ECM power SUZUKI SWIFT 2006 2.G Service User Guide

Downloaded from www.Manualslib.com manuals search engine 1A-26 Engine General Information and Diagnosis:
DTC CheckS7RS0B1104003
NOTE
• There are two types of OBD system depending on the vehicle specification.
For details, refer to “Precaution on On-
Board Diagnostic (OBD) System”.
• The MIL is turned on when the ECM and/or TCM detect malfunction(s). Each ECM and
TCM stores diagnostic information as the
diagnostic trouble code (DTC) in its
memory and outputs th e DTC to the scan
tool.
Therefore, check both of the ECM and TCM
for any DTC with the SUZUKI scan tool
because the DTC stored in ECM and TCM
is not read and displayed at a time.
However, each of the ECM and TCM needs
not to be checked with the generic scan
tool because the DTC stored in ECM and
TCM is read and displayed at a time.

Using Scan Tool
1) Prepare OBD generic scan tool or SUZUKI scan tool.
2) With ignition switch turned OFF, connect it to DLC (1) located on underside of instrument panel at
driver’s seat side.
Special tool
(A): SUZUKI scan tool
3) Turn ignition switch ON and confirm that MIL lights.
4) Read DTC, pending DTC and freeze frame data according to instructions displayed on scan tool and
print them or write them down. Refer to scan tool
operator’s manual for further details.
If communication between scan tool and ECM is not
possible, check if scan tool is communicable by
connecting it to ECM in another vehicle. If
communication is possible in this case, scan tool is
in good condition. Then check data link connector
and serial data line (circuit) in the vehicle with which
communication was not possible. If connector and
circuit are OK, check that power supply and ground
circuits of ECM and DLC are in good condition
referring to “ECM Power and Ground Circuit Check”. 5) After completing the check,
turn ignition switch OFF
and disconnect scan tool from data link connector.
Without Using Scan Tool (Hong Kong Model) 1) Turn ignition switch to OFF position.
2) Using service wire, ground diagnosis switch terminal (1) of diagnosis connector (2).
3) Turn ON ignition switch and check DTC displayed on
odometer (3) of combination meter.
When more than 2 DTCs are stored in memory,
blinking for each DTC star ts with the smallest DTC
number in increasing order. Also, DTC is indicated
repeatedly until the ignition switch is turned OFF or
disconnect service wire.
NOTE
When no DTC is detected, display on
odometer of combinatio n meter is “0000”.

4) After completing the check, turn ignition switch to
OFF position and disconnect service wire from
diagnosis connector.
(A)
1
I4RS0B110026-01
21
3
I5RS0C110009-01

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-27
DTC ClearanceS7RS0B1104004
NOTE
There are two types of OBD system
depending on the vehicle specification.
For details, refer to “Precaution on On-Board
Diagnostic (OBD) System”.

Using Scan Tool1) Connect OBD generic scan to ol or SUZUKI scan tool
to data link connector in the same manner as when
making this connection for DTC check.
2) Turn ignition switch OFF and then ON.
3) Erase DTC and pending DTC according to instructions displayed on scan tool. Refer to scan
tool operator’s manual for further details.
4) After completing the clear ance, turn ignition switch
OFF and disconnect scan tool from data link
connector.
NOTE
DTC and freeze frame data stored in ECM
memory are also cleared in the following
cases. Be careful not to clear them before
keeping their record.
• When power to ECM is cut off (by disconnecting battery cable, removing
fuse or disconnecting ECM connectors).
• When the same malfunction (DTC) is not detected again during 40 engine warm-up
cycles. (See “Warm-Up Cycle” of “On-
Board Diagnostic System Description”.)

