check engine light DAEWOO MATIZ 2003 Service Repair Manual

SOHC ENGINE MECANICAL 1B–9
DAEWOO M-150 BL2
DIAGNOSTIC INFORMATION AND PROCEDURE
COMPRESSION PRESSURE CHECK
Tools Required
09915–64510 Compression Pressure Gauge
Check the compression pressure in the following proce-
dures:
1. Warm up the engine to the normal operating tempera-
ture (Cooling temperature : 80–90C (176–194F)).
2. Stop the engine and then remove the high tension
cable and the spark plug.
3. Disconnect the distributor optical sensor connector.
4. Install the compression pressure gauge 09915–64510
(a) in the hole of spark plug.
D12B301A
5. Disengage the clutch in Neutral (to lighten starting
load on engine upon cranking), and depress the ac-
celerator all the way to make the throttle fully open.
6. Crank the engine with the starting motor, and read the
highest pressure on the compression pressure gauge.
The difference of measured value between cylinders
is 98.06kPa (14.22 psi) and less.
On checking, make the connection perfectly airtight
between the hole of spark plug and compression pres-
sure gauge.
Unit Standard Limit



Compression
Pressure
– 400 rpm
kPa(psi)1,225.75
(177.73)
1,176.72–
1,274.78
(170.62–
184.84)
7. After checking, remove the gauge and install the re-
moved parts.
OIL PRESSURE CHECK
Tools Required
09915–77310 Oil Pressure Gauge
Prior to check oil pressure, check the followings:
Check oil level and add if required.
Replace the discolored, deteriorated or diluted oil.
Check any oil leakage and repair the defective parts.
Check the compression pressure in the following proce-
dures:
1. Remove the oil pressure switch (b) from the cylinder
block.
2. Install the oil pressure gauge 09915–77310 (c) to the
mounting place of the oil pressure switch.
D12B302A
3. Start the engine and warm up to the normal operating
temperature.
4. Raise the engine speed up to 2,000rpm and then
read oil pressure.
Item Unit Standard
Oil Pressure – 2000rpmkPa
(psi)245.15–294.18
(35.55–42.66)
5. After checking, wrap the threads of oil pressure
switch with a seal tape and tighten it to the specified
torque 12–16 N
m (106–144 lb-in).
6. Start the engine and check oil pressure switch for oil
leakage.

SOHC ENGINE MECANICAL 1B–11
DAEWOO M-150 BL2
The measured value of valve clearance should meet the
specified value. If not, adjust the valve clearance.
Important: In case of hot engine, warm up the engine
until the electric cooling fan begins to work and stop the
engine to adjust the clearance with 20–30 minutes there
from.
Unit : mm (in.)
Item Specified value

Intake0.15±0.02
(0.0059±0.0008)

Valve
Cold
Exhaust0.32±0.02
(0.0126±0.0008)


Valve
Clearance
Intake0.25±0.02
(0.0098±0.0008)


Hot
Exhaust0.42±0.02
(0.0165±0.0008)
8. When adjusting the valve clearance, loosen the ad-
just nut (k) and then tighten or loosen the adjust rod (l)
properly.
D102B307
IGNITION TIMING CHECK AND
ADJUSTMENT (TYPICAL)
Note: Ignition timing could not be adjusted for Direct
Ignition System (Euro Stage III).
Check and adjust the ignition timing in the following pro-
cedures:
1. Warm up the engine to the normal operating tempera-
ture.
2. Turn off the lamp and audio system and shift the shift
gear lever in Neutral.
D12B3081
3. Connect terminal A and terminal C of ALDL connec-
tor using the wire (m) or connect the scan tool (n) with
ALDL connector.
4. Connect the timing light (o) with No. 1 cylinder high
tension cable and check the specified value for the
ignition timing, flashing notch on the crankshaft
pulley.
Item Specified Value
Ignition timing – 950rpm10 BTDC
Important: In flashing the timing light, if crankshaft
pulley notch (p) is matched with the mark (10) for timing
check, the ignition timing is 10 BTDC.
D102B309

1E–2 ENGINE ELECTRICAL
DAEWOO M-150 BL2
DESCRIPTION AND OPERATION
BATTERY
The battery has three major functions in the electrical
system. First, the battery provides a source of energy
for cranking the engine. Second, the battery acts as a
voltage stabilizer for the electrical system. Finally, the
battery can, for a limited time, provide energy when the
electrical demand exceeds the output of the generator.
The sealed battery is standard on all cars. There are no
vent plugs in the cover. The battery is completely
sealed, except for two small vent holes in the sides.
These vent holes allow the small amount of gas pro-
duced in the battery to escape.
The sealed battery has the following advantages over
conventional batteries:

No water need be added for the life of the battery.

