ECT sensor SUZUKI GRAND VITARA 2001 2.G Owners Manual

6E2-40 ENGINE AND EMISSION CONTROL SYSTEM (SEQUENTIAL MULTIPORT FUEL INJECTION FOR H27 ENGINE)
INSPECTION
1) Check sensor O-ring (1) for damage and deterioration.
Replace as necessary.
2) Arrange 3 new 1.5 V batteries (2) in series and connect its
positive terminal to “Vin” terminal of MAP sensor (1) and
negative terminal to “Ground” terminal. Then check voltage
between “Vout” and “Ground”.
Also, check if voltage reduces when vacuum is slowly
applied up to 400 mmHg by using vacuum pump (3).
If check result is not satisfactory, replace manifold absolute
pressure sensor.
MAP sensor output voltage (Vin voltage 4.5 – 5.5 V, ambi-
ent temp. 20 – 30°C (68 – 86°F))
CAUTION:
As connection to wrong terminal will cause damage to
manifold absolute pressure sensor, make absolutely sure
to connect properly as shown in the figure.
ALTITUDE
(Reference)BAROMETRIC
PRESSUREOUTPUT
VOLTAGE
(ft) (m) (mmHg) (kPa) (V)
0
–
20000
–
610760
–
707100 – 94 3.3 – 4.3
2001
–
5000611
–
1524Under 707
over 63494 – 85 3.0 – 4.1
5001
–
80001525
–
2438Under 634
over 56785 – 76 2.7 – 3.7
8001
–
100002439
–
3048Under 567
over 52676 – 70 2.5 – 3.3

ENGINE AND EMISSION CONTROL SYSTEM (SEQUENTIAL MULTIPORT FUEL INJECTION FOR H27 ENGINE) 6E2-41
INSTALLATION
1) Confirm that vacuum passage on intake manifold is free from
clog.
2) Apply engine oil to O-ring of sensor.
3) Install sensor (1) to intake manifold (2).
4) Connect connector to sensor (1) securely.
Fuel level sensor (sender gauge)
Refer to Section 8C.
Crankshaft position sensor
REMOVAL AND INSTALLATION
Refer to Section 6A4.
INSPECTION
Refer to Section 6-1.
Main relay
INSPECTION
1) Disconnect negative (–) cable at battery.
2) Remove main relay (1) from its connector.
2. Fuel pump relay
3. Fuse box
4. Instrument panel
[A]: Left-hand steering vehicle
[B]: Right-hand steering vehicle

6E2-48 ENGINE AND EMISSION CONTROL SYSTEM (SEQUENTIAL MULTIPORT FUEL INJECTION FOR H27 ENGINE)
PCV system
PCV HOSE
Check hoses for connection, leakage, clog, and deterioration.
Replace as necessary.
Tightening Torque Specification
Special Tool
NOTE:
Be sure to check that there is no obstruction in PCV
valve or its hoses (6) before checking engine idle speed/
IAC duty for obstructed PCV valve or hose hampers its
accurate checking.
1. EVAP canister purge valve 4. EGR pipe
2. EVAP canister purge valve hose 5. EGR valve
3. Breather hose 6. PCV hose
Fastening partTightening torque
Nm kg-m lb-ft
Heated oxygen sensor 45 4.5 32.5
Fuel pressure regulator bolts 10 1.0 7.5
Fuel pipe union bolts 30 3.0 22.0
Engine coolant temp. sensor 15 1.5 11.0
09912-58441 09912-58431 09912-58490 09912-58421
Pressure gauge Pressure hose 3-way joint & hose Checking tool set
(See NOTE “A”.)

