2003 DAEWOO MATIZ check engine

ENGINE CONTROLS 1F–43
DAEWOO M-150 BL2
Idle Air Control System Check
StepActionValue(s)YesNo
1
Perform an Euro On-Board Diagnostic (EOBD)
system check.
Was the check performed?
–
Go to Step 2
Go to “Euro
On-Board
Diagnostic
System Check”
2
1. Turn the ignition OFF.
2. Remove Idle Air Control (IAC) valve.
3. Inspect the IAC passages for restrictions.
Is the problem found?
–
Go to Step 3Go to Step 4
3Clean the IAC passages.
Is the repair complete?–System OK–
4
Measure the resistance between following terminals
of IAC valve.

Terminal A and B

Terminal C and D
Does the resistance equal to the value specified?
40–80 ΩGo to Step 6Go to Step 5
5Replace the IAC valve.
Is the repair complete?–System OK–
6
1. Disconnect the Engine control Module (ECM)
connector.
2. Check for an open or short in the wires between
following terminals.

Terminal A of IAC valve connector and terminal
70 of ECM connector

Terminal B of IAC valve connector and terminal
71 of ECM connector

Terminal C of IAC valve connector and terminal
42 of ECM connector

Terminal D of IAC valve connector and terminal
72 of ECM connector
Is the problem found?
–
Go to Step 8Go to Step 7
7Repair an open or short circuit as needed.
Is the repair complete?–System OK–
8
Inspect the IAC connector terminals and the ECM
connector terminals.
Is the problem found?
–
Go to Step 9Go to Step 10
9
Repair or replace the throttle body assembly and/or
ECM connector terminals as needed.
Is the repair complete?
–
System OK
–
10Replace the ECM.
Is the repair complete?–System OK–

1F–44 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F080
IGNITION SYSTEM CHECK

ENGINE CONTROLS 1F–45
DAEWOO M-150 BL2
IGNITION SYSTEM CHECK
Circuit Description
The Electronic Ignition (EI) system uses a waste spark
method of spark distribution. In this type of EI system,
the Crankshaft Position (CKP) sensor is mounted to the
oil pump near a slotted wheel that is a part of the crank-
shaft pulley. The CKP sensor sends reference pulses to
the Engine Control Module (ECM). The ECM then trig-gers the EI system ignition coil. Each cylinder is individu-
al with coil per cylinder in sequence.
This leaves the remainder of the high voltage to be used
to fire the spark plug in the cylinder on its compression
stroke. Since the CKP sensor is in a fixed position, tim-
ing adjustments are not possible or needed.
Ignition System Check
Caution: Use only electrically insulated pliers when
handling ignition wires with the engine running to
prevent an electrical shock.
StepActionValue(s)YesNo
1
1. Remove the spark plugs.
2. Inspect for wet spark plugs, cracks, wear,
improper gap, burned electrodes, or heavy
deposits.
3. Replace the spark plugs as needed.
Is the repair complete?
–
System OKGo to Step 2
2
Check for the presence of spark from all of the
ignition wires while cranking the engine.
Is spark present from all of the ignition wires?
–
System OKGo to Step 3
3
1. Measure the resistance of the ignition wires.
2. Replace any ignition wire(s) with a resistance
above the value specified.
3. Check for the presence of spark from all of the
ignition wires.
Is spark present from all of the ignition wires?
30000 ΩSystem OKGo to Step 4
4Is spark present from at least one of the ignition
wires, but not all of the ignition wires?Go to Step 5Go to Step 12
5
1. Turn the ignition OFF.
2. Disconnect the Electronic Ignition (EI) system
ignition coil connector.
3. While cranking the engine, measure the voltage
at the EI system ignition coil connector terminal 1.
Does the voltage fluctuate within the values
specified?
0.2–2.0 VGo to Step 8Go to Step 6
6
Check for an open in the wire from EI system
ignition coil connector terminal 1 to the Engine
Control Module (ECM) connector terminal 66.
Is the problem found?
–
Go to Step 7Go to Step 11
7
1. Repair the wiring as needed.
2. Connect the EI system ignition coil connector.
3. Check for the presence of spark from all of the
ignition wires.
Is spark present from all of the ignition wires?
–
System OK
–
8
While cranking the engine, measure the voltage at
the EI system ignition coil connector terminal 2.
Does the voltage fluctuate within the values
specified?
0.2–2.0 VGo to Step 10Go to Step 9

