Question about 2003 Nissan Altima

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No start. replaced cam and crank sensors with nissan parts and still no rpm signal. i have twelve volts on red and green wire a good ground on the black wire and the white wire checked out to be good. the car did start and run after replacing the sensors and when i got back from test driving it i turned it off and it has not started back since. any ideas

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Hmm are you getting any codes???? I would recheck & see if the connector on the crank sensor didnt come unplugged.... they can be tricky think you have it plugged in good & it comes loose

Posted on Sep 15, 2010


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My neon won't start with cam position sensor plugged in. unplugged it will start and run at 2000 rpm or less. replaced sensor. no change. replaced timing belt. no change

Short on the wiring ! What year neon ? Has three wires to the sensor , one should have five volts , one is grounded inside the PCM an the other is signal return to PCM . One of these is shorted !Probably the signal return wire . Videos on youtube on testing ! Five volt reference going through the sensor to signal circuit back the PCM is shorted bring down the reference circuit inside PCM causing this .

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98 Durango 4x4 5.2 Get code crank-cam lose

Could be in the wiring, then, for those 2 sensors. I think they would both share the same 5 volt reference signal from the computer. When it stalls or goes into popcorn phase, a digital voltmeter (multi-meter) might help catch the missing signal, or it could be a poor connection for the ground for those two sensors, also. The ground connection would be known as an engine wire harness ground. But you can check the ground wire integrity at the sensor connector also.

To check the reference signal, ground voltmeter black lead to negative batt. terminal, and voltmeter red lead to sensor connector on the reference wire terminal (there's only 3 wires: reference (5 volt) wire, ground wire, and sensor signal wire to computer). Then turn key to ON. You should see very close to 5 volts at one of those terminals. If it had stalled and you had no signal, you would have to trace that wire back to the computer. By and by, you will probably need a wiring diagram.

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Apr 20, 2014 | 2002 Dodge Ram Pickup 1500

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Hello. I have a 1989 Nissan Pickup truck. It has 6 cylindars. It died recengtly while I was driving. I put fuel in as I though I had run out of gas. It started again and made it home. the next day it...

Could be the crankshaft sensor, wiring, or the coil/ignition module. Che k to see if there is power on the black/white coil wire when the key is turned to statt. If not, you have a loose wire from the ignition. If power is there, test the crank sensor.
Your crank sensor is in the distributer. Here is a test for it:

Diagnosis and Testing

For further Diagnosis and Testing of the Engine Concentrated Control System (ECCS) refer to Chapter 4 or 5 in this guide. Additional distributor and ignition coil information can be found in Chapter 3 of this guide.
CRANK ANGLE SENSOR When the ignition is ON and the main ECCS relay is activated, 12 volts is sent to the crank angle sensor LED. When a slit uncovers the photo diode and it detects the light, a 5 volt signal is sent to the ECU. The unit is easy to test but it must be removed from the engine. Refer to to test procedure below.
  1. First test the circuit to the sensor. Unplug the sensor connector, turn the ignition ON and check for 12 volts between one of the terminals and ground. The other terminals are return signals to the ECU, do not use them for voltmeter ground.
  2. Turn the ignition OFF , remove the distributor assembly and reconnect the plug to the crank angle sensor. Peel back the insulation sufficiently to connect a voltmeter to the wires. Ground the coil high tension wire.
  3. With the voltmeter connected to a good chassis ground, turn the ignitionON and slowly rotate the distributor. One of the return signal wires should have 5 volts off and on with each degree of rotation. The other should have 5 volts off and on with each 180 degrees (4 cyl.) or 120 degrees (6 cyl.) of rotation.
  4. Visually check the rotor plate for rust or damage.

If the sensor tests good, replace the coil.

Jul 30, 2017 | 1986 Nissan 200SX

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Eng starts hard,runs good until the rpm is over 2200 then it stumbles my input voltage on the cam sensor is 5volts ,on most cars i've read should have 8volts where

Both crank and cam sensors have a 8 volt reference I have found the wiring melted together where it cross over transmission shorting out the signal. also test your reference voltage at the computer with circuit unplugged at sensor watch meter and wiggle wiring going back to computer this will help find faulty area.

