2003 DAEWOO MATIZ check engine light

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–

ENGINE CONTROLS 1F–53
DAEWOO M-150 BL2
Data Link Connector Diagnosis
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
With a test light connected to the ground, probe the
Data Link Connector (DLC) battery feed terminal 16.
Is the test light on?
–
Go to Step 4Go to Step 3
3
Repair an open or short to ground in the DLC battery
feed circuit .
Is the repair complete?
–
Go to Step 4
–
4
With a test light connected to the battery, probe the
Data Link Connector (DLC) ground terminal 4 and 5.
Is the test light on?
–
Go to Step 6Go to Step 5
5Repair an open circuit .
Is the repair complete?–Go to Step 6–
6
1. Turn the ignition OFF.
2. Connect a scan tool to the Data Link Connector
(DLC).
3. Turn the ignition ON.
Does the scan tool power up?
–
Go to Step 8Go to Step 7
7
Check for damages in the terminal of DLC and scan
tool, and repair as needed.
Is the repair complete?
–
Go to Step 8
–
8
Using a scan tool, request engine data of Engine
Control Module (ECM).
Does the scan tool display any data?
–
Go to Step 12Go to Step 9
9
Install the scan tool on another vehicle and check for
proper operation.
Does the scan tool work properly on a different
vehicle.
–
Go to Step 11Go to Step 10
10
The scan tool is malfunctioning.
Refer to the scan tool’s manual for repair.
Is the repair complete?
–
Go to Step 12
–
11
Repair communication circuit between ECM and
DLC.
Is the repair complete?
–
Go to Step 12
–
12
1. Using a scan tool, clear the Diagnostic Trouble
Codes(DTCs).
2. Attempt to start the engine.
Does the engine and continue to run?
–
Go to Step 13Go to Step 1
13
1. Allow the engine to idle until normal operation
temperature reached.
2. Check if any DTCs are set?
Are any DTCs displayed that have not been
diagnosed?
–
Go to applicable
DTC table
System OK

ENGINE CONTROLS 1F–77
DAEWOO M-150 BL2
DTC P0122 – Throttle Position Sensor Low Voltage
StepActionValue(s)YesNo
1
Perform an On-Board Diagnostic (EOBD) System
Check.
Was the check performed?
–
Go to Step 2
Go to
“On-Board
Diagnostic
System Check”
2
1. Install a scan tool to the Data Link Connector
(DLC).
2. Turn the ignition ON.
Is the Throttle Position (TP) sensor voltage below
the specified value?
0.20 VGo to Step 4Go to Step 3
3
1. Turn the ignition ON.
2. Review the Freeze Frame data and note the
parameters.
3. Operate the vehicle within the Freeze Frame
conditions and Conditions for Setting the DTC as
noted.
Is the TP sensor voltage below the specified value?
0.20 VGo to Step 4Go to Step 12
4
1. Turn the ignition OFF.
2. Disconnect the TP sensor connector.
3. Turn the ignition ON.
4. Jump the 5 volt reference circuit terminal B and
the TP signal circuit terminal C at the TP sensor
connector.
Is the TP sensor voltage over the specified value?
4.0 VGo to Step 10Go to Step 5
5
Connect a test light between B+ and the TP sensor
signal circuit terminal C.
Is the TP sensor voltage greater than the specified
value?
4.0 VGo to Step 6Go to Step 8
6
Check the TP sensor 5 volt reference circuit for an
open or short to ground and repair as needed.
Is the repair complete?
–
Go to Step 12Go to Step 7
7
Check the 5 volt reference circuit for a poor
connection at terminal 75 of the Engine Control
Module (ECM) and repair as needed.
Is the repair complete?
–
Go to Step 12Go to Step 11
8
Check the TP sensor signal circuit between terminal
C of the TP sensor and terminal 44 of the ECM for
an open or a short to ground and repair as needed.
Is the repair complete?
–
Go to Step 12Go to Step 9
9
Check the TP sensor signal circuit, terminal 44 of
the ECM for a poor connection and repair as
needed.
Is the repair complete?
–
Go to Step 12Go to Step 11
10Replace the throttle body assembly.
Is the action complete?–Go to Step 12–
11
1. Turn the ignition switch OFF.
2. Replace the ECM.
Is the action complete?
–
Go to Step 12
–