1F–46 ENGINE CONTROLS
DAEWOO M-150 BL2
Ignition System Check (Cont’d)
StepActionValue(s)YesNo
9
Check for an open in the wire from EI system
ignition coil connector terminal 2 to the Engine
Control Module (ECM) connector terminal 1.
Is the problem found?
–
Go to Step 7Go to Step 11
10
1. Replace the EI system ignition coil.
2. Connect the EI system ignition coil connector.
3. Check for the presence of spark from all of the
ignition wires.
Is spark present from all of the ignition wires?
–
System OK
–
11
1. Replace the ECM.
2. Connect the EI system ignition coil connector.
3. Check for the presence of spark from all of the
ignition wires.
Is spark present from all of the ignition wires?
–
System OK
–
12
1. Turn the ignition OFF.
2. Disconnect the crankshaft position (CKP) sensor
connector.
3. Measure the resistance between the CKP sensor
terminals 1 and 2.
Is the resistance within the value specified?
4. Measure the resistance between following
terminals.

Terminals 1 and 3 of CKP sensor.

Terminals 2 and 3 of CKP sensor.
Is the resistance within the value specified?
400–600 Ω
∞
Go to Step 14Go to Step 13
13Replace the crankshaft position sensor.
Is the repair complete?–System OK–
14
1. Turn the ignition ON.
2. Measure the voltage between the CKP sensor
connector terminals 1 and 3.
Is the voltage within the value specified?
0.95–1.10 VGo to Step 20Go to Step 15
15
Measure the voltage between the CKP sensor
connector terminal 1 and ground.
Is the voltage within the value specified?
0.95–1.10 VGo to Step 18Go to Step 16
16
Check the wire between the CKP sensor connector
terminal 1 and the ECM connector terminal 54 for an
open or short.
Is the problem found?
–
Go to Step 17Go to Step 10
17
Repair the wire between the CKP sensor connector
terminal 1 and the ECM connector terminal 54.
Is the repair complete?
–
System OK
–
18
Check the wire between the CKP sensor connector
terminal 3 and ground for an open or short.
Is the problem found?
–
Go to Step 19Go to Step 11
19
Repair the wire between the CKP sensor connector
terminal 3 and ground.
Is the repair complete?
–
System OK
–
20
1. Turn the ignition ON.
2. Measure the voltage between the CKP sensor
connector terminals 2 and 3.
Is the voltage within the value specified?
0.95–1.10 VGo to Step 24Go to Step 21

ENGINE CONTROLS 1F–47
DAEWOO M-150 BL2
Ignition System Check (Cont’d)
StepActionValue(s)YesNo
21
Measure the voltage between the CKP sensor
connector terminal 2 and ground.
Is the voltage within the value specified?
0.95–1.10 VGo to Step 18Go to Step 22
22
Check the wire between the CKP sensor connector
terminal 2 and the ECM connector terminal 24 for an
open or short.
Is the problem found?
–
Go to Step 23Go to Step 11
23
Repair the wire between the CKP sensor connector
terminal 2 and the ECM connector terminal 24.
Is the repair complete?
–
System OK
–
24
1. Turn the ignition OFF.
2. Connect a test light between the EI system
ignition coil connector terminal 2 and ground.
3. Turn the ignition ON.
Is the test light on?
–
Go to Step 27Go to Step 25
25
Check for an open in the wiring between the EI
system ignition coil connector, terminal 1 and the
main relay connector terminal 87.
Is the problem found?
–
Go to Step 26
Go to “Main
Relay Circuit
Check”
26
Repair the open in the wiring between the EI system
ignition coil connector terminal 1 and the main relay
connector terminal 87.
Is the repair complete?
–
System OK
–
27
Check for a damage in the terminal of the EI system
ignition coil connector and repair as needed.
Is the repair complete?
–
System OK
–

1F–48 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F090
ENGINE COOLING FAN CIRCUIT CHECK
Circuit Description
The engine cooling fan circuit operates the cooling fan.
The cooling fan is controlled by the engine control mod-
ule (ECM) based on input from the coolant temperature
sensor (CTS) and the A/C ON/OFF. The ECM controls
the low speed cooling fan operation by internally ground-
ing the ECM connector terminal 39. This energizes the
low speed cooling fan relay and operates the cooling fan
at low speed. The low speed cooling fan operation is
achieved by the cooling fan resistor causing a drop in
the voltage supplied to the cooling fan. The ECM con-
trols the high speed cooling fan operation by internally
grounding the ECM connector terminal 5. This ener-
gizes the high speed cooling fan relay, bypassing the ra-
diator fan resistor. This results in high speed cooling fan
operation.
Diagnostic Aids

If the owner complained of an overheating problem, it
must be determined if the complaint was due to anactual boil over, or the engine coolant temperature
gauge indicated overheating. If the engine is over-
heating and the cooling fans are on, the cooling sys-
tem should be checked.

