TRANSFER CONTROL UNIT
DLN-51
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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DTC/CIRCUIT DIAGNOSIS
P1802, P1803, P1804, P1809 TRANSFER CONTROL UNIT
DTC LogicINFOID:0000000006222244
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Are DTC
′s “P1802, P1803, P1804 or P1809” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-51, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222245
1.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Erase self-diagnostic results for “ALL MODE AWD/4WD”.
2. Turn the ignition switch OFF, and then wait 10 seconds and more.
3. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Are DTC
′s “P1802, P1803, P1804 or 1809” detected?
YES >> Replace transfer control unit. Refer to DLN-107, "Removal and Installation".
NO >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace error-detected parts.
DTC Display item Malfunction detected condition Possible cause
P1802 CONTROL UNIT 1 Malfunction is detected in the memory
(RAM) system of transfer control unit.
Internal malfunction of transfer control
unit.
P1803 CONTROL UNIT 2
Malfunction is detected in the memory
(ROM) system of transfer control unit.
P1804 CONTROL UNIT 3 Malfunction is detected in the memory
(EEOROM) system of transfer control
unit.
P1809 CONTROL UNIT 4 AD converter system of transfer control
unit is malfunctioning.
Revision: 2010 May2011 QX56

DLN-78
< DTC/CIRCUIT DIAGNOSIS >[TRANSFER: ATX90A]
P181F INCOMPLETE CALIBRATION
P181F INCOMPLETE CALIBRATION
DTC LogicINFOID:0000000006222281
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P181F” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-78, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222282
1.PERFORM INITIAL CALIBRATION
1. Erase self-diagnostic result for “ALL MODE AWD/4WD”.
2. Perform initial calibration. Refer to DLN-41, "
Work Procedure".
3. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is any DTC except
“P181F” detected?
YES >> Check DTC.
NO >> GO TO 2.
2.PERFORM SELF-DIAGNOSIS
With CONSULT-III
1. Erase self-diagnostic result for “ALL MODE AWD/4WD”.
2. Turn the ignition switch OFF, and then wait 10 seconds or more.
3. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“P181F” detected?
YES >> Replace transfer control unit. Refer to DLN-107, "Removal and Installation".
NO >> Check transfer control unit pin terminals fo r damage or loose connection with harness connector.
If any items are damaged, repair or replace the error-detected parts.
DTC Display item Malfunction detected condition Possible cause
P181F INCOMP CALIBRATION When incomplete calibration of transfer
control unit is detected.Initial calibration of transfer is incom-
plete
Revision: 2010 May2011 QX56

U1000 CAN COMM CIRCUITDLN-91
< DTC/CIRCUIT DIAGNOSIS > [TRANSFER: ATX90A]
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U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006222300
CAN (Controller Area Network) is a serial communication li ne for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic 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 connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit communicate data but selectively reads required data only.
DTC LogicINFOID:0000000006222301
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC REPRODUCTION PROCEDURE
With CONSULT-III
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“U1000” detected?
YES >> Proceed to diagnosis procedure. Refer to DLN-91, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222302
1.PERFORM SELF-DIAGNOSIS
With CONSULT-III
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC
“U1000” detected?
YES >> Proceed to LAN-18, "Trouble Diagnosis Flow Chart".
NO >> INSPECTION END
DTC Display item Malfunction detected condition Possible cause
U1000 CAN COMM CIRCUIT Transfer control unit is not transmitting/
receiving CAN communication signal for
2 seconds or more. CAN communication error
 Malfunction of transfer control unit
Revision: 2010 May2011 QX56

EC-8
P2A00, P2A03 A/F SENSOR 1 .......................487
DTC Logic ............................................................ ..487
Diagnosis Procedure .............................................487
ASCD BRAKE SWITCH ................................. .490
Component Function Check ................................ ..490
Diagnosis Procedure .............................................490
Component Inspection (ASCD Brake Switch) .......491
ASCD INDICATOR ..........................................492
Component Function Check ................................ ..492
Diagnosis Procedure .............................................492
ELECTRICAL LOAD SIGNAL .........................493
Description ........................................................... ..493
Component Function Check ..................................493
Diagnosis Procedure .............................................493
ELECTRICALLY-CONTROLLED COOLING
FAN COUPLING ..............................................