It is protected against overcharge. If too much volt-
age is applied to the battery, it will not accept as much
current as a conventional battery. In a conventional
battery, the excess voltage will still try to charge the
battery, leading to gassing, which causes liquid loss.

It is not as liable to self-discharge as a conventional
battery. This is particularly important when a battery
is left standing for long periods of time.

It has more power available in a lighter and a smaller
case.
RATINGS
A battery has two ratings: (1) A reserve capacity rating
designated at 27C (81F), which is the time a fully
charged battery will provide 25 amperes current flow at
or above 10.5 volts; (2) A cold cranking amp rating de-
termined under testing at -18C (0F), which indicates
the cranking load capacity.
RESERVE CAPACITY
The reserve capacity is the maximum length of time it is
possible to travel at night with the minimum electrical
load and no generator output. Expressed in minutes,
Reserve Capacity (or RC rating) is the time required for
a fully charged battery, at a temperature of 27C (81F)
and being discharged at a current of 25 amperes, to
reach a terminal voltage of 10.5 volts.
COLD CRANKING AMPERAGE
The cold cranking amperage test is expressed at a bat-
tery temperature of -18C (0F). The current rating is
the minimum amperage, which must be maintained by
the battery for 30 seconds at the specified temperature,
while meeting a minimum voltage requirement of
7.2 volts. This rating is a measure of cold cranking ca-
pacity.The battery is not designed to last indefinitely. However,
with proper care, the battery will provide many years of
service.
If the battery tests well, but fails to perform satisfactorily
in service for no apparent reason, the following factors
may point to the cause of the trouble:

Vehicle accessories are left on overnight.

Slow average driving speeds are used for short peri-
ods.

The vehicle’s electrical load is more than the genera-
tor output, particularly with the addition of aftermarket
equipment.

Defects in the charging system, such as electrical
shorts, a slipping generator belt, a faulty generator, or
a faulty voltage regulator.

Battery abuse, including failure to keep the battery
cable terminals clean and tight, or a loose battery
hold-down.

Mechanical problems in the electrical system, such
as shorted or pinched wires.
BUILT-IN HYDROMETER
The sealed battery has a built-in, temperature-compen-
sated hydrometer in the top of the battery. This hydrom-
eter is to be used with the following diagnostic
procedure:
1. When observing the hydrometer, make sure that the
battery has a clean top.
2. Under normal operation, two indications can be ob-
served:

GREEN DOT VISIBLE – Any green appearance is
interpreted as a “green dot,” meaning the battery is
ready for testing.

DARK GREEN DOT IS NOT VISIBLE – If there is
a cranking complaint, the battery should be tested.
The charging and electrical systems should also
be checked at this time.
3. Occasionally, a third condition may appear:

CLEAR OR BRIGHT YELLOW – This means the
fluid level is below the bottom of the hydrometer.
This may have been caused by excessive or pro-
longed charging, a broken case, excessive tipping,
or normal battery wear. Finding a battery in this
condition may indicate high charging by a faulty
charging system. Therefore, the charging and the
electrical systems may need to be checked if a
cranking complaint exists. If the cranking com-
plaint is caused by the battery, replace the battery.

ENGINE ELECTRICAL 1E–3
DAEWOO M-150 BL2
CHARGING PROCEDURE
1. Batteries with the green dot showing do not require
charging unless they have just been discharged, such
as in cranking a vehicle.
2. When charging sealed-terminal batteries out of the
vehicle, install the adapter kit. Make sure all the char-
ger connections are clean and tight. For best results,
batteries should be charged while the electrolyte and
the plates are at room temperature. A battery that is
extremely cold may not accept current for several
hours after starting the charger.
3. Charge the battery until the green dot appears. The
battery should be checked every half-hour while
charging. Tipping or shaking the battery may be nec-
essary to make the green dot appear.
4. After charging, the battery should be load tested. Re-
fer to “Starter Motor” in this section.
CHARGING TIME REQUIRED
The time required to charge a battery will vary depend-
ing upon the following factors:

Size of Battery – A completely discharged large
heavy-duty battery requires more than twice the re-
charging as a completely discharged small passenger
car battery.