Without Using Scan Tool (Hong Kong Model)
1) Turn ignition switch to OFF position.
2) Disconnect battery negative cable for specified time below to erase diagnostic trouble code stored in
ECM memory and reconnect it.
Time required to erase DTC
DTC TableS7RS0B1104005
NOTE
• There are two types of OBD system depending on the vehicle specification.
• For details, refer to “Precaution on On-Board Diagnostic (OBD) System”.
• For non-Euro-OBD model, some of DTC No. with delta ( U) mark in the following table can not be
detected by ECM depending on vehicl e specification and local regulation.
• DTC with square ( †) mark in the following table can be detected only for Hong Kong model.
• DTC with circle ( {) mark in the following table can be detected only for Euro OBD model and Hong
Kong model.
• For Euro OBD model, with the generic scan tool, onl y star (*) marked DTC No. in the following table
can be read.
• 1 driving cycle: MIL lights up when DTC is detected during 1 driving cycle.
• 2 driving cycles: MIL lights up when the same DTC is detected also in the next driving cycle after DTC is detected and stored temporarily in the first driving cycle.
• *2 driving cycles: MIL blinks or lights up. Refer to “DTC P0300 / P0301 / P0302 / P0303 / P0304: Random / Multiple
Cylinder Misfire Detected / Cylinder 1 / Cylinder 2 / Cylinder 3 / Cylinder 4 Misfire Detected” for
details.

Ambient temperature Time to cut power to ECM
Over 0 °C (32 ° F) 30 sec. or longer
Under 0 °C (32 °F) Not specifiable.
Select a place with higher
than 0 °C (32 °F)
temperature.
DTC No. Detecting item Detecting condition
(DTC will set when detecting:) MIL
) *P0010 “A” camshaft position actuator
circuit Oil control valve circuit open or short. 1 driving
cycle
) *P0011 “A” camshaft position – timing
over-advanced or system
performance Actual value of advanced va
lve timing does not reach
target value, or valve timi ng is advanced although ECM
command is most retarding. 2 driving
cycles
) *P0012 “A” camshaft position – timing
over-retarded 2 driving
cycles

Downloaded from www.Manualslib.com manuals search engine 1A-30 Engine General Information and Diagnosis:
)
U *P0617 Starter relay circuit high Starter signal is high voltage for specified time while
engine is running. 2 driving
cycles
) P0620 Generator control circuit Battery voltage is higher than specification even through
generator control is maximum regulation, or battery
voltage is lower than specification even through generator
control is minimum regulation
and electric load is less
than 15 A. —
) P0625 Generator field/F terminal
circuit low Generator field coil duty is
0% (high voltage) for more
than specified time even through generator control is
minimum regulation. —
) P0626 Generator field/F terminal
circuit high Generator field coil duty is
100% (low voltage) for more
than specified time even through generator control is
maximum regulation, or generator field coil duty is 100%
(low voltage) when engine is starting. —
) P1501 Electric load current sensor
circuit low Electric load current is lowe
r than specified value (electric
load current sensor voltage is higher than specified
value). —
) P1502 Electric load current sensor
circuit high Electric load current is higher than specified value
(electric load current sens
or voltage is lower than
specified value). —
)
U *P1510 ECM backup power supply
malfunction Backup power voltage is out of
specification after starting
engine. 1 driving
cycle
) † P1603 TCM trouble code detected When ECM receives a trouble code from TCM, which
indicates that some problem occurred in sensor circuits
and its calculated values used for operations such as idle
speed control, engine power control and so on by TCM,
this DTC is detected by ECM. —
) *P1674 CAN communication (buss off
error) Transmission error that
is inconsistent between
transmission data and transmission monitor (CAN bus
monitor) data is detected more than 7 times continuously. 1 driving
cycle
)
† *P1676 CAN communication (reception
error for TCM) Reception error of communication data for TCM is
detected for longer than specified time continuously. 1 driving
cycle
) P1678 CAN communication (reception
error for BCM) Reception error of communication data for BCM is
detected for longer than specified time continuously.
—
) *P1685 CAN communication (reception
error for ABS/ESP
® control
module) Reception error of communication data for ABS/ESP
®
co