IGNITION SYSTEM (FOR H27 ENGINE) 6F2-1
6F2
SECTION 6F2
IGNITION SYSTEM (FOR H27 ENGINE)
CONTENTS
General Description ...................................... 6F2-2
Components ................................................ 6F2-2
System Wiring ............................................. 6F2-3
Diagnosis ....................................................... 6F2-4
Diagnostic Flow Table ................................. 6F2-4
Ignition Spark Check ................................... 6F2-6
Ignition Timing Check and Adjustment........ 6F2-6On-Vehicle Service ....................................... 6F2-8
Ignition Coil Assembly (Igniter and Ignition
Coil)............................................................. 6F2-8
Spark Plug .................................................. 6F2-8
CMP Sensor.............................................. 6F2-10
Noise Suppressor ..................................... 6F2-12
Special Tool ................................................. 6F2-13

WARNING:
For vehicles equipped with Supplemental Restraint (Air Bag) System:
Service on and around the air bag system components or wiring must be performed only by an
authorized SUZUKI dealer. Refer to “Air Bag System Components and Wiring Location View” under
“General Description” in air bag system section in order to confirm whether you are performing ser-
vice on or near the air bag system components or wiring. Please observe all WARNINGS and “Ser-
vice Precautions” under “On-Vehicle Service” in air bag system section before performing service
on or around the air bag system components or wiring. Failure to follow WARNINGS could result in
unintentional activation of the system or could render the system inoperative. Either of these two
conditions may result in severe injury.
Technical service work must be started at least 90 seconds after the ignition switch is turned to the
“LOCK” position and the negative cable is disconnected from the battery. Otherwise, the system
may be activated by reserve energy in the Sensing and Diagnostic Module (SDM).

6F2-2 IGNITION SYSTEM (FOR H27 ENGINE)
General Description
The ignition system is a direct ignition system. It consists of the parts as described below and has an electronic
ignition control system.
•ECM (or PCM)
It detects the engine condition through the signals from the sensors, determines the most suitable ignition
timing and time for electricity to flow to the primary coil and sends a signal to the igniter (in ignition coil
assembly).
•Ignition coil assembly (including an igniter and an ignition coil)
The ignition coil assembly has a built-in igniter and ignition coil which turns ON and OFF the primary current
of the ignition coil according to the signal from ECM (or PCM). When the ignition coil primary current is
turned OFF, a high voltage is induced in the secondary wiring. One ignition coil is in charge of ignition of one
cylinder only.
•Spark plug and noise suppressor
•CMP sensor, TP sensor, ECT sensor, IAT sensor, VSS, knock sensor and MAF sensor
For their details, refer to Section 6E2.
This ignition system does not have a distributor and high-tension cords but each cylinder has an ignition coil
assembly (igniter and ignition coil) and the secondary voltage which occurred in the ignition coil is sent to the
spark plug directly. Also, the signal(s) are sent from the CMP sensor to ECM (or PCM) so as to control each igni-
tion coil independently through the igniter (in ignition coil assembly).
Components
NOTE:
For other components not found in this figure, refer to Section 6E2.
1. Ignition coil assembly (igniter and ignition coil)
2. CMP sensor
3. Noise suppressor
4. ECM (or PCM)
5. Spark plug

IGNITION SYSTEM (FOR H27 ENGINE) 6F2-3
System Wiring
NOTE:
For ECM (PCM) terminal assignment, refer to Section 6E2.
1. To ignition switch 8. Ignition coil assembly (For No.3 cylinder)
2.“IG COIL METER” fuse 9. Ignition coil assembly (For No.4 cylinder)
3. ECM (or PCM) 10. Spark plug
4. CMP sensor 11. Ignition coil assembly (For No.5 cylinder)
5. Noise suppressor 12. Ignition coil assembly (For No.6 cylinder)
6. Ignition coil assembly (For No.1 cylinder) 13. To main relay
7. Ignition coil assembly (For No.2 cylinder) 14. Sensed information

