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1991 Pontiac Grand Prix, IC Circuit Waveform
This is what EST and Bypass voltage should look like at start up. This is with a new module installed to fix a hard code 42. During cranking the module is holding EST low which is why at the beginning of the pattern it's only a 500mv square wave. When the RPM ...
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| Engine | 3.1 L / 6 cyl / GAS |
| Trans | 4-speed AutomaticTransaxle |
| Delivery | Fuel Injection |
| Subsystem | ECM/Inputs/Outputs |
| Component | |
| Condition | Known Good |
References
Vehicle Data
1991 Pontiac Grand Prix SE 3.1L
| Engine | 3.1 L / 6 cyl / GAS |
| Trans | 4-speed AutomaticTransaxle |
| Delivery | Fuel Injection |
| Subsystem | ECM/Inputs/Outputs |
| Component | |
| Condition | Known Good |