495
Component Function Check ................................ ..495
Diagnosis Procedure .............................................495
FUEL INJECTOR .............................................498
Component Function Check ................................ ..498
Diagnosis Procedure .............................................498
Component Inspection ...........................................499
HIGH PRESSURE FUEL PUMP ......................501
Component Function Check ................................ ..501
Diagnosis Procedure .............................................501
Component Inspection ...........................................502
ICC BRAKE SWITCH ......................................503
Component Function Check ................................ ..503
Diagnosis Procedure .............................................503
Component Inspection (ICC Brake Switch) ...........505
IGNITION SIGNAL ...........................................506
Component Function Check ................................ ..506
Diagnosis Procedure .............................................506
Component Inspection (Ignition Coil with Power
Transistor) .............................................................
509
Component Inspection (Condenser) ......................510
INFORMATION DISPLAY (ASCD) ..................511
Component Function Check ................................ ..511
Diagnosis Procedure .............................................511
LOW PRESSURE FUEL PUMP ......................512
Component Function Check ................................ ..512
Diagnosis Procedure .............................................512
Component Inspection (Low Pressure Fuel Pump)
..
513
Component Inspection (FPCM) .............................514
MALFUNCTION INDICATOR LAMP ...............515
Component Function Check ................................ ..515
Diagnosis Procedure .............................................515
ON BOARD REFUELING VAPOR RECOV-
ERY (ORVR) .....................................................
516
Component Function Check ................................ .516
Diagnosis Procedure .............................................516
Component Inspection (EVAP Vapor Cut Valve) . .518
REFRIGERANT PRESSURE SENSOR ......... ..520
Component Function Check ................................ .520
Diagnosis Procedure .............................................520
SNOW MODE SWITCH ....................................522
Description ........................................................... .522
Component Function Check .................................522
Diagnosis Procedure .............................................522
Component Inspection ..........................................523
SYMPTOM DIAGNOSIS ...........................524
ENGINE CONTROL SYSTEM SYMPTOMS .. ..524
Symptom Table .................................................... .524
NORMAL OPERATING CONDITION ...............529
Description ........................................................... .529
PERIODIC MAINTENANCE ......................530
IDLE SPEED .......................... ...........................530
Inspection ............................................................. .530
IGNITION TIMING .............................................531
Inspection ............................................................. .531
EVAP LEAK CHECK ........................................532
Inspection ............................................................. .532
POSITIVE CRANKCASE VENTILATION .........534
Inspection ............................................................. .534
REMOVAL AND INSTALLATION .............535
ECM ................................................................ ..535
Removal and Installation ...................................... .535
VVEL CONTROL MODULE .............................536
Removal and Installation ...................................... .536
FUEL PUMP CONTROL MODULE (FPCM) ....537
Removal and Installation ...................................... .537
SERVICE DATA AND SPECIFICATIONS
(SDS) ........ .................................................
538
SERVICE DATA AND SPECIFICATIONS
(SDS) .............................................................. ..
538
Idle Speed ............................................................ .538
Ignition Timing .......................................................538
Calculated Load Value ..........................................538
Mass Air Flow Sensor ...........................................538
Revision: 2010 May2011 QX56

EC-52
< SYSTEM DESCRIPTION >[VK56VD]
DIAGNOSIS SYSTEM (ECM)
DIAGNOSIS SYSTEM (ECM)
DIAGNOSIS DESCRIPTION
DIAGNOSIS DESCRIPTION : 1st Trip Detect
ion Logic and Two Trip Detection Logic
INFOID:0000000006217722
When a malfunction is detected for the first time, 1st tr ip DTC and 1st trip Freeze Frame data are stored in the
ECM memory. The MIL will not illuminate at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MIL illuminates. The MIL illu minates at the same time when the DTC is stored.
<2nd trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is per-
formed during vehicle operation. Specific on board diagnos tic items will cause the ECM to illuminate or blink
the MIL, and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
×: Applicable —: Not applicable
DIAGNOSIS DESCRIPTION : DT C and Freeze Frame DataINFOID:0000000006217723
DTC AND 1ST TRIP DTC
The 1st trip DTC (whose number is the same as the DT C number) is displayed for the latest self-diagnostic
result obtained. If the ECM memory was cleared previously , and the 1st trip DTC did not recur, the 1st trip DTC
will not be displayed.
If a malfunction is detected during the 1st trip, the 1st trip DTC is saved in the ECM memory. The MIL will not
light up (two trip detection logic). If the same malfunc tion is not detected in the 2nd trip (meeting the required
driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the
2nd trip, both the 1st trip DTC and DTC are saved in the ECM memory and the MIL lights up. In other words,
the DTC is stored in the ECM memory and the MIL light s up when the same malfunction occurs in two consec-
utive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd
trips, only the 1st trip DTC will continue to be stored. Fo r malfunctions that blink or light up the MIL during the
1st trip, the DTC and 1st trip DTC are stored in the ECM memory.