ENGINE CONTROLS 1F–81
DAEWOO M-150 BL2
DTC P0123 – Throttle Position Sensor High Voltage
StepActionValue(s)YesNo
1
Perform an On-Board Diagnostic (EOBD) System
Check.
Was the check performed?
–
Go to Step 2
Go to
“On-Board
Diagnostic
System Check”
2
1. Install a scan tool to the Data Link Connector
(DLC).
2. Turn the ignition ON.
Is the Throttle Position (TP) sensor voltage greater
than the specified value?
1.0 VGo to Step 4Go to Step 3
3
1. Turn the ignition ON.
2. Review the Freeze Frame data and note the
parameters.
3. Operate the vehicle within the Freeze Frame
conditions and Conditions for Setting the DTC as
noted.
Is the TP sensor voltage greater than the specified
value?
3.9 VGo to Step 4Go to Step 12
4
1. Turn the ignition OFF.
2. Disconnect the TP sensor connector.
3. Turn the ignition ON.
Is the TP sensor voltage less than the specified
value?
0.2 VGo to Step 5Go to Step 6
5
Probe the TP sensor ground circuit, terminal A at the
TP sensor connector with a test light connected to
B+.
Does the test light illuminate?
–
Go to Step 7Go to Step 9
6
Check the TP sensor signal circuit for an short to
voltage and repair as needed.
Is the repair complete?
–
Go to Step 12Go to Step 11
7
Check the 5 volt reference circuit for a short to B+
and repair as needed.
Is the repair complete?
–
Go to Step 12Go to Step 8
8
Check the TP sensor electric connector for a poor
connection and repair as needed.
Is the repair complete?
–
Go to Step 12Go to Step 10
9
Check the TP sensor ground circuit for an open and
repair as needed.
Is the repair complete?
–
Go to Step 12Go to Step 11
10Replace the throttle body assembly.
Is the action complete?–Go to Step 12–
11
1. Turn the ignition switch OFF.
2. Replace the Engine Control Module (ECM).
Is the action complete?
–
Go to Step 12
–
12
1. Using the scan tool, clear the Diagnostic Trouble
Codes (DTCs).
2. Start the engine and idle at normal operating
temperature.
3. Operate the vehicle within the Conditions for
setting this DTC as specified in the supporting
text.
Does the scan tool indicate that this diagnostic has
run and passed?
–
Go to Step 13Go to Step 2

1F–108 ENGINE CONTROLS
DAEWOO M-150 BL2
DTC P0171 – Fuel Trim System Too Lean (Cont’d)
StepActionValue(s)YesNo
9
1. Visually/physically inspect the following items for
vacuum leaks:

Intake manifold.

Throttle body.

