Normal waveforms of the main sensors
The following figures show the normal output waveforms of the main sensors. The data is given when the engine speed is rapidly increasing (overclocking) up to 4800 rpm with no load on the engine and the engine is warm enough. The data in each figure is for reference only, the actual data may differ significantly from them.
1. Camshaft position sensor signal (SMR) and crankshaft position sensor (TFR).
The frequency of the signal should increase gradually when the accelerator pedal is depressed and should gradually decrease after the pedal is released without any sudden dips or jumps.
Engines 2.0 l / 2.4 l. | Engine 2.7 l. |
2. Mass air flow sensor signal (MAF, 2.7L engine only) and throttle position sensor (TPS).
- A) The air flow sensor signal should increase when the accelerator pedal is depressed and should decrease when the throttle is fully closed (with the accelerator pedal released).
- b) The throttle position sensor signal should increase when the accelerator pedal is depressed and should decrease when the pedal is released.
Engines 2.0 l / 2.4 l. | Engine 2.7 l. |
3. Front signal (FR) and rear (RR) oxygen sensors.
The front and rear oxygen sensor signals may increase immediately after the accelerator pedal is depressed and may decrease when the pedal is released.
Engines 2.0 l / 2.4 l. | 2.7L engine (models without EOBD). |
4. Injector control signal.
The signal should increase when the accelerator pedal is depressed and should decrease when the pedal is released.
Engines 2.0 l / 2.4 l. | 2.7L engine |