Temperature – A longer time will be needed to
charge any battery at -18C (0F) than at 27C
(81F). When a fast charger is connected to a cold
battery, the current accepted by the battery will be
very low at first. The battery will accept a higher cur-
rent rate as the battery warms.

Charger Capacity – A charger which can supply only
5 amperes will require a much longer charging period
than a charger that can supply 30 amperes or more.

State-of-Charge – A completely discharged battery
requires more than twice as much charge as a one-
half charged battery. Because the electrolyte is nearly
pure water and a poor conductor in a completely dis-
charged battery, the current accepted by the battery
is very low at first. Later, as the charging current
causes the electrolyte acid content to increase, the
charging current will likewise increase.
CHARGING A COMPLETELY
DISCHARGED BATTERY
(OFF THE VEHICLE)
Unless this procedure is properly followed, a perfectly
good battery may be needlessly replaced.
The following procedure should be used to recharge a
completely discharged battery:
1. Measure the voltage at the battery terminals with an
accurate voltmeter. If the reading is below 10 volts,
the charge current will be very low, and it could take
some time before the battery accepts the current inexcess of a few milliamperes. Refer to “Charging
Time Required” in this section, which focuses on the
factors affecting both the charging time required and
the rough estimates in the table below. Such low cur-
rent may not be detectable on ammeters available in
the field.
2. Set the battery charger on the high setting.
Important: Some chargers feature polarity protection
circuitry, which prevents charging unless the charger
leads are correctly connected to the battery terminals. A
completely discharged battery may not have enough
voltage to activate this circuitry, even though the leads
are connected properly, making it appear that the bat-
tery will not accept charging current. Therefore, follow
the specific charger manufacturer’s instruction for by-
passing or overriding the circuitry so that the charger will
turn on and charge a low-voltage battery.
3. Battery chargers vary in the amount of voltage and
current provided. The time required for the battery to
accept a measurable charger current at various volt-
ages may be as follows:
VoltageHours
16.0 or moreUp to 4 hours
14.0–15.9Up to 8 hours
13.9 or lessUp to 16 hours

If the charge current is not measurable at the end
of the above charging times, the battery should be
replaced.

If the charge current is measurable during the
charging time, the battery is good, and charging
should be completed in the normal manner.
Important: It is important to remember that a complete-
ly discharged battery must be recharged for a sufficient
number of ampere hours (AH) to restore the battery to a
usable state. As a general rule, using the reserve capac-
ity rating (RC) as the number of ampere hours of charge
usually brings the green dot into view.

If the charge current is still not measurable after
using the charging time calculated by the above
method, the battery should be replaced.

If the charge current is measurable during the
charging time, the battery is good, and charging
should be completed in the normal manner.
JUMP STARTING PROCEDURE
1. Position the vehicle with the good (charged) battery
so that the jumper cables will reach from one battery
to the other.
2. Turn off the ignition, all the lights, and all the electrical
loads in both vehicles. Leave the hazard flasher on if
there may be other traffic and any other lights needed
for the work area.

