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1999 NISSAN MAXIMA NO INJECTOR PULSE RATE

CHECK CAM AND CRANK SENSORS...
CHECK CAM AND CRANK SENSORS [REF POS]CHECK OK COULD'NT GET VOLTAGE AT REF CRANK SENSOR. wHAT IS VOLTAGE TO BE.
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Answered in 47 minutes by:
4/1/2009
Mike V.
Mike V., Nissan Technician
Category: Nissan
Satisfied Customers: 26,250
Experience: Nissan factory trained and Certified Subaru Technician.
Verified
HI there! Can you tell me the status of the security light when the key in turned to start the car?
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Customer reply replied 8 years ago
SECURITY STAYS ON GOES OFF WHEN TRY TO START. I'M GETTING FUEL PRESSURE GETTING SPARK NOT GETTING SIGNAL AT INJECTOR
OK. The security system turns off injector pulse. Just want to be sure the car isn't in lock out. I am assuming the light is flashing when the car is just sitting there?
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Customer reply replied 8 years ago
LIGHT IS FLASHING WHEN SITTING.
You should see battery voltage on the crank sensor red wire. If not then either the wire is broken or the eccs relay is no good. Check the 7.5 amp fuse out by the battery. It could be the culprit.
Just got your post, we have not got a security issue!
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Customer reply replied 8 years ago
GOT VOLTAGE AT RED WIRE. DID TESTING ON CAM SENSOR, REF CRANK SENSOR, AND POS CRANK SENSOR. GOT REQUIRED VOLTAGE AT THE POS BUT ON THE REF DID NOT GET VOLTAGE TESTED WITHIN OHM SPEC
Which is the REF sensor. Not sure I understand what sensor you are talking about.

OK, I am with you know. No voltage at the front crank sensor?
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Customer reply replied 8 years ago
THIS VEHICLE HAS 2 CRANK SENSORS ONE AT THE FRONT OF THE ENGINE THIS ONE IS THE REF CRANK SENSOR THIS HAS A 2 WIRE CONNECTOR AND ONE AT THE TRANS BELL HOUSING THIS ONE IS THE POS CRANK SENSOR THIS HAS A 3 WIRE CONNECTOR POS SENSOR TESTED GOOD THE REF SENSOR I DID NOT GET ANY VOLTAGE READING AT ALL
You should not get power at that sensor. You can check it by ohming it. HERE are the specs.
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Customer reply replied 8 years ago
DID THE OHMS TEST IT CHECK WITHIN SPECS
Do you have a scan tool that can read these as you crank the engine? Looking into the rp,s on the engine?
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Customer reply replied 8 years ago
I WILL CHECK THAT TOMOROW. COMES UP WITH ONE CODE FOR O2 SENSOR DON'T REMEMBER EXACT CODE WILL SEND THAT ALONG TOMORROW
OK, we may have to check some wiring on this. I would also like to have you check the injector wiring for power with the key on. You should find power on the red wire going to the injector. Not certain if it is 5 or battery voltage, but I believe it is battery voltage.
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Customer reply replied 8 years ago
HELLO JUST GOT TO DOING MORE TESTING I DID THE CRANK AND RPM TEST GETTING 175RPM CHECK RED WIRE HAVE 12 VOLTS
Customer reply replied 8 years ago
HAVE'NT RECIEVED ANYMORE INFO FROM YOU ARE WE STILL CHECKING?
Sorry, took so long to get back.
The rpms are low. The car needs 250 to run, is the battery weak? This does tell me the ecm is seeing the cam sensor. Can you test the wiring to the injectors? Should have 12 volts on one line and The other line should have a pulsing ground.
Let me know
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Customer reply replied 8 years ago
I do have 12 volts at the red wire I used a noid light did not pulse checked for pulse at ground nothing
I am thinking you may have a faulty ECM. 99 was a tough year on the ecms on these cars and it seems you have all of the things in place to have injector pulse. I will see if I can find the wiring diagram so you can check continuity on the pulse/signal wires.
Mike V.
Mike V., Nissan Technician
Category: Nissan
Satisfied Customers: 26,250
Experience: Nissan factory trained and Certified Subaru Technician.
Verified
Mike V. and 87 other Nissan Specialists are ready to help you
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Mike V.
Mike V.
Mike V., Nissan Technician
Category: Nissan
Satisfied Customers: 26,250
26,250 Satisfied Customers
Experience: Nissan factory trained and Certified Subaru Technician.

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