Injector O-rings.
2. Repair any leaks found as necessary.
Is the repair complete?
–
Go to Step 16Go to Step 16
10
Allow the engine to idle.
Are the Idle Air Control (IAC) counts above the
specified value?
5Go to Step 11Go to Step 12
11
Check the fuel for excessive water, alcohol, or other
contaminants and correct the contaminated fuel
condition if present.
Is the repair complete?
–
Go to Step 16Go to Step 13
12
Check the IAC valve performance. Refer to “DTC
P0506 Idle Speed RPM Lower Than Desired Idle
Speed” or “DTC P0507 Idle Speed RPM Higher
Than Desired Idle Speed” in this section and repair
as necessary.
Is the repair complete?
–
Go to Step 16Go to Step 13
13
1. Connect a fuel pressure gauge to the fuel system.
2. Turn the ignition OFF for at least 10 seconds.
3. Turn the ignition ON, with the engine OFF. The
fuel pump will run for approximately 2–3 seconds.
It may be necessary to cycle the ignition switch
ON more than once to obtain maximum fuel
pressure.
4. Note the fuel pressure with the fuel pump running.
The pressure should be within the specified value.
When the fuel pump stops, the pressure may vary
slightly then hold steady.
Is the fuel pressure steady and does the fuel
pressure hold?
380 KPa
(55 psi)
Go to Step 14
Go to
“Fuel System
Diagnosis”
14
1. Start and idle the engine at normal operating
temperature.
2. The fuel pressure noted in the above step should
drop by the indicated value.
Does the fuel pressure drop by the indicated value?
21–69 KPa
(3–10 psi)
Go to
“Fuel Injector
2alance Test”Go to
“Fuel System
Diagnosis”
15Replace the MAP sensor.
Is the action complete?–Go to Step 16–
16
1. Using the scan tool, clear the Diagnostic Trouble
Codes (DTCs).
2. Start the engine and idle at normal operating
temperature.
3. Operate the vehicle within the Conditions for
setting this DTC as specified in the supporting
text.
Does the scan tool indicate that this diagnostic has
run and passed?
–
Go to Step 17Go to Step 2
17
Check if any additional DTCs are set.
Are any DTCs displayed that have not been
diagnosed?
–
Go to
applicable DTC
table
System OK

ENGINE CONTROLS 1F–11 5
DAEWOO M-150 BL2
DTC P1230 – Fuel Pump Relay Low Voltage
StepActionValue(s)YesNo
1
Perform an Euro On-Board Diagnostic (EOBD)
System Check.
Is the system check complete?
–
Go to Step 2
Go to
“On-Board
Diagnostic
System Check”
2
1. Turn the ignition switch to LOCK for 10 seconds.
2. Turn the Turn the ignition switch to ON.
3. Listen for in-tank fuel pump operation.
Does the fuel pump operate?
2.55 seconds
Go to
“Diagnostic
Aids”
Go to Step 3
3
1. Turn the Turn the ignition switch to ON.
2. Disconnect the fuel pump relay.
3. Connect a test light between the fuel pump relay
connector terminal 85 and ground.
4. Turn the Turn the ignition switch to ON.
Is the test light ON?
–
Go to Step 4Go to Step 10
4
1. Turn the Turn the ignition switch to ON.
2. Disconnect the fuel pump relay.
3. Connect a test light between the fuel pump relay
connector terminal 66 and B+.
4. Turn the Turn the ignition switch to ON.
Is the test light ON?
–
Go to Step 5Go to Step 9
5
1. Turn the ignition switch to LOCK.
2. Connect a test light between the fuel pump relay
connector terminal 30 and ground.
Is the test light ON?
–
Go to Step 6Go to Step 8
6
Check for short to ground in the wire between the
fuel pump relay connector terminal 87 and fuel pump
connector.
Is the problem found?
–
Go to Step 7Go to Step 8
7
1. Repair the wire between the fuel pump relay
connector terminal 87 and fuel pump connector
terminal 3.
2. Install the fuel pump relay.
3. Turn the engine OFF for 10 seconds.
4. Clear any DTCs from ECM.
5. Turn the ignition switch to ON.
Does the fuel pump operate?
2.55 secondsGo to Step 14
–
8
1. Replace the fuel pump relay.
2. Turn the ignition OFF for 10 seconds.
3. Clear any DTCs from ECM.
4. Turn the Turn the ignition switch to ON.
Does the fuel pump operate?
2.55 secondsGo to Step 14Go to Step 9
9
Check for a short to ground wire between the fuel
pump relay connector terminal 66 and the ignition
after key ON 1(IGN 1).
Is the problem found?
–
Go to Step 11Go to Step 10
10
Check for a short to ground wire between the fuel
pump relay connector terminal 85 and the ECM
connector terminal 10.
Is the problem found?
–
Go to Step 12Go to Step 13

1F–122 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F150
DIAGNOSTIC TROUBLE CODE (DTC) – P0261 INJECTOR 1 LOW VOLTAGE
Circuit Description
The engine control module (ECM) has three individual
injector driver circuits, each of which controls an injector.
When a driver circuit is grounded by the ECM, the injec-
tor is activated. The ECM monitors the current in each
driver circuit. The ECM measures a voltage drop
through a fixed resistor and controls it. The voltage on
each driver is monitored to detect a fault. If the voltage is
not what the ECM expects to monitor on the circuit, a
Diagnostic Trouble Code (DTC) is set. This DTC detects
a low voltage and/or an open circuit and high voltage
conditions for low-side drive injector outputs.
Conditions for Setting the DTC

This DTC can be stored in “key-on” status.