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1999 Gmc Sierra 4.8L cranks/No Start Using snap-on Solus Scanner. I followed basic diagnostics: Checked fuses- good Pulled PCM and BCM codes- none No spark and no fuel. No ignition power to fuel...

Did you check your CKP and CMP power wires for a short to ground? Short to ground up stream might be pulling the voltage low from the PCM. Also.. have you pulled up the underhood fuse block just to see if there's any rodent damage to the wiring under there? That's a pretty common spot for rodents to cause problems.

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2002 Nissan sentra GXE has a code p0350

call nissan give them the vin number thers a recall on the cam and crank sensors do that first
if the recall has been done and ther are no sensor codes find the missing cyl.move the coils around to see if the mis follows if not check batt volts green/white wire good ground at the black/yellow wire after that you need a lab scope to look at the wave pattern of each coil.ther should be 2-4 volt sawtooth pattern all the coils should look abought the same.

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I have a 1999 sti version 6 and it wont start even after ive entered the keypad numbers it turns over but wont start i

1. Locate the EFI main relay in the upper left side of the dash. Check the two Red wires for battery voltage with the key on. Check the Light Green wire for battery voltage from the computer key on.

2. At the computer check terminal 79 for battery voltage key on. Terminal 79 is a Yellow wire.

3. Check all power and ground inputs to the computer.

4. If the power and ground inputs are good at the computer check for a shorted 5 volt reference at the throttle position sensor and the boost sensor. A shorted 5 volt reference can cause no start, no spark with no injector pulse. 1. Check for the AC voltage waveform from the Crank sensor making it all the way to the PCM. On this Subaru, if it had a crank sensor signal, no cam sensor signal, you would see injector pulse, no spark. If it had cam sensor signal, no crank sensor signal, you would not see spark or injector pulse. Hope i helped if any more ?'s feel free to ask.....

Nov 10, 2009 | Subaru Impreza WRX STi Cars & Trucks

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My car is not getting any spark from the coil


1. At the coils, check for battery voltage at the Red wires while cranking, the Black wires should be less than 0.05 volts while cranking. Pin 3 at the coils (each wire color at the #3 pin are different) using a scope watch for a 3 - 4 volt pulse signal while cranking. Red wire - battery voltage, Black wire is a ground and the White wire is the signal circuit

2. If there is no pulse signal to the power transistors, using a scanner check the POS counts (Position) should be 179 - 181 while cranking. If inconsistent, check the signal plate (flywheel/flex plate) for damaged teeth. If there is an RPM signal and the POS counts are correct, this crankshaft sensor is good.

3. On the front of the engine, mounted on the oil pan is the crankshaft sensor (REF) reference. Check the AC voltage while cranking, should be a clean sine wave that indicates the Top Dead Center (TDC) position of each piston. White and Black wires in a 2 pin connector

4. Check the Camshaft (phase) sensor AC voltage output. This sensor should also be a clean sine wave. This sensor detects cylinder number. This sensor is located in the front cover facing the cam gear. White and Black wires in a 2 pin connector.

Nov 07, 2009 | 1995 Nissan Maxima

1 Answer

Where are the cam sensor and crank sensors located on my car?

Crank Sensor: Passenger side of transmission just to right and above the differential cover. Has 3 wires:

Light Blue/Dark Blue stripe - Signal
Dark Red - 8v supply
Black/Light Blue stripe - Ground

If the car runs or cranks, you can test this sensor by first checking for power on RED wire with key ON. Should be 8-9.5 volts DC. Furthermore, connect a dwell meter to the signal wire by probing the back of the connector. Dwell reading should be 49-51%. If not, its likely bad.

If you remove the sensor, you MUST replace the paper spacer on the end of the sensor or you risk damaging the sensor or even the torque converter drive plate otherwise. Also make sure O-ring is in good shape and positioned properly.

Cam Sensor:
Facing Engine, it is on the driver side timing case housing, on top of the round part, just to the right of the fuel rail pipe where there is a capped fuel valve.

Has 3 wires:

Tan/Yellow stripe - Signal
Dark Red - 8v supply
Black/Light Blue stripe - Ground

Testing is same as for Crank Sensor.

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