For malfunctions in which 1st trip DTCs are displayed, refer to EC-98, "
DTC Index". These items are required
by legal regulations to continuous ly monitor the system/component. In addi tion, the items monitored non-con-
tinuously are also displayed on CONSULT-III.
1st trip DTC is specified in Service $07 of SAE J1979/ ISO 15031-5. 1st trip DTC detection occurs without illu-
minating the MIL and therefore does not warn the driver of a malfunction.
When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame
data as specified in Work Flow procedure Step 2, refer to EC-135, "
Work Flow". Then perform DTC Confirma-
tion Procedure or Component Function Check to try to duplicate the malfunction. If the malfunction is dupli-
cated, the item requires repair.
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA
The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant tem-
perature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, absolute throttle position, base
fuel schedule and intake air temperature at the moment a malfunction is detected.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, stored together with the DTC data, are ca lled 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.
Items MIL DTC 1st trip DTC
1st trip 2nd trip 1st trip
displaying 2nd trip
displaying 1st trip
displaying 2nd trip
displaying
Blinking Illuminate Blinking Illuminate
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0308 is
being detected ×
——— — — ×—
Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0308 is
being detected ——
×—— ×——
One trip detection diagnoses (Re-
fer to EC-98, "
DTC Index".) —
×—— ×———
Except above — — — ×— ×× —
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (ECM)EC-53
< SYSTEM DESCRIPTION > [VK56VD]
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Only one set of freeze frame data (either 1st trip freez
e frame data or freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM me mory 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
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.
For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was saved in the 2nd
trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated
from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal-
function is detected. There is no priority for 1st tr ip freeze frame data. However, once freeze frame data is
stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st
trip freeze frame data can be stored in the ECM). If fr eeze frame data is stored in the ECM memory and freeze
frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged in the
ECM memory.
Both 1st trip freeze frame data and freeze frame dat a (along with the DTCs) are cleared when the ECM mem-
ory is erased.
DIAGNOSIS DESCRIPTION : Counter SystemINFOID:0000000006217724
RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS
 When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are
stored in the ECM memory.
 When the same malfunction is detected in two consec utive trips, the DTC and the freeze frame data are
stored in the ECM memory, and the MIL will come on.
 The MIL will turn OFF after the vehicle is driven 3 ti mes (driving pattern B) with no malfunction. The drive is
counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs
while counting, the counter will reset.
 The DTC and the freeze frame data will be stored until the v ehicle is driven 40 times (driving pattern A) with-
out the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel Injec-
tion System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times (driving pattern
C) without the same malfunction recurring. The “TIM E” in “SELF-DIAGNOSTIC RESULTS” mode of CON-
SULT-III will count the number of times the vehicle is driven.
 The 1st trip DTC is not displayed when the se lf-diagnosis results in OK for the 2nd trip.
COUNTER SYSTEM CHART
For details about patterns B and C under “Fuel Inject ion System” and “Misfire”, see “EXPLANATION FOR
DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUAL ITY DETERIORATION>”, “FUEL INJECTION SYS-
TEM”.
For details about patterns A and B under Other, see “EXPLANATION FOR DRIVING PATTERNS FOR “MIS-
FIRE <EXHAUST QUALITY DETERIOR ATION>”, “FUEL INJECTION SYSTEM”.
 *1: Clear timing is at the moment OK is detected.
 *2: Clear timing is when the same malfunction is detected in the 2nd trip.
Relationship Between MIL, DTC, 1st Trip DTC and Dr iving Patterns for “Misfire <Exhaust Quality De-
terioration>”, “Fuel Injection System”
Priority Items
1 Freeze frame data Misfire — DTC: P0300 - P0308
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175
2 Except the above items
3 1st trip freeze frame data
Items Fuel Injection System Misfire Other
MIL (turns OFF) 3 (pattern B) 3 (pattern B) 3 (pattern B)
DTC, Freeze Frame Data (no display) 80 (p attern C) 80 (pattern C) 40 (pattern A)
1st Trip DTC (clear) 1 (pattern C), *1 1 (pattern C), *1 1 (pattern B)
1st Trip Freeze Frame Data (clear) *1, *2 *1, *2 1 (pattern B)
Revision: 2010 May2011 QX56