1E–12 ENGINE ELECTRICAL
DAEWOO M-150 BL2
BATTERY LOAD TEST
1. Check the battery for obvious damage, such as a
cracked or broken case or cover, which could permit
the loss of electrolyte. If obvious damage is noted, re-
place the battery.
Caution: Do not charge the battery if the hydrometer
is clear or light yellow. Instead, replace the battery. If
the battery feels hot or if violent gassing or spewing
of electrolyte through the vent hole occurs, discontin-
ue charging or reduce the charging rate to avoid inju-
ry.
2. Check the hydrometer. If the green dot is visible, go to
the load test procedure. If the indicator is dark but
green is not visible, charge the battery. For charging a
battery removed from the vehicle, refer to “Charging a
Completely Discharged Battery” in this section.
3. Connect a voltmeter and a battery load tester across
the battery terminals.
4. Apply a 300-ampere load for 15 seconds to remove
any surface charge from the battery.
5. Remove the load.
6. Wait 15 seconds to let the battery recover, and apply
a 270-ampere load.
Important: The battery temperature must be estimated
by touch and by the temperature condition the battery
has been exposed to for the preceding few hours.
7. If the voltage does not drop below the minimum
listed, the battery is good and should be reinstalled. If
the voltage is less than the minimum listed, replace
the battery. Refer to “Battery Specifications” in this
section.
GENERATOR OUTPUT TEST
1. Perform the generator system test. Refer to “Gener-
ator System Check” in this section.
2. Replace the generator if it fails that test. Refer to
“Generator” in the On-Vehicle Service section. If it
passes the test, perform the on-vehicle output
check which follows.
Important: Always check the generator for output be-
fore assuming that a grounded “L” terminal circuit has
damaged the regulator.
3. Attach a digital multimeter (a), an ammeter (b), and
a carbon pile load (c) to the battery (d) and the gen-
erator (e) of the rehicle.
D102E301
Important: Be sure the vehicle battery is fully charged,
and the carbon pile load is turned off.
4. With the ignition switch in the OFF position, check
and record the battery voltage.
5. Remove the harness connector from the generator.
6. Turn the ignition switch to the ON position with the
engine not running. Use a digital multimeter to
check for voltage in the harness connector “L” termi-
nal.
7. The reading should be near the specified battery
voltage of 12 volts. If the voltage is too low, check
the indicator “L” terminal circuits for open and
grounded circuits causing voltage loss. Correct any
open wires, terminal connections, etc., as neces-
sary. Refer to “Charging System” in this section.
8. Attach the generator harness connector.
9. Run the engine at a moderate idle, and measure the
voltage across the battery terminals. The reading
should be above that recorded in Step 4 but less
than 15 volts. If the reading is over 15 volts or below
the previous reading, replace the generator. Refer to
“Generator” in the On-Vehicle Service section.
10. Run the engine at a moderate idle, and measure the
generator amperage output.
11. Turn on the carbon pile, and adjust it to obtain the
maximum amps while maintaining the battery volt-
age above 13 volts.
12. If the reading is within 15 amps of the generator’s
rating noted on the generator, the generator is good.
If not, replace the generator. Refer to “Generator”
in the On-Vehicle Service section.
13. With the generator operating at the maximum out-
put, measure the voltage between the generator
housing and the battery negative terminal. The volt-
age drop should be 0.5 volt or less. If the voltage
drop is more than 0.5 volt, check the ground path
from the generator housing to the negative battery
cable.
14. Check, clean, tighten, and recheck all of the ground
connections.

ENGINE ELECTRICAL 1E–13
DAEWOO M-150 BL2
GENERATOR SYSTEM CHECK
When operating normally, the generator indicator lamp
will come on when the ignition switch is in the ON posi-
tion and go out when the engine starts. If the lamp oper-
ates abnormally or if an undercharged or overcharged
battery condition occurs, the following procedure may
be used to diagnose the charging system. Remember
that an undercharged battery is often caused by acces-
sories being left on overnight or by a defective switch
that allows a lamp, such as a trunk or glove box lamp, to
stay on.
Diagnose the generator with the following procedure:
1. Visually check the belt and wiring.
2. With the ignition switch in the ON position and the en-
gine stopped, the charge indicator lamp should be on.
If not, detach the harness at the generator and
ground the ‘‘L’’ terminal in the harness with a fused,
5-ampere jumper lead.
If the lamp lights, replace the generator. Refer to
“Generator” in the On-Vehicle Service section.

If the lamp does not light, locate the open circuit
between the ignition switch and the harness con-
nector. The indicator lamp bulb may be burned out.
3. With the ignition switch in the ON position and the en-
gine running at moderate speed, the charge indicator
lamp should be off. If not, detach the wiring harness
at the generator.

If the lamp goes off, replace the generator. Refer to
“Generator” in the On-Vehicle Service section.

If the lamp stays on, check for a short to ground in
the harness between the connector and the indica-
tor lamp.
Important: Always check the generator for output be-
fore assuming that a grounded ‘‘L’’ terminal circuit has
damaged the regulator. Refer to “Generator” in the Unit
Repair section.

ENGINE CONTROLS 1F–17
DAEWOO M-150 BL2
DIAGNOSTIC INFORMATION AND PROCEDURES
SYSTEM DIAGNOSIS
DIAGNOSTIC AIDS
If an intermittent problem is evident, follow the guide-
lines below.
Preliminary Checks
Before using this section you should have already per-
formed the “Euro On-Board Diagnostic (EOBD) System
Check.”
Perform a thorough visual inspection. This inspection
can often lead to correcting a problem without further
checks and can save valuable time. Inspect for the fol-
lowing conditions:

Engine Control Module (ECM) grounds for being
clean, tight, and in their proper location.

Vacuum hoses for splits, kinks, collapsing and proper
connections as shown on the Vehicle Emission Con-
trol Information label. Inspect thoroughly for any type
of leak or restriction.

Air leaks at the throttle body mounting area and the
intake manifold sealing surfaces.

Ignition wires for cracks, hardness, proper routing,
and carbon tracking.