ntrol module is detected for longer than specified time
continuously. 1 driving
cycle
) *P2101 Throttle actuator control motor
circuit range/performance Monitor signal of throttle actuator output (duty output) is
inconsistent with throttle actuator control command. 1 driving
cycle
) *P2102 Throttle actuator control motor
circuit low Power supply voltage of throttle actuator control circuit is
lower than specification even
if throttle actuator control
relay turned on. 1 driving
cycle
) *P2103 Throttle actuator control motor
circuit high Power supply voltage of throttle actuator control circuit is
higher than specification even if throttle actuator control
relay turned off. 1 driving
cycle
) *P2111 Throttle actuator control
system – stuck open Throttle valve default opening is greater than specified
value from complementary closed position when
diagnosing throttle valve at ignition switch turned OFF. 1 driving
cycle
) *P2112 Throttle actuator control
system – stuck closed Throttle valve default opening is smaller than specified
value from complementary closed position when
diagnosing throttle valve at ignition switch turned OFF. 1 driving
cycle
) *P2119 Throttle actuator control throttle
body range/performance Difference between actual throttle valve opening angle
and opening angle calculated by ECM is more than
specification. 1 driving
cycle
) *P2122 Throttle/pedal position sensor/
switch “D” (main) circuit low
input Output voltage of APP sensor (main) is lower than
specification.
1 driving
cycle
DTC No. Detecting item
Detecting condition
(DTC will set when detecting:) MIL

Downloaded from www.Manualslib.com manuals search engine 1A-36 Engine General Information and Diagnosis:
O2S B1 S1 ACT (HEATED OXYGEN SENSOR-1,
ACTIVE / INACTIVE)
This parameter indicates activation condition of HO2S-1.
ACTIVE: Activating
INACTIVE: warming up or at stop
O2S SENSOR B1 S2 (HEATED OXYGEN SENSOR-2,
V)
It indicates output voltage of HO2S-2 installed on
exhaust pipe (post-catalyst). It is used to detect catalyst
deterioration.
O2S B1 S2 ACT (HEATED OXYGEN SENSOR-2,
ACTIVE / INACTIVE)
This parameter indicates acti vation condition of HO2S-2.
ACTIVE: Activating
INACTIVE: warming up or at stop
FUEL SYSTEM (FUEL SYSTEM STATUS)
Air/fuel ratio feedback loop status displayed as one of
the followings.
OPEN: Open-loop has not yet satisfied conditions to go
closed loop.
CLOSED: Closed-loop using oxygen sensor(s) as
feedback for fuel control.
OPEN-DRIVE COND: Open-loop due to driving
conditions (Power enrichment, etc.).
OPEN SYS FAULT: Open-loop due to detected system
fault.
MAP (MANIFOLD ABSOLUTE PRESSURE, in.Hg,
kPa)
This value indicates how much correction is necessary
to keep the air/fuel mixture stoichiometrical.
It is detected by manifold absolute pressure sensor.
BAROMETRIC PRESS (kPa, in.Hg)
This parameter represents a measurement of barometric
air pressure and is used for al titude correction of the fuel
injection quantity and IAC valve control.
STEP EGR FLOW DUTY (%)
This parameter indicates opening rate of EGR valve
which controls the amount of EGR flow.
FUEL CUT (ON/OFF)
ON: Fuel being cut (output signal to injector is stopped)
OFF: Fuel not being cut
A/C PRESSURE (A/C REFRIGERANT ABSOLUTE
PRESSURE, kPa)
This parameter indicates A/C refrigerant absolute
pressure calculated by ECM.
CLOSED THROTTLE PO S (CLOSED THROTTLE
POSITION, ON/OFF)
This parameter reads ON wh en throttle valve is fully
closed, or OFF when it is not fully closed. CANIST PRG DUTY (EVAP CANISTER PURGE FLOW
DUTY, %)
This parameter indicates valve ON (valve open) time
rate within a certain set cycle of EVAP canister purge
valve which controls the amount of EVAP purge.
IGNITION ADVANCE (IGNITION TIMING ADVANCE
FOR NO.1 CYLINDER,
°)
Ignition timing of No.1 cylinder is commanded by ECM.
The actual ignition timing should be checked by using
the timing light.
BATTERY VOLTAGE (V)
This parameter indicates battery positive voltage
inputted from main relay to ECM.
FUEL PUMP (ON/OFF)
ON is displayed when ECM activates the fuel pump via
the fuel pump relay switch.
ELECTRIC LOAD (ON/OFF)
ON: Headlight or small light ON signal inputted.
OFF: Above electric loads all turned OFF.
BRAKE SW (ON/OFF)
This parameter indicates the state of the brake switch.
RADIATOR COOLING FAN (RADIATOR COOLING
FAN CONTROL RELAY, ON/OFF)
ON: Command for radiator cooling fan control relay
operation being output.
OFF: Command for relay operation not being output.
BLOWER FAN (ON/OFF)
This parameter indicates the state of the blower fan
motor switch.
A/C SWITCH (ON/OFF)
ON: Command for A/C operatio n being output from ECM
to HVAC.
OFF: Command for A/C oper ation not being output.
A/C COMP RELAY (A/C COMPRESSOR RELAY, ON/
OFF)
This parameter indicates the state of the A/C switch.
VEHICLE SPEED (km/h, mph)
It is computed based on pulse signals from vehicle
speed sensor.
VVT GAP (TARGET-ACTUAL POSITION, °)
It is calculated using the formula: target valve timing
advance – actual valve timing advance.
TP SENSOR 1 VOLT (THROTTLE POSITION SENSOR
(MAIN) OUTPUT VOLTAGE, V)
The TP sensor (main) reading provides throttle valve
opening information in the form of voltage.