If the engine fuse block fuse EF15 become open
(blown) immediately after installation, inspect for a
short to ground in the wiring of the appropriate circuit.
If the fuse become open (blown) when the cooling
fans are to be turned on by the Engine Control Mod-
ule (ECM), suspect a faulty cooling fan motor.

The ECM will turn the cooling fan on at low speed
when the coolant temperature is 93C (199F). The
ECM will turn the cooling fans off when the coolant
temperature is 90C (194F).

The ECM will turn the cooling fans on at high speed
when the coolant temperature is 100C (212F). The
ECM will change the cooling fans from high speed to
low speed when the coolant temperature is 97C
(207F).

ENGINE CONTROLS 1F–49
DAEWOO M-150 BL2
Engine Cooling Fan Circuit Check
StepActionValue(s)YesNo
1
Perform an Euro On-Board Diagnostic (EOBD)
System Check.
Was the check performed?
–
Go to Step 2
Go to “Euro
On-Board
Diagnostic
System Check.
2
1. Check the fuses EF3 and EF10 in engine fuse
block.
2. Replace the fuse(s) as needed.
Is the fuse(s) OK?
–
Go to Step 3
Go to
“Diagnostic
Aids”
3
1. Turn the ignition OFF.
2. Turn the A/C switch OFF. If equipped.
3. Connect a scan tool to the Data Link Connector
(DLC).
4. Start the engine.
5. The main cooling fan should run at low speed
when the coolant temperature reaches 96C
(205F).
Does the cooling fan run at low speed?
–
Go to Step 4Go to Step 8
4
The cooling fans should run at high speed when the
coolant temperature reaches 100C (212F).
Do the cooling fans run at high speed?
–
Go to Step 5Go to Step 19
5
1. Turn the ignition OFF.
2. Start the engine.
3. Turn the A/C switch ON.
Does the cooling fan runs at low speed?
–
Go to Step 7Go to Step 6
6
1. Diagnose the A/C compressor clutch circuit.
2. Repair the A/C compressor clutch circuit as
needed.
Is the repair complete?
–
System OK
–
7
1. Turn the ignition OFF.
2. Start the engine.
3. Turn the A/C switch ON and raise the rpm.
4. The cooling fan should run at high speed when
the high side A/C pressure reaches 2068 kPa
(300 psi).
Do the cooling fans run at high speed?
–
System OK
–
8
1. Turn the ignition OFF.
2. Disconnect the cooling fan connector.
3. Turn the ignition ON.
4. Connect a test light between terminal 1 of cooling
fan connector and ground.
Is the test light on?
–
Go to Step 9Go to Step 12
9
Connect a test light between terminal 2 of cooling
fan connector and battery positive.
Is the test light on?
–
Go to Step 11Go to Step 10
10
Repair open circuit between terminal 2 of cooling fan
connector and ground.
Is the repair complete?
–
System OK
–
11
Check for a damaged terminals in main cooling fan
connector and repair it or replace the main cooling
fan.
Is the repair complete?
–
System OK
–

1F–50 ENGINE CONTROLS
DAEWOO M-150 BL2
Engine Cooling Fan Circuit Check (Cont’d)
StepActionValue(s)YesNo
12
1. Turn the ignition ON.
2. Connect a test light between terminals 86 and 30
of low speed cooling fan relay and ground.
Does the test light on for both case?
–
Go to Step 14Go to Step 13
13
Repair power supply circuit.

Fuse EF15 and terminal 30 of low speed cooling
fan relay.
Is the repair complete?
–
System OKGo to Step 14
14
1. Turn the ignition OFF.
2. Disconnect Engine Control Module (ECM)
connectors.
3. Turn the ignition ON.
4. Connect a jump wire between terminal 5 and
ground.
Does the cooling fan run at low speed?
–
Go to Step 15Go to Step 16
15Replace the ECM.
Is the repair complete?–System OK–
16
1. Turn the ignition OFF.
2. Measure the resistance between following
terminals:

Terminal 85 of low speed cooling fan relay and
terminal 39 of ECM connector.
Are the resistance within the value specified?
0 ΩGo to Step 18Go to Step 17
17Repair open circuit.
Is the repair complete?–System OK–
18Replace the low speed cooling fan relay.
Is the repair complete?–System OK–