Wiring for proper connections.

Wiring for pinches or cuts.
Diagnostic Trouble Code Tables
Do not use the Diagnostic Trouble Code (DTC) tables to
try and correct an intermittent fault. The fault must be
present to locate the problem.
Incorrect use of the DTC tables may result in the unnec-
essary replacement of parts.
Faulty Electrical Connections or Wiring
Most intermittent problems are caused by faulty electri-
cal connections or wiring. Perform a careful inspection
of suspect circuits for the following:

Poor mating of the connector halves.

Terminals not fully seated in the connector body.

Improperly formed or damaged terminals. All connec-
tor terminals in a problem circuit should be carefullyinspected, reformed, or replaced to insure contact
tension.

Poor terminal-to-wire connection. This requires re-
moving the terminal from the connector body.
Road Test
If a visual inspection does not find the cause of the prob-
lem, the vehicle can be driven with a voltmeter or a scan
tool connected to a suspected circuit. An abnormal volt-
age or scan tool reading will indicate that the problem is
in that circuit.
If there are no wiring or connector problems found and a
DTC was stored for a circuit having a sensor, except for
DTC P0171 and DTC P0172, replace the sensor.
Intermittent Malfunction Indicator Lamp
(MIL)
An intermittent Malfunction Indicator Lamp(MIL) with no
DTC present may be caused by the following:

Improper installation of electrical options such as
lights, two way radios, sound, or security systems.

MIL driver wire intermittently shorted to ground.
Fuel System
Some intermittent driveability problems can be attrib-
uted to poor fuel quality. If a vehicle is occasionally run-
ning rough, stalling, or otherwise performing badly, ask
the customer about the following fuel buying habits:

Do they always buy from the same source? If so, fuel
quality problems can usually be discounted.

Do they buy their fuel from whichever fuel station that
is advertising the lowest price? If so, check the fuel
tank for signs of debris, water, or other contamina-
tion.
IDLE LEARN PROCEDURE
Whenever the battery cables, the Engine Control Mod-
ule (ECM), or the fuse is disconnected or replaced, the
following idle learn procedure must be performed:
1. Turn the ignition ON for 10 seconds.
2. Turn the ignition OFF for 10 seconds.

1F–26 ENGINE CONTROLS
DAEWOO M-150 BL2
Engine Cranks But Will Not Run (Cont’d)
StepActionValue(s)YesNo
12
Check for an open or short in the wires between
CKP sensor connector and ECM connector and
repair as need.
Is the repair complete?
–
Go to Step 2
–
13
1. Disconnect electronic Ignition (EI) system ignition
coil connector to prevent the vehicle from starting.
2. Measure the voltage at ECM connector terminal
24 and 54 by backprobing the ECM connector.
Are the voltage readings near the value specified?
0.4 V with
ignition ON,
2.0 V during
cranking
Go to Step 15Go to Step 14
14Replace the CKP sensor.
Is the repair complete?–Go to Step 2–
15
1. Turn the ignition OFF.
2. Disconnect the electrical connector at EI system
ignition coil.
3. Connect a test light between terminal 1 of the EI
system ignition coil connector and ground.
4. Turn the ignition ON.
Is the test light on?
–
Go to Step 17Go to Step 16
16
Check for open in wire between the battery and EI
system ignition coil connector terminal 1 and repair
as needed.
Is the repair complete?
–
Go to Step 2
–
17
1. Turn the ignition OFF.
2. Disconnect ECM connector and EI system
ignition coil connector.
3. Measure the resistance between following
terminals:

Terminal 2 of ignition coil and terminal 1 of
ECM connector.

Terminal 3 of ignition coil and terminal 32 of
ECM connector.

Terminal 4 of ignition coil and terminal 31 of
ECM connector.
Are the resistance within the value specified?
0 ΩGo to Step 19Go to Step 18
18Check for open circuit and repair as needed.
Is the repair complete?–Go to Step 2–
19
1. Measure the resistance between following
terminals:

Terminal 1 and 2 of ignition coil.

Terminal 3 and 4 of ignition coil.
Are the resistance within the value specified?
2. Remove the high tension cable.
3. Measure the resistance between second coil.