Downloaded from www.Manualslib.com manuals search engine 1A-44 Engine General Information and Diagnosis:
Engine hesitates –
Momentary lack of
response as accelerator
is depressed. Can occur
at all vehicle speeds.
Usually most severe when
first trying to make
vehicle move, as from a
stop sign.Spark plug faulty
“Spark Plug Inspection in Section 1H”
Leaky high-tension cord “High-Tension Cord Inspection in Section 1H”
Fuel pressure out of specification “Fuel Pressure Check”
Malfunctioning EGR valve “EGR Valve Inspection in Section 1B”
Poor performance of ECT sensor or
MAF sensor “ECT Sensor Inspection in Section 1C” or
“MAF and IAT Sensor Inspection in Section
1C”
Faulty electric throttle body assembly “Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly “APP Sensor Assembly Inspection in Section
1C”
Faulty fuel injector “Fuel Injector Circuit Check”
Faulty ECM
Engine overheating Condition “Engine overheating”
Low compression “Compression Check in Section 1D”
Camshaft position control (VVT) system
out of order “Oil Control Valve Inspection in Section 1D”
Surge – Engine power
variation under steady
throttle or cruise. Feels
like vehicle speeds up
and down with no change
in accelerator pedal. Leaky or loosely connected high-tension
cord
“High-Tension Cord Removal and Installation
in Section 1H”
Faulty spark plug (excess carbon
deposits, improper gap, burned
electrodes, etc.) “Spark Plug Inspection in Section 1H”
Variable fuel pressure “Fuel Pressure Check”
Kinky or damaged fuel hose and lines
Faulty fuel pump (clogged fuel filter)
Malfunctioning EGR valve “EGR Valve Inspection in Section 1B”
Poor performance of MAF sensor “MAF and IAT Sensor Inspection in Section
1C”
Faulty fuel injector “Fuel Injector Circuit Check”
Faulty electric throttle body assembly “Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly “APP Sensor Assembly Inspection in Section
1C”
Faulty ECM
Excessive detonation –
Engine makes
continuously sharp
metallic knocks that
change with throttle
opening. Sounds like pop
corn popping. Faulty spark plug
“Spark Plug Inspection in Section 1H”
Loose connection of high-tension cord “High-Tension Cord Removal and Installation
in Section 1H”
Engine overheating Condition “Engine overheating”
Clogged fuel filter (faulty fuel pump) or
fuel lines “Fuel Pressure Check” or “Fuel Pump and Its
Circuit Check”
Air drawn in through intake manifold or
throttle body gasket
Malfunctioning EGR valve “EGR Valve Inspection in Section 1B”
Poor performance of knock sensor, ECT
sensor or MAF sensor “DTC P0327 / P0328: Knock Sensor 1 Circuit
Low / High”, “ECT Sensor Inspection in
Section 1C” or “MAF and IAT Sensor
Inspection in Section 1C”
Faulty fuel injector(s) “Fuel Injector Circuit Check”
Faulty ECM
Excessive combustion chamber
deposits “Cylinders, Pistons and Piston Rings
Inspection in Section 1D” and/or “Piston Pins
and Connecting Rods In
spection in Section
1D”
Camshaft position control (VVT) system
out of order “Oil Control Valve Inspection in Section 1D”
Condition Possible cause Correction / Reference Item

