Legacy Sedan 2WD F4-2.2L SOHC (1990)
Knock Sensor Testing
CHECK ECU VOLTAGE
With ignition "ON," measure voltage between ECU connector terminal (B56)5 and ground. It should read 3-4V.
CHECK KNOCK SENSOR
With knock sensor disconnected, measure resistance between sensor terminals and ground. It should read approximately 560K Ohms.
CHECK HARNESS BETWEEN ECU AND KNOCK SENSOR
1.
Disconnect ECU and knock sensor connectors.
2.
Measure resistance between ECU and knock sensor connectors and ground as follows:
Connector & terminal:
Resistance:
(B56)5-(B19)1
0 Ohms
(B19)1-Ground
1M Ohms min.