The injector voltage does not equal the ignition volt-
age when the injector is commanded OFF, or the in-
jector voltage does not equal 0 volts when the injector
is commanded ON.

The battery voltage is less than 9 volts.

The above conditions are met for 5seconds.
Action Taken when the DTC Sets

The Malfunction Indicator Lamp (MIL) will illuminate.
The ECM will record operating conditions at the time
the diagnostic fails. This information will be stored in
the Freeze Frame and Records buffers.

A history DTC is stored.
Conditions for Clearing the MIL/DTC

The MIL will turn off after 4 consecutive ignition
cycles in which the diagnostic runs without a fault.

A history DTC will clear after 40 consecutive warm up
cycles without a fault.

DTC(s) can be cleared by using the scan tool.
DIAGNOSTIC AIDS
An injector 4river circuit that is open or shorted to volt-
age will causes a DTC P0261 to set. It will also cause a
misfire due to an inoperative injector. A misfire DTC
should also be set indicating which injector is inopera-
tive.
Long-term and short-terms fuel trims that are excessive-
ly high or low are a good indication that an injector is
malfunctioning. Refer to “Fuel Injector 2alance Test” in
this Section to check for malfunctioning injectors.
The injector resistance tested at the ECM connection is
slightly more than it tested directly at the injector
2ecause it includes resistance of the harness wires. The
normal value is about 13.5Ω.

1F–124 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F150
DIAGNOSTIC TROUBLE CODE (DTC) – P0262 INJECTOR 1 HIGH VOLTAGE
Circuit Description
The engine control module (ECM) has three individual
injector driver circuits, each of which controls an injector.
When a driver circuit is grounded by the ECM, the injec-
tor is activated. The ECM monitors the current in each
driver circuit. The ECM measures a voltage drop
through a fixed resistor and controls it. The voltage on
each driver is monitored to detect a fault. If the voltage is
not what the ECM expects to monitor on the circuit, a
Diagnostic Trouble Code (DTC) is set. This DTC detects
a low voltage and/or an open circuit and high voltage
conditions for low-side drive injector outputs.
Conditions for Setting the DTC

This DTC can be stored in “key-on” status.

The injector voltage does not equal the ignition volt-
age when the injector is commanded OFF, or the in-
jector voltage does not equal 0 volts when the injector
is commanded ON.

The battery voltage is more than 16 volts.

The above conditions are met for 5seconds.
Action Taken when the DTC Sets

The Malfunction Indicator Lamp (MIL) will illuminate.
The ECM will record operating conditions at the time
the diagnostic fails. This information will be stored in
the Freeze Frame and Records buffers.

A history DTC is stored.
Conditions for Clearing the MIL/DTC

The MIL will turn off after 4 consecutive ignition
cycles in which the diagnostic runs without a fault.

A history DTC will clear after 40 consecutive warm up
cycles without a fault.

DTC(s) can be cleared by using the scan tool.
DIAGNOSTIC AIDS
An injector 4river circuit that is open or shorted to volt-
age will causes a DTC P0262 to set. It will also cause a
misfire due to an inoperative injector. A misfire DTC
should also be set indicating which injector is inopera-
tive.
Long-term and short-terms fuel trims that are excessive-
ly high or low are a good indication that an injector is
malfunctioning. Refer to “Fuel Injector 2alance Test” in
this Section to check for malfunctioning injectors.
The injector resistance tested at the ECM connection is
slightly more than it tested directly at the injector
2ecause it includes resistance of the harness wires. The
normal value is about 13.5Ω.