2003 DAEWOO MATIZ check engine

1F–274 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F340
DIAGNOSTIC TROUBLE CODE (DTC) – P0656 FUEL LEVEL GAUGE CIRCUIT
FAULT
Circuit Description
The engine control module(ECM) uses the fuel level in-
put from the Fuel Level Sensor to calculate expected va-
por pressures within the fuel system. Vapor pressure
vary as the fuel level changes. Vapor pressure is critical
in determining if the evaporative emission (EVAP) sys-
tem is operating properly. Fuel Level is also used to de-
termine if the Fuel level is too high or too low to be able
to accurately detect EVAP system faults. This Diagnos-
tic Trouble Code(DTC) detects a stuck fuel level sender.
Conditions for Setting the DTC

Fuel Level Sensor voltage is higher than 4.8V.

Fuel Level Sensor circuit high voltage.
Action Taken When the DTC Sets

The Malfunction Indicator Lamp (MIL) will not illumi-
nate.

The ECM will store conditions which were present
when the DTC was set as Failure Records data only.

This information will not be stored in the Freeze
Frame data.Conditions for Clearing the MIL/DTC

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
Inspect harness connectors for backed-out terminal, im-
proper mating, broken locks, improperly formed or dam-
aged terminals, and poor terminal-to-wire connection.
Inspect the wiring harness for damage.
A stuck Fuel Level Sensor may cause the DTC to set. If
DTC P0656 cannot be duplicated, the information in-
cluded in the Freeze Frame data can be useful in deter-
mining vehicle operating conditions when the DTC was
first set.
Resistance check for the Fuel Level Sensor.

Empty = 100 ohms or over.

Half full = about 32.5 ohms.

Full = 10 ohms or less.

ENGINE CONTROLS 1F–275
DAEWOO M-150 BL2
DTC P0656 – Fuel Level Gauge Circuit Fault
StepActionValue(s)YesNo
1
Perform an 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.
2. connect the scan tool to the DLC.
3. Turn the Turn the ignition switch to ON.
Are any Diagnostic Trouble Codes (DTCs)
displayed?
–
Go to Step 3
Try with
another scan
tool
3
Refer to the applicable DTC table. Start with the
DTC with the lowest numerical value and move up.
Is the DTC identified as valid trouble code P0656?
–
Go to Step 4
Go to
applicable DTC
table
4
1. Disconnect the cluster connector
2. Turn the ignition switch to LOCK.
3. Check for an open or short to ground in the wire
between the cluster connector terminal C14 and
ground.
Is the problem found?
–
Go to Step 6Go to Step 5
5
1. Turn the ignition switch to LOCK.
2. Check for short to battery in the wire between the
the cluster connector terminal C14 and ground.
Is the problem found?
–
Go to Step 6Go to Step 7
6
1. Change the between cluster and ECM or repair
the connector terminal as needed.
2. Clear any DTCs from ECM.
3. Perform the diagnostic system check.
Is the repair complete?
–
System OK
–
7
1. Replace the cluster.
2. Clear any DTCs from ECM.
3. Perform the diagnostic system check.
Are any Diagnostic Trouble Codes (DTCs)
displayed?
–
Go to Step 8System OK
8Replace the ECM.
Is the replcement complete?–Go to Step 9–
9
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 10Go to Step 2
10
Check if any additional DTCs are set.
Are any DTCs displayed that that have not been
diagnosed?
–
Go to
applicable DTC
table
System OK

1F–276 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F030
DIAGNOSTIC TROUBLE CODE (DTC) – P1660 MALFUNCTION INDICATOR
LAMP (MIL) HIGH VOLTAGE
Circuit Description
When the ignition switch to ON, the Malfunction Indica-
tor Lamp (MIL) is ON steady.
When the engine cranking, the Malfunction Indicator
Lamp (MIL) is OFF after one flashing time.
If a system have some difficulties, the Malfunction Indi-
cator Lamp (MIL) is ON.
Conditions for Setting the DTC

The Malfunction Indicator Lamp (MIL) wiring harness
high voltage.
Action Taken When The DTCs 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 Failure Records buffers.

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

The MIL will turn off after four 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 Intermittent problem may be caused by a poor con-
nection, rubbed through wire insulation, or wire that is
broken inside the insulation.
Any circuitry, that is suspected as causing the com-
plaint, should be thoroughly checked for the following
conditions.

Backed-out terminals

Improper mating

Broken locks

Improperly formed

Damaged terminals

Poor terminals to wire connection

Physical damage to the wiring harness

ENGINE CONTROLS 1F–277
DAEWOO M-150 BL2
DTC P1660 – Malfunction Indicator Lamp (MIL) High Voltage
StepActionValue(s)YesNo
1
Perform an 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.
2. Disconnect the cluster wiring connector.
3. With the test light, connected to ground, probe
the ignition feed circuit, at terminal A7 in the
harness connector.
Does the resistance within the specified value?
0 ΩGo to Step 3Go to Step 6
3
1. Turn the ignition switch to LOCK.
2. With the test light, connected to ground, probe
the ignition feed circuit, at ECM wiring connector
terminal 68.
Does the test light illuminate?
–
Go to Step 4Go to Step 5
4
1. Turn the ignition switch to LOCK.
2. Replace the cluster.
Is the replacement complete?
–
Go to Step 6
–
5
Repair a short to battery between the ECM wiring
connector terminal 68 and cluster wiring connector
terminal B9.
Is the repair complete?
–
Go to Step 6
–
6
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 7Go to Step 2
7
Check if any additional DTCs are set.
Are any DTCs displayed that that have not been
diagnosed?
–
Go to
applicable DTC
table
System OK

1F–278 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F030
DIAGNOSTIC TROUBLE CODE (DTC) – P1661 MALFUNCTION INDICATOR
L A M P ( M I L ) L O W V O LTA G E
Circuit Description
When the ignition switch to ON, the Malfunction Indica-
tor Lamp (MIL) is ON steady.
When the engine cranking, the Malfunction Indicator
Lamp (MIL) is OFF after one flashing time.
If a system have some difficulties, the Malfunction Indi-
cator Lamp (MIL) is ON.
Conditions for Setting the DTC

The Malfunction Indicator Lamp (MIL) wiring harness
low voltage.
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 Failure Records buffers.

