HELP QUICK PLS, Code 7 on OBD0 b16
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From: Illinois
Re: HELP QUICK PLS, Code 7 on OBD0 b16 (CrX-To-Tha-Max-v2.0)
Code 7 - Throttle Position/Angle Sensor
TPS sensor input is used to determine when the throttle is:
Idle
Wide Open Throttle (WOT)
Rapid Movement
During these conditions the ECU makes changes to the injector Pulse Width (PW).
The PW is widen slightly when the throttle initially goes to idle. Within a few seconds the O2 sensor will correct the mixture.
Closed Throttle Input (under .5V), engine RPM is above 1100, engine is warm. The fuel injectors will be shut-off (used to conserve fuel). Peeps with A/F Ratio Meters will see this happen, when the gauge drops to full lean, or no reading at all.
When Wide Open Throttle is detected the PW is increased above normal fuel delivery. This is also known as "Open Loop" operation, when the ECU ignores the output from the O2 sensor.
With Rapid Throttle Opening the ECU is watching the TPS input voltage for rapid changes. A sudden rise in the voltage would mean the throttle was opened quickly. So the ECU would increase the PW momentarily. As soon as the MAP sensor senses the drop in vacuum, it will take over.
Testing - With the Key On, Engine Off hook up a voltmeter to the TPS. @ idle (closed throttle), voltage should be close to .5V and @ WOT (Wide Open Throttle) voltage should be 4.5V.
The best way to adjust the TPS voltage is @ idle (closed throttle). While Key On, Engine Off, hook up voltmeter between the yel/wht & grn/wht and observe reading. If it needs to be adjusted, loosen the TPS mounting and move the TPS until voltmeter reads close to .5V. The check engine light will let you know immediately whether you missed up or not.
TPS Sensor Wires:
1 Red/Blue
1 Green/White
1 Yellow/White
TPS sensor input is used to determine when the throttle is:
Idle
Wide Open Throttle (WOT)
Rapid Movement
During these conditions the ECU makes changes to the injector Pulse Width (PW).
The PW is widen slightly when the throttle initially goes to idle. Within a few seconds the O2 sensor will correct the mixture.
Closed Throttle Input (under .5V), engine RPM is above 1100, engine is warm. The fuel injectors will be shut-off (used to conserve fuel). Peeps with A/F Ratio Meters will see this happen, when the gauge drops to full lean, or no reading at all.
When Wide Open Throttle is detected the PW is increased above normal fuel delivery. This is also known as "Open Loop" operation, when the ECU ignores the output from the O2 sensor.
With Rapid Throttle Opening the ECU is watching the TPS input voltage for rapid changes. A sudden rise in the voltage would mean the throttle was opened quickly. So the ECU would increase the PW momentarily. As soon as the MAP sensor senses the drop in vacuum, it will take over.
Testing - With the Key On, Engine Off hook up a voltmeter to the TPS. @ idle (closed throttle), voltage should be close to .5V and @ WOT (Wide Open Throttle) voltage should be 4.5V.
The best way to adjust the TPS voltage is @ idle (closed throttle). While Key On, Engine Off, hook up voltmeter between the yel/wht & grn/wht and observe reading. If it needs to be adjusted, loosen the TPS mounting and move the TPS until voltmeter reads close to .5V. The check engine light will let you know immediately whether you missed up or not.
TPS Sensor Wires:
1 Red/Blue
1 Green/White
1 Yellow/White
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gringo7718
Honda CRX / EF Civic (1988 - 1991)
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Nov 25, 2015 10:03 PM