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-45
Engine has no powerFaulty spark plug “Spark Plug Inspection in Section 1H”
Faulty ignition coil with ignitor “Ignition Coil Assembly (Including ignitor)
Inspection in Section 1H”
Leaks, loose connection or
disconnection of high-tension cord “High-Tension Cord Removal and Installation
in Section 1H”
Faulty knock sensor “DTC P0327 / P0328: Knock Sensor 1 Circuit
Low / High”
Clogged fuel hose or pipe “Fuel Pressure Check”
Malfunctioning fuel pump “Fuel Pump and Its Circuit Check”
Air drawn in through intake manifold
gasket or throttle body gasket
Engine overheating Condition “Engine overheating”
Malfunctioning EGR valve “EGR Valve Inspection in Section 1B”
Poor performance of ECT sensor or
MAF sensor “ECT Sensor Inspection in Section 1C” or
“MAF and IAT Sensor Inspection in Section
1C”
Faulty electric throttle body assembly “Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly “APP Sensor Assembly Inspection in Section
1C”
Faulty fuel injector(s) “Fuel Injector Circuit Check”
Faulty ECM
Dragging brakes Condition “Dragging brakes” in “Brakes
Symptom Diagnosis in Section 4A”
Slipping clutch Condition “Slipping clutch” in “Clutch System
Symptom Diagnosis in Section 5C”
Low compression “Compression Check in Section 1D”
Camshaft position control (VVT) system
out of order “Oil Control Valve Inspection in Section 1D”
Improper engine idling or
engine fails to idle Faulty spark plug
“Spark Plug Inspection in Section 1H”
Leaky or disconnected high-tension cord “High-Tension Cord Removal and Installation
in Section 1H”
Faulty ignition coil with ignitor “Ignition Coil Assembly (Including ignitor)
Inspection in Section 1H”
Fuel pressure out of specification “Fuel Pressure Check”
Leaky manifold, throttle body, or cylinder
head gasket
Malfunctioning EGR valve “EGR Valve Inspection in Section 1B”
Faulty evaporative emission control
system “EVAP Canister Purge Inspection in Section
1B”
Faulty EGR system “EGR System Inspection in Section 1B”
Faulty fuel injector(s) “Fuel Injector Circuit Check”
Poor performance of ECT sensor or
MAF sensor “ECT Sensor Inspection in Section 1C” or
“MAF and IAT Sensor Inspection in Section
1C”
Faulty electric throttle body assembly “Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty APP sensor assembly “APP Sensor Assembly Inspection in Section
1C”
Faulty ECM
Loose connection or disconnection of
vacuum hoses
Malfunctioning PCV valve “PCV Valve Inspection in Section 1B”
Engine overheating Condition “Engine overheating”
Low compression “Compression Check in Section 1D”
Camshaft position control (VVT) system
out of order “Oil Control Valve Inspection in Section 1D”
Condition Possible cause Correction / Reference Item

