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GM Pontiac APV exception Troubleshooting

And then back to the maintenance worker position for maintenance and refueling poor idle instability failure. Surprisingly, the car stopped at the station minutes after the car stalled and could not beat. Mechanic not familiar with this vehicle, check for a long time did not detect fault lies. So,[link widoczny dla zalogowanych], please help me check. The next car, the first carried out by conventional fuel, electricity, gas check, oil, gas no problem, oil pressure normal, no gas leakage between. Checking circuit, found no high-voltage, no fault injection and the dashboard lights. So the first retrieval of fault codes. Fault code 26 idle contacts one by one throttle position sensor short circuit or computer control loop Ground poor; 3l number one (1) bad camshaft position sensor; (2) bad fuel injector; (3) P / N switch bad; (4) negative air pressure sensor. Check each item with fault codes and found no suspicious circumstances. Cylinder engine is a direct result of the ignition type, the ignition module in place under the seat of three of the ignition coil. Check the ignition coil found one shell has broken, remove the ignition coil and ignition module, ignition module plug wire visible interface has cracks. The survey, did not break pinouts. Known by the engine control theory, the engine camshaft position sensor (CKP), crankshaft position sensor (CMP) of the input signal are first ignition module, ignition module and the output from the ignition and fuel injection command to the ignition coils and injectors. After measurement, the key-on ignition module when absolutely no input voltage, and thus no voltage input CKP and the CMP, which is why? Serious access circuit only to find that, after the ignition switch to the ignition module and oil pump relay on the way to go through a 20-fuse, so near to find the fuse in the engine, and finally find the back of the right front headlight fuse. Open the cover and found that the insurance has been blown, the replacement of a new insurance,[link widoczny dla zalogowanych], start the motor, the engine seems to have a car signs, and heavy oil odor oral hygiene and the exhaust pipe and concluded that the phenomenon of a submerged cylinder. Then replace 6 spark plugs, when the engine is very easy to start. However, due to low and jitter powerful engine idling, turn off, this insurance and are burned. So two down the connection to car insurance, check the line, where a thick line along the bottom of the tank pink left front fender inside of the upper left corner from the firewall into the cab, look carefully along the way there are no short-circuit of the Department; and down along the other a line search. The line is divided into four in the top generator ● text / Ren Jingyu stalled when the insurance that 20A will still burn. This insurance not only control the oil pressure switch, but also to control the coils 2,4,6-cylinder line three-cylinder nozzle, the nozzle line will also have the problem? Then measure all the nozzle lines, found that six nozzles were within normal limits l3. 8-14.0 less. In addition to the nozzle cylinder 5, the other jet lines are normal. 5 computer-controlled cylinder nozzle Ground circuit breaker, along this line to find, finally leading to a beam PCM computer bus interface wiring harness plug found broken in! Welding good this line, start the engine, not running A few minutes that the insurance has been burned. A subsidiary of the engine checked almost all lines, and this is why? Are hesitant to hold back the occasion, and heard standing next to a mechanic pointed to a throttle position sensor is located (TPS) directly above the red line and then the battery negative said: \and found that it is a single insertion lines, including three leading to 2,4,6-cylinder injector, the other a box at the top of the oil leading to oil pressure switch. By measuring the A, B foot resistance is 0.7Q, when there is external pressure, A, B foot resistance is infinite, the dashboard oil table pointer at the maximum pressure 830kPa. Increase in engine speed, oil pressure, the pointer points to the value of greater than 830kPa side, clearly prove that the oil pressure switch damaged. After replacing the switch, oil table indicates normal, but in the engine head, and the approximate straight-to-ground, in the key-on when no voltage, so take it for granted that it is a mistaken ground to Shun Shouqiang its anode connected to the battery on. Looking down along this line and found that it leads to the pump relay (FP) on. Know it is a combination of a circuit pump test connector, usually do not have to take. Removed from the battery negative terminal on the line, start the engine, found that the insurance will no longer be burned. Symptoms according to the actual vehicle, a mechanic replace the ignition module and a throttle position sensor,[link widoczny dla zalogowanych], and clean the throttle body, the idle speed instability symptoms have disappeared, more fuel is also smooth, and finally eliminate the fault code,[link widoczny dla zalogowanych], make sure to pay after troubleshooting car.
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