99 nissan sentra

Description: A 1999 Nissan Sentra 1.6 recently had a new motor installed, but there is no power reaching the ignition coil. All sensors have been replaced with the original components. Ignition power is present, and there is power to the crank sensor. It appears there may be an open circuit between the ignition switch and the coil. The coil should receive power when the key is turned on, regardless of sensor inputs. It is advisable to inspect the wiring circuit and connectors from the ignition switch to the condenser and then to the coil, as indicated in the wiring schematic. If the sensors are not properly connected, this could lead to power loss. Ignition power is available to all other components, including fuses, suggesting that the issue is unlikely to be related to the computer or vacuum systems. A shop visit indicated a potential loose wire, but the technician was unable to locate it. A troubleshooting method involves connecting a jumper wire from the battery positive terminal directly to the coil positive terminal. If this results in a spark and the engine starts, it confirms that a faulty wire is the issue. The wiring diagram should be used to trace the connections, checking continuity with an ohmmeter (with the key off) or measuring voltage with a voltmeter (with the key on) from the coil positive back to the ignition switch. All connectors should be unplugged and checked until the point of power loss is identified, at which point the faulty wire or connector should be replaced.

The ignition system in the 1999 Nissan Sentra 1.6 is critical for proper engine operation. The ignition coil is responsible for transforming the battery's low voltage into the high voltage required to create a spark at the spark plugs. The power flow begins at the ignition switch, which should provide a stable voltage when the key is in the "on" position. The wiring circuit from the ignition switch to the coil must be intact, with no breaks or shorts, to ensure that the coil receives the necessary voltage.

In troubleshooting, it is essential to follow a systematic approach. First, confirm that the ignition switch is functioning correctly and providing power. Next, visually inspect the wiring harness for any signs of damage, such as fraying or corrosion, particularly at connection points. The connectors should be securely attached, and any loose connections must be remedied.

Utilizing a multimeter, continuity tests can be conducted to verify that the wiring is intact. If a break is found, the specific section of the wire should be replaced. In addition to continuity, voltage testing can help identify where the power is lost in the circuit. This testing should be performed with the ignition key in the "on" position to ensure that voltage is present as expected.

If all components are verified to be functioning correctly and the wiring is intact, but the coil still does not receive power, further investigation into the ignition control module or other related components may be necessary. It is crucial to document all findings during the troubleshooting process to facilitate a comprehensive understanding of the system's condition and to ensure that all potential issues are addressed.A 99 nissan sentra 1. 6 I recently put a new motor in and I have no power to my coil. I have changed all sensors back to my origanal. I do have ignition power and power to the crank sensor. It sounds like there is an open circuit from the ignition switch to the coil. The coil should have power when the key is on regardless of any sensor inputs. I woudl focus on checking the wiring circuit and connectors that run from the ignition switch to the condenser to the coil in the wiring schematic below: If the sensors arent plugged in correctly would that cuase power loss. I have ignition power to everything else including all my fuses. So it is more likely to not be the computer or any vaccuums. When we took it to the shop they told me that there was possibly a loose wire somewhere but he could not find it to save his life.

Try this. If you are not getting power to the ignition coil, try attaching a jumper wire from the batery positive(+) directly to the coil positive (+). If you now get spark and the engine starts, you`ve confirmed there`s a bad wire somewhere. Use the wiring diagram I sent you to trace the wires. Check continuity of the wires with with an ohmmeter (key off only), or use a voltmeter to check for voltage (key on) going backwards from the coil positive to the switch (unpolug and check all of the connectors) until you find the dead spot where the power is not getting through.

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