Roland, here is a trouble tree to help. After reading the posts, first thing is to check the connector @ the ECM, both male and female. Ck continuity on H1 from the knock module to the harness connector @ the ECM, but not by back probing, we want to check the integrity of the harness connectors and eliminate it as a problem, so we want to check it where it connects to the ECM, the bent connector thing. I don't have my FAST wire diagram handy so I am ASS U MING that H1 is the signal return to the FAST ECM.
Use digital multimeter when testing
1) * Connect Tach
* Engine running @ about 1500 RPM
* Trans in Park or Neutral and engine @ operating temp
* Tap engine block in area of Knock sensor and check for
RPM drop
NO RPM DROP RPM DROP
Continue to # 2 So whats the problem?
2) * Engine idling
* Back probe terminal H1 w/a voltmeter to ground and note
voltage
UNDER 6 VOLTS OVER 6 VOLTS
3) * Ignition 'ON' Engine STOPPED Faulty connection
* recheck voltage @ H1 @ ECM or bad ECM
UNDER 6 Volts OVER 6 VOLTS
4) * Ignition 'OFF' Replace ESC module
* Disconnect ECM harness
* Ignition 'ON'
* Recheck Voltage
UNDER 6 VOLTS OVER 6 VOLTS
5) * Disconnect ESC module. Replace ECM
* Check voltage from ESC
connector terminal 'B'
to ground
* Should read battery voltage
OK NOT OK
6) * Check for open or short to ground Repair OPEN in
in H1. If not open to ground, circuit "B"
it is a FAULTY ESC connection
or ESC Module
This is GM generic as I can make it. If you need more exact, lemme know. Like if the knock module for a Syclone is wired different.
Use digital multimeter when testing
1) * Connect Tach
* Engine running @ about 1500 RPM
* Trans in Park or Neutral and engine @ operating temp
* Tap engine block in area of Knock sensor and check for
RPM drop
NO RPM DROP RPM DROP
Continue to # 2 So whats the problem?
2) * Engine idling
* Back probe terminal H1 w/a voltmeter to ground and note
voltage
UNDER 6 VOLTS OVER 6 VOLTS
3) * Ignition 'ON' Engine STOPPED Faulty connection
* recheck voltage @ H1 @ ECM or bad ECM
UNDER 6 Volts OVER 6 VOLTS
4) * Ignition 'OFF' Replace ESC module
* Disconnect ECM harness
* Ignition 'ON'
* Recheck Voltage
UNDER 6 VOLTS OVER 6 VOLTS
5) * Disconnect ESC module. Replace ECM
* Check voltage from ESC
connector terminal 'B'
to ground
* Should read battery voltage
OK NOT OK
6) * Check for open or short to ground Repair OPEN in
in H1. If not open to ground, circuit "B"
it is a FAULTY ESC connection
or ESC Module
This is GM generic as I can make it. If you need more exact, lemme know. Like if the knock module for a Syclone is wired different.