Between 1 and 4

Between 2 and 3
Are the resistance within the value specified?
0.9Ω
5.3 kΩ
Go to Step 21Go to Step 20
20Replace the EI system ignition coil.
Is the repair complete?–Go to Step 2–

ENGINE CONTROLS 1F–27
DAEWOO M-150 BL2
Engine Cranks But Will Not Run (Cont’d)
StepActionValue(s)YesNo
21
1. Check for any damages or poor connection in
ignition wires and repair as needed.
2. Connect the Ei system ignition coil connector and
ECM connector.
3. Check for the presence of spark from all of the
ignition wires.
Is the spark present from all of the ignition wires?
–
Go to Step 2Go to Step 22
22Replace ECM
Is the repair complete?–Go to Step 2–
23
1. Turn the ignition OFF.
2. Connect a fuel pressure gauge.
3. Crank the engine.
Is any fuel pressure present?
–
Go to Step 26Go to Step 24
24
1. Turn the ignition OFF.
2. Disconnect the electrical connector at the fuel
pump.
3. Connect a test light between the fuel pump
terminals 2 and 3.
4. Turn the ignition ON.
5. With the ignition ON, the test light should light for
the time specified.
Is the test light on?
2 sec.Go to Step 25Go to Step 32
25Replace the fuel pump.
Is the repair complete?–Go to Step 2–
26
Is the fuel pressure within the value specified?
380 kPa
(55 psi)
Go to Step 27Go to Step 29
27Check the fuel for contamination.
Is the fuel contaminated?–Go to Step 28Go to Step 41
28
1. Remove the contaminated fuel from the fuel tank.
2. Clean the fuel tank as needed.
Is the repair complete?
–
Go to Step 2
–
29
1. Check the fuel filter for restriction.
2. Inspect the fuel lines for kinks and restrictions.
3. Repair or replace as needed.
4. Measure the fuel pressure.
Is the fuel pressure within the value specified?
380 kPa
(55 psi)
Go to Step 2Go to Step 30
30
1. Disconnect vacuum line from the fuel pressure
regulator.
2. Inspect the vacuum line for the presence of fuel.
3. Inspect the fuel pressure regulator vacuum port
for the presence of fuel.
Is any fuel present?
–
Go to Step 31Go to Step 32
31Replace the fuel pressure regulator.
Is the repair complete?–Go to Step 2–
32
1. Remove the fuel pump assembly from the fuel
tank.
2. Inspect the fuel pump sender and the fuel
coupling hoses for a restriction.
3. Inspect the in-tank fuel filter for restriction.
Is the problem found?
–
Go to Step 33Go to Step 25

1F–28 ENGINE CONTROLS
DAEWOO M-150 BL2
Engine Cranks But Will Not Run (Cont’d)
StepActionValue(s)YesNo
33
Replace the fuel pump sender, the in-tank fuel filter,
and/or the fuel coupling hoses as needed.
Is the repair complete?
–
Go to Step 2
–
34
1. Turn the ignition OFF.
2. Disconnect the electric connector at the fuel
pump.
3. Connect a test light between fuel pump connector
terminal 3 and ground.
4. Turn the ignition ON.
5. With the ignition ON, the test light should
illuminate for the time specified.
Is the test light on?
2 secGo to Step 35Go to Step 36
35
Repair the open circuit between the fuel pump
connector terminal 2 and ground.
Is the repair complete?
–
Go to Step 2
–
36
1. Turn the ignition OFF.
2. Disconnect the fuel pump relay.
3. Turn the ignition ON.
4. Measure the voltage at terminal 30 and 85 of fuel
pump relay.
Is the voltage within the value specified?
11 – 14 VGo to Step 38Go to Step 37
37Repair open or short circuit for power supply.
Is the repair complete?–Go to Step 2–
38
1. Turn the ignition OFF.
2. Disconnect ECM connector.
3. Using an ohmmeter, measure the resistance
between following terminals.

Terminal 10 of ECM and terminal 85 of fuel
pump relay.

Terminal 87 of fuel pump relay and terminal 3
of fuel pump.
Does the resistance within the value specified?
0 ΩGo to Step 40Go to Step 39
39
1. Check for open circuit and fuel cut–off switch.
2. Reset fuel cut-off switch or repair open circuit as
needed.
Is the repair complete?
–
Go to Step 2
–
40Replace the fuel pump relay.
Is the repair complete?–Go to Step 2–
41
1. Turn the ignition OFF.
2. Disconnect the fuel inject harness connectors
from all of the fuel injectors.
3. Turn the ignition ON.
4. Connect test light between fuel injector harness
connector 1 and ground.
5. Repeat step 4 for each of the remaining fuel
injectors.
Does the test light on at all of the fuel injectors?
–
Go to Step 42Go to Step 45