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

The MIL will turn off after four 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 Intermittent problem may be caused by a poor con-
nection, rubbed through wire insulation, or wire that is
broken inside the insulation.
Any circuitry, that is suspected as causing the com-
plaint, should be thoroughly checked for the following
conditions.

Backed-out terminals

Improper mating

Broken locks

Improperly formed

Damaged terminals

Poor terminals to wire connection

Physical damage to the wiring harness

ENGINE CONTROLS 1F–279
DAEWOO M-150 BL2
DTC P1661 – Malfunction Indicator Lamp (MIL) Low Voltage
StepActionValue(s)YesNo
1
Perform an 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.
2. Disconnect the cluster wiring connector.
3. With the test light, connected to ground, probe
the ignition feed circuit, at terminal A7 in the
harness connector.
Does the resistance within the specified value?
–
Go to Step 3Go to Step 6
3
1. Turn the ignition switch to LOCK.
2. With the test light, connected to ground, probe
the ignition feed circuit, at ECM wiring connector
terminal 39.
Does the test light illuminate?
–
Go to Step 4Go to Step 5
4
1. Turn the ignition switch to LOCK.
2. Replace the cluster.
Is the replacement complete?
–
Go to Step 6
–
5
Repair a short to ground or open between the ECM
wiring connector terminal 39 and cluster wiring
connector terminal A7.
Is the repair complete?
–
Go to Step 6
–
6
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 7Go to Step 2
7
Check if any additional DTCs are set.
Are any DTCs displayed that that have not been
diagnosed?
–
Go to
applicable DTC
table
System OK

1F – 280 ENGINE CONTROLS
DAEWOO M-150 BL2
SYMPTOM DIAGNOSIS
IMPORTANT PRELIMINARY CHECKS
Important: Several symptom procedures call for a care-
ful visual/physical inspection. Always perform the visual/
physical test first. Visual inspections may lead tocorrecting a problem without further checks and can
save valuable time.
StepActionValue(s)YesNo
1
Perform the On-Board Diagnostic (EOBD) System
Check.
Are any Diagnostic Trouble Code(s) (DTCs) stored
in the Engine Control Module (ECM) memory?
–Go to
Appropriate
DTC Table
Go to Step 2
2
1. Inspect all of the ECM ground connections.
2. Inspect all of the vacuum hoses for splits, kinks,
and proper connections.
3. Check for air leaks at all of the mounting areas of
the intake manifold sealing surfaces.
4. Inspect the ignition wires for cracking, hardness,
proper routing, and carbon tracking.
5. Inspect the wiring for proper connections,
pinches, and cuts.
Are all checks complete?
–
Go to
Appropriate
Symptom Table
–

ENGINE CONTROLS 1F–281
DAEWOO M-150 BL2
INTERMITTENT
Definition: The problem may or may not illuminate the
Malfunction Indicator Lamp (MIL) or store a Diagnostic
Trouble Code (DTC).
Important: Do not use the Diagnostic Trouble Code
(DTC) tables for intermittent problems. A fault must bepresent in order to locate the problem. If a fault is inter-
mittent, use of Diagnostic Trouble Code tables may re-
sult in the replacement of good parts.
StepActionValue(s)YesNo
1
Were the Important Preliminary Checks performed?
–
Go to Step 2
Go to
“Important
Preliminary
Checks”
2
1. Perform a careful inspection of any suspect
circuits.
2. Inspect for poor mating of the connector halves,
or terminals not fully seated into the connector
body.
3. Inspect for improperly formed or damaged
terminals.
4. Inspect for poor terminal-to-wire connections.
This requires removing the terminal from the
connector body to inspect it.
Are any problems present?
–
Go to Step 3Go to Step 4
3Repair the electrical connections as needed.
Is the repair complete?–System OK–
4
Road test the vehicle with a voltmeter connected to
a suspected circuit or a scan tool connected to the
Data Link Connector (DLC).
Did the voltmeter or the scan tool indicate an
abnormal voltage or scan reading?
–
Go to Step 5Go to Step 6
5
Replace the sensor in the affected circuit, if a
Diagnostic Trouble Code (DTC) was stored for this
circuit (except for the DTCs P0171 and P0172).
Is the repair complete?
–
System OK
–
6Does an intermittent Malfunction Indicator Lamp
(MIL) or DTC occur?–Go to Step 7Go to Step 8
7
1. Check for a faulty relay, Engine Control Module
(ECM) driven solenoid, or switch.
2. Check for improper installation of electrical
devices, such as lights, two-way radios, electric
motors, etc.
3. Inspect the ignition control wires for proper
routing (away from ignition wires, ignition system
components, and the generator).
4. Check for a short-to-ground in the MIL circuit or
the DLC “test” terminal.
5. Inspect the ECM ground connections.
6. Correct or repair the affected circuits as needed.
Is the repair complete?
–
System OK
–
8
1. Check for a loss of DTC memory.
2. Disconnect the throttle position (TP) sensor.
3. Run the engine at idle until the MIL comes on.
4. Turn the ignition OFF.
Is DTC P0122 stored in memory?
–
Go to Step 10Go to Step 9