1988 Firebird 2.8L 5V reference and no fan
03-22-2016, 10:14 AM
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1988 Firebird 2.8L 5V reference and no fan
Good morning everyone. I am working on a friends 2.8L Firebird. The radiator fan is not activating when the vehicle reaches temperature. Thus I did the following, since this car is actually OLDER than the guy who owns it:
1. Replaced Relay
2. Verified 12V at the fuse panel for the fan
3. Verified the radiator fan motor works with direct 12V attached (a little sluggish, but I did make him buy a new fan motor)
4. Took a voltage reading from the 2-prong connector for the temperature sensor and got 5V
5. With the ignition switched to the "ON" position, reading a 5V signal at the connector, with a known working Relay and 12V at the fuse, I close the loop at the connector and no fan, with the new fan motor too.
6. Verified junction box, no shorts.
I am thinking the ECM/ECU may be shot to hell?
1. Replaced Relay
2. Verified 12V at the fuse panel for the fan
3. Verified the radiator fan motor works with direct 12V attached (a little sluggish, but I did make him buy a new fan motor)
4. Took a voltage reading from the 2-prong connector for the temperature sensor and got 5V
5. With the ignition switched to the "ON" position, reading a 5V signal at the connector, with a known working Relay and 12V at the fuse, I close the loop at the connector and no fan, with the new fan motor too.
6. Verified junction box, no shorts.
I am thinking the ECM/ECU may be shot to hell?
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