Suzuki Liana RH413 Service Manual page 122

1A-71 Engine General Information and Diagnosis:
Step
11 Check PCV valve for performance
1) See "PCV Valve Inspection in Section 1B".
Is it in good condition?
DTC P0300 / P0301 / P0302 / P0303 / P0304: Random Misfire Detected (Misfire Detected at 2 or More
Cylinders) / Cylinder 1 / Cylinder 2 / Cylinder 3 / Cylinder 4 Misfire Detected
Wiring Diagram
System Description
ECM monitors crankshaft revolution speed and engine speed via the crankshaft position sensor and cylinder No. via
the camshaft position sensor. Then it calculates the change in the crankshaft revolution speed and from how many
times such change occurred in every 200 or 1000 engine revolutions, it detects occurrence of misfire.
When ECM detects a misfire (misfire rate per 200 revolutions) which can cause overheat and damage to the three way
catalytic converter, it makes the malfunction indicator lamp (MIL) flash as long as misfire occurs at that rate.
After that, however, when the misfire rate drops, MIL remains ON until it is judged as normal 3 times under the same
driving conditions.
Also, when ECM detects a misfire (misfire rate per 1000 revolutions) which will not cause damage to three way
catalytic converter but can cause exhaust emission to be deteriorated, it makes MIL light according to the 2 driving
cycle detection logic.
Action
2
+B
IG1
BLK/RED
3
4
1. Ignition coil No. 1
2. Ignition coil No. 2
3. CKP sensor
Yes
Substitute a known-
good ECM and recheck.
1
C41-20
GRN/YEL
IG1
BLK/WHT
GRN/WHT C41-19
BLU/YEL C41-9
5
BLU/WHT C41-21
BLU/RED C41-31
5
BLU/GRN C41-8
YEL/BLK C41-23
C41-11
BLU
4. CMP sensor
5. Fuel injector
No
Replace PCV valve.
S3RH0A1104036
ECM
5V
5V
5V
5V
I2RH0B110043-01