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-47
MIL Does Not Come ON with Ignition Switch ON and Engine Stop (but Engine Can Be Started)S7RS0B1104011
Wiring Diagram
Circuit Description
When the ignition switch is turned ON, ECM causes the main relay to turn ON (close the contact point). Then, ECM
being supplied with the main power, transmits indication ON si gnal of MIL to combination meter in order to turn MIL
ON. And then, combination meter turns MIL ON. When the engine starts to run and no malfunction is detected in the
system, ECM transmits MIL indication OFF signal to combination meter in order to turn MIL OFF. And then,
combination meter turns MIL OFF, but if a malfunction was or is detected, MIL remains ON even when the engine is
running.
G281234567
8
910
11
1213141516
1718
19
20
212223242526272829303132
[B]
[A]
E23 C37
34
1819
567
10
11
17
20
47 46
495051
2122
52 16
25 9
24
14
29
5557 54 53
59
60 58 2
262728
15
30
56 4832 31
34353637
4042 39 38
44
45 43 41 331
1213
238
34
1819
567
10
11
17
20
47 46
495051
2122
52 16
25 9
24
14
29
5557 54 53
59
60 58 2
262728
15
30
56 4832 31
34353637
4042 39 38
44
45 43 41 331
12
13
238
BLK/WHT
BLK/RED
BLK/RED
BRN/WHT
BLK/REDWHTBLK/YEL
GRN
12V 5V
2
3
8
6 7
E23-29
E23-3
E23-1
E23-60
E23-18
E23-16
1014
14
12
11
RED/BLK
C37-58
C37-15
C37-30
BLK
E23-31
BLK
BLK/ORNBLK/ORN
4
WHTREDWHTRED
BLK/ORN
G28-16
15
13
14
1414
G28-31
BLK/YEL
BLK/YEL
WHTRED
WHTRED
WHTREDC37-13 C37-12
WHTRED
9
17
5 1 16
I7RS0B110012-02
[A]: ECM connector (viewed from harness side)
6. “METER” fuse13. TCM (A/T model)
[B]: Combination meter connector (viewed from harness side) 7. ECM14. CAN communication line
1. Main fuse box 8. Junction block assembly15. ABS/ESP® control module
2. Ignition switch 9. BCM16. CAN junction connector (ESP® model)
3. Main relay 10. “FI” fuse17. Combination meter
4. Malfunction indicator lamp in combination meter 11. Individual circuit fuse box No.1
5. “IG COIL” fuse 12. “IG ACC” fuse

Downloaded from www.Manualslib.com manuals search engine 1A-48 Engine General Information and Diagnosis:
Troubleshooting
NOTE
When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the special
tool to ECM and/or the ECM connectors referri ng to “Inspection of ECM and Its Circuits”.

Malfunction Indicator Lamp Remains ON after Engine StartsS7RS0B1104012
Wiring Diagram and Circuit Description
Refer to “MIL Does Not Come ON wit h Ignition Switch ON and Engine Stop (but Engine Can Be Started)”.
Step
Action YesNo
1 MIL power supply check
1) Turn ignition switch to ON position.
Do other warning lights come ON? Go to Step 2.
Go to Step 3.
2 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch and check DTC.
Is there DTC(s) P1674, P1676, P1678 and/or P1685? Go to applicable DTC
diag. flow.
Substitute a known-
good combination meter
and recheck. If MIL still
remains OFF, substitute
a known-good ECM and
recheck.
3 CAN communication line circuit check
1) Check CAN communication circuit between combination
meter and ECM, TCM (A/T model) referring to Step 3 of
“DTC P1674: CAN Communication (Bus Off Error)”
Is circuit in good condition? Go to Step 4.
Repair or replace.
4 “METER” fuse check
1) Turn ignition switch to OFF position.
2) Check for fuse blown at “M ETER” fuse in junction block
assembly.
Is “METER” fuse in good condition? Go to Step 5.
Replace “METER” fuse
and check for short.
5 Combination meter power supply check
1) Remove combination meter referring to “Combination
Meter Removal and Installation in Section 9C”.
2) Check for proper connection to combination meter connector at “G28-31” and “G28-16” terminals.
3) If OK, then turn ignition switch to ON position and measure voltage between combination meter connector
at “G28-31” terminal and vehicle body ground.
Is it 10 – 14 V? Go to Step 6.
“RED/BLK” wire is open
circuit.
6 Combination meter circuit check
1) Turn ignition switch to OFF position.
2) Measure resistance between “G28-16” terminal of
combination meter connector and vehicle body ground.
Is resistance 1
Ω or less? Substitute a known-
good combination meter
and recheck. If MIL still
remains OFF, substitute
a known-good ECM and
recheck.
“BLK/ORN” wire is open
or high resistance
circuit.

