Daewoo Nubira Owner's Manual page 158

1F – 34IENGINE CONTROLS
Step
1 Perform an On–Board Diagnostic (OBD II) System
Check.
Is the system check complete?
2
1. Ignition OFF, disconnect the powertrain control
module (PCM)/engine control module (ECM).
2. Ignition ON, check the 5 volt reference circuit
for the following conditions:
S Poor connection at the PCM/ECM.
S Open between the PCM/ECM connector
affected sensors shorted to ground or volt-
age.
3. If a problem is found, locate and repair the
open or short circuit as necessary.
Is a problem found?
3
1. Check the sensor ground circuit for the follow-
ing conditions:
S Poor connection at the PCM/ECM or af-
fected sensors.
S Open between the PCM/ECM connector
and the affected sensors.
2. If a problem is found, repair it as necessary.
Is a problem found?
4 Measure the voltage between the Exhaust Gas Re-
circulation (EGR) Pintle Position Sensor signal cir-
cuit at the PCM/ECM harness connector and
ground.
Does the voltage measure near the specified value?
5 Measure the voltage between the Manifold Absolute
Pressure (MAP) sensor signal circuit and the PCM/
ECM harness connector and ground.
Does the voltage measure near the specified value?
6 Measure the voltage between the Throttle Position
(TP) sensor signal circuit and the PCM/ECM har-
ness connector and ground.
Does the voltage measure near the specified value?
7 Measure the voltage between the Intake Air Temper-
ature (IAT) sensor signal circuit and the PCM/ECM
harness connector and ground.
Does the voltage measure near the specified value?
8 Measure the voltage between the Engine Coolant
Temperature (ECT) sensor signal circuit and the
PCM/ECM harness connector and ground.
Does the voltage measure near the specified value?
9
1. Disconnect the EGR valve.
2. Measure the voltage between the EGR Pintle
Position sensor signal circuit and the PCM/
ECM harness connector and ground.
Does the voltage measure near the specified value?
Multiple PCM/ECM Information Sensor DTCs Set
Action Value(s) Yes
Go to Step 2
Go to Step 21
Go to Step 21
0 v Go to Step 5
0 v Go to Step 6
0 v Go to Step 7
0 v Go to Step 8
0 v Go to Step 10
0 v Go to Step 11
No
Go to "On–
Board Diagnos-
tic System
Check"
Go to Step 3
Go to Step 4
Go to Step 9
Go to Step 12
Go to Step 13
Go to Step 14
Go to Step 15
Go to Step 16
DAEWOO V–121 BL4