Daewoo MATIZ Service Manual page 333

a Freeze Frame conditions (rpm, load, vehicle speed,
DTC P0481 – High Speed Cooling Fan Relay Circuit Fault (without A/C)
Step
Perform an Euro On-Board Diagnostic (EOBD)
System Check.
1
Is the system check complete?
1. Turn the ignition switch to ON with the engine
OFF.
2. Install a scan tool.
2
3. Command the relay ON and OFF.
Does the relay turn ON and OFF when
commanded?
1. Turn the ignition switch to LOCK.
2. Disconnect the engine control module (ECM)
connector.
3. Turn the ignition switch to ON.
3
4. Using a digital voltmeter(DVM), measure the
current in high speed relay control circuit, at
terminal 5 to ground for 2 minutes.
Does the amperage measure less than the specified
value?
1. Turn the ignition switch to LOCK.
2. Disconnect the relay.
3. Using a DVM, measure the resistance between
4
terminals 85 and 5 in the relay control circuit in
the ECM harness connector to ground.
Does the DVM display infinite resistance?
1. Turn the ignition switch to LOCK.
2. Disconnect the relay.
3. Connect a test light between the relay coil
terminals 86 and 85 in the relay harness
connector.
5
4. Turn the Turn the ignition switch to ON.
5. Using the scan tool, command the relay ON and
OFF.
Does the test light turn ON and OFF with each
commanded?
With the test light connected to ground, probe the
ignition feed circuit in the relay harness connector.
6
Does the test light illuminate?
1. Turn the ignition switch to LOCK.
2. Reconnect the relay.
3. Disconnect the ECM connector containing the
relay control circuit.
7
4. Turn the Turn the ignition switch to ON.
5. With a fused jumper wire connected to ground,
probe the relay control circuit at terminal 5 in the
ECM harness connector.
Does the relay operate?
Check the connections at the relay.
8
Is a problem found and corrected?
DAEWOO M-150 BL2
Action
ENGINE CONTROLS 1F – 235
temperature, etc.) that .are noted. This will isolate when
the DTC failed.
Value(s)
–
Go to Step 2
–
Go to Step 3
"Diagnostic
0.75 amps
–
Go to Step 12
–
Go to Step 8
–
Go to Step 7
–
Go to Step 9
–
Go to Step 14
Yes No
Go to
"On-Board
Diagnostic
System Check"
Go to Step 5
Go to
Aids" Go to Step 4
Go to Step 10
Go to Step 6
Go to Step 11
Go to Step 10
Go to Step 12