Downloaded from www.Manualslib.com manuals search engine 1A-50 Engine General Information and Diagnosis:
Circuit Description
Actual valve timing fails to become close to target advance level of each function although advance control function or
retarded advance control function is at work.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure 1) Clear DTC. Refer to “DTC Clearance”.
2) Start engine and keep it at idle for 10 seconds.
3) Check DTC. Refer to “DTC Check”.
DTC Troubleshooting
NOTE
• When measuring circuit voltage, resistance and/ or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors re ferring to “Inspection of ECM and Its Circuits”.
• Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and confirm that the trouble has been corrected.

DTC detecting condition Trouble area
Monitor signal of oil control valve is different from
command signal. (Circuit open or short)
(1 driving cycle detection logic) • Oil control valve
• Oil control valve circuit
•ECM
Step
Action YesNo
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2.
Go to “Engine and
Emission Control
System Check”.
2 Oil control valve electrical circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection at “C37-60” and “C37-59” terminals of ECM connector.
3) If OK, measure resistance between “C37-60” and “C37- 59” terminals of ECM connector.
Is resistance below 10
Ω? Go to Step 3. Go to Step 8.
3 Oil control valve electrical circuit check
Was resistance more than 6.5
Ω in Step 2? Go to Step 4. Go to Step 7.
4 Oil control valve electrical circuit for power short check
1) Turn ON ignition switch.
2) Measure voltage between “C37-60” terminal of ECM
connector and engine ground.
Is voltage below 1 V? Go to Step 5. “RED”, “YEL/RED”,
“YEL” or “YEL/GRN”
wire is shorted to power
supply circuit.
5 Oil control valve electrical circuit for ground short
check
1) Disconnect connector from oil control valve with ignition
switch turned OFF.
2) Measure resistance between “C37-60” terminal of ECM connector and engine ground.
Is resistance infinity? Go to Step 6. “YEL/RED” wire is
shorted to ground
circuit.

Downloaded from www.Manualslib.com manuals search engine Engine General Information and Diagnosis: 1A-55
StepAction YesNo
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2.
Go to “Engine and
Emission Control
System Check”.
2 HO2S-1 heater power circuit check
1) Disconnect connector from HO 2S-1 with ignition switch
turned OFF.
2) Check for proper connection to HO2S-1 at “BLK/WHT” and “BLK/RED” wire terminals.
3) If wire and connection are OK, measure voltage between “BLK/WHT” wire terminal and engine ground
with ignition switch turned ON.
Is voltage over 10 V? Go to Step 3.
“BLK/WHT” wire is open
circuit or shorted to
ground circuit.
3 HO2S-1 heater power circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “BLK/WHT” wire terminal of HO2S-1 connector and “E 23-29” terminal of ECM
connector.
Is resistance below 5
Ω? Go to Step 4. “BLK/WHT” wire is high
resistance circuit.
4 HO2S-1 heater drive circuit check
1) Measure resistance between “C37-46” terminal of ECM
connector and vehicle body ground.
Is resistance infinity? Go to Step 5. “BLK/RED” wire is
shorted to ground
circuit.
5 HO2S-1 heater drive circuit check
1) Turn ON ignition switch.
2) Measure voltage between “C37-46” terminal of ECM
connector and vehicle body ground.
Is voltage 0 V? Go to Step 6. “BLK/RED” wire is
shorted to power circuit.
6 HO2S-1 heater drive circuit check
1) Connect connector to HO2S-1 with ignition switch turned
OFF.
2) Turn ON ignition switch.
3) Measure voltage between “C37-46” terminal of ECM connector and vehicle body ground with connector
disconnected from ECM.
Is voltage over 10 V? Go to Step 7. “BLK/RED” wire is open
circuit.
7 HO2S-1 heater check
1) Disconnect HO2S-1 connector with ignition switch
turned OFF.
2) Check HO2S-1 heater resistance referring to “HO2S-1 and HO2S-2 Heater On-Vehicle Inspection in Section
1C”.
Is resistance within specified value range? Go to Step 8. Replace HO2S-1.
8 HO2S-1 heater power circuit check
1) Connect connector to HO2S-1 with ignition switch turned
OFF.
2) Measure resistance between “E23-29” and “C37-46” terminals of ECM connector.
It resistance below 12
Ω? Substitute a known-
good ECM and recheck.
“BLK/WHT”, “BLK/RED”
and / or “BLK” wire is
high resistance circuit.