6F2-4 IGNITION SYSTEM (FOR H27 ENGINE)
Diagnosis
Diagnostic Flow Table
Condition Possible Cause Correction
Engine cranks, but will
not start or hard to
start (No spark)Blown fuse for ignition coil assembly Replace.
Loose connection or disconnection of lead wire Connect securely.
Faulty spark plug (s) Replace.
Faulty ignition coil assembly (s) Replace.
Faulty CMP sensor Replace.
Faulty ECM (or PCM) Replace.
Maladjusted ignition timing Adjust.
Poor fuel economy or
engine performanceIncorrect ignition timing Adjust.
Faulty spark plug(s) Replace.
Faulty ignition coil assembly (s) Replace.
Faulty CMP sensor Replace.
Faulty ECM (or PCM) Replace.
Faulty knock sensor Replace.
Step Action Yes No
1Was “ENGINE DIAGNOSTIC FLOW TABLE” in
Section 6-1 performed?Go to Step 2. Go to “ENGINE DIAG-
NOSTIC FLOW TABLE” in
Section 6-1.
2 Ignition Spark Test
1) Check all spark plug for condition and type,
referring to “SPARK PLUG” in this section.
2) If OK, perform ignition spark test, referring
to “IGNITION SPARK CHECK” in this sec-
tion.
Is spark emitted from all spark plugs?Go to Step 8. Go to Step 3.
3 Diagnostic Trouble Code (DTC) Check
1) Check DTC stored in ECM (or PCM), refer-
ring to “DIAGNOSTIC TROUBLE CODE
(DTC) CHECK” in Section 6E2.
Is DTC stored?Go to applicable flow table
corresponding to that
code No. in Section 6E2.Go to Step 4.
4 Electrical Connection Check
1) Check ignition coil assemblies for electrical
connection.
Are they connected securely?Go to Step 5. Connect securely.
5 Ignition Coil Assembly Power Supply, Ground
and Trigger Signal Circuits Check
1) Check these circuits for open and short.
Are circuits in good condition?Go to Step 6. Repair or replace.
6 Ignition Coil Assembly Check
1) Substitute a known-good ignition coil
assembly and then repeat Step 2.
Is check result of Step 2 satisfactory?Malfunction of ignition coil
assembly.Go to Step 7.

IGNITION SYSTEM (FOR H27 ENGINE) 6F2-5
REFERENCE
Oscilloscope waveforms of CMP sensor REF signal and No.1
ignition trigger signal are as shown in figure when connecting
oscilloscope between terminal C51-1-13 of ECM (PCM) connec-
tor connected to ECM (PCM) and ground, and between terminal
C51-2-28 and ground. 7 CMP Sensor Check
1) Check CMP sensor.
Refer to Step 6 or 7 of “DTC P0340 DIAG.
FLOW TABLE” in Section 6-1.
Is check result satisfactory?Substitute a known-good
ECM (or PCM) and then
repeat Step 2.Tighten CMP sensor bolt
or replace CMP sensor.
8 Ignition Timing Check
1) Check initial ignition timing and ignition tim-
ing advance, referring to “IGNITION TIM-
ING CHECK AND ADJUSTMENT” in this
section.
Is check result satisfactory?System is in good condi-
tion.Adjust ignition timing or
check ECM (PCM) input
signals related to this sys-
tem. Step Action Yes No
1. REF signal of CMP sensor
2. No.1 ignition trigger signal
3. Primary coil current flow time

6F2-10 IGNITION SYSTEM (FOR H27 ENGINE)
CMP Sensor
REMOVAL
1) Disconnect CMP sensor coupler (2).
2) Remove A/T fluid level gauge and filler tube.
3) Remove CMP sensor (1) by removing bolt (3).
INSTALLATION
1) Install a new O-ring (2) with engine oil applied to CMP sen-
sor (1). CAUTION:
Disassembly is prohibited. If anything faulty is found,
replace as an assembly unit.
2
3
1
NOTE:
After installing CMP sensor, adjust ignition timing. (Refer
to “IGNITION TIMING CHECK AND ADJUSTMENT” in this
section).

IGNITION SYSTEM (FOR H27 ENGINE) 6F2-11
2) Install CMP sensor to camshaft.
Fit the dog of CMP sensor coupling into the slots of cam-
shaft, when installing. The dogs of CMP sensor coupling are
offset. Therefore, if the dogs can not be fitted into the slots,
turn the CMP sensor shaft by 180 degree and try again.
3) Tighten CMP sensor bolt (3).
Tightening torque
CMP sensor bolt (a) : 15 N·m (1.5 kg-m, 11.0 lb-ft)
4) Connect CMP sensor coupler (2) to CMP sensor (1).
5) Install A/T fluid level gauge and filler tube.
Tightening torque
A/T filler tube bolt (a) : 85 N·m (8.5 kg-m, 61.5 lb-ft)
1. CMP sensor
2. CMP sensor coupling
3. Camshaft
A : Slot offset
12
2
3, (a)
1
(a)