Limp mode?

It sounds like the car is in limp mode which will cause no power problem. We should start by running the codes to see what comes up here is a guide to help you.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If no codes are present it sounds like the catalytic converter might be plugged here is a guide to test it.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

I would service the throttle bore as well it could be causing the car to go into limp mode.

https://www.2carpros.com/articles/throttle-actuator-service

Please run this test and get back to us.

Cheers

yes the codes i got where p1122 and p1126 starts with no problem but now it idles high 14,000rpms and it only revs up to about 21,000rpms.....i tried the relearning techniques and still no avail it shifts into each gear with no problem and will move on its on but when i accelerate it doesn't move any faster than if i were not accelerating! i've read other people replacing the cam and crankshaft sensor and still have the same problem any ideas on this???? I also changed out the plugs too!

Figured it couldn't hurt plus it was time too!

PROCEDURE FOR DIAGNOSTIC TROUBLE CODES P1126

1. Turn ignition switch ON and wait at least 2 seconds.
2. Select "DATA MONITOR" mode with scan tool.
3. Start engine and let it idle for 5 seconds.
4. If DTC is detected, go to "DIAGNOSTIC PROCEDURE ".

Specification data are reference values and are measured between each terminal and ground.

CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.


DIAGNOSTIC PROCEDURE

1. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY
CIRCUIT-I

1. Turn ignition switch OFF.
2. Check voltage between ECM terminal 104 and ground with tester.
Voltage: Battery voltage

OK: GO TO 5
NG: GO TO 2.

2. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY
CIRCUIT-II

1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector E121.
3. Check continuity between ECM terminal 104 and IPDM E/R terminal 47. Continuity should exist.
4. Also check harness for short to ground and short to power.
OK: GO TO 4.
NG: GO TO 3.

3. DETECT MALFUNCTIONING PART
Check the following.
l Harness connectors E19, F33
l Harness for open or short between ECM and IPDM E/R
: Repair open circuit or short to ground or short to power in harness or connectors if problem found.

4. CHECK FUSE
1. Disconnect 15A fuse.
2. Check 15A fuse for blown.
OK: GO TO 8.
NG: Replace 15A fuse.

5. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I

1. Check voltage between ECM terminal 3 and ground under the following conditions with tester.

Ignition switch -
OFF = 0V
ON = Battery voltage (11 - 14V)

OK: GO TO 8 .
NG: GO TO 6.

6. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II
1.Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect IPDM E/R harness connector E124.
4. Check continuity between ECM terminal 3 and IPDM E/R terminal 42. Continuity should exist.
5. Also check harness for short to ground and short to power.
OK: GO TO 8 .
NG: GO TO 7.

7. DETECT MALFUNCTIONING PART
Check the following.
l Harness connectors E20, F32
l Harness for open or short between ECM and IPDM E/R
: Repair open circuit or short to ground or short to power in harness or
connectors.

8. CHECK INTERMITTENT INCIDENT
OK: Replace IPDM E/R.
NG: Repair or replace harness or connectors.

it funny yu posted this because i couldnt get to sleep thinking about the issue so i came across this in a manual that i dwnloaded and i checked the fuse!......WTF yes it turns out that was the problem but now im getting fluctuation rpms when I start up the car i did the relearn procedures (with a stop watch) and time it perfectly but rpms still fluctuating....when i drive it i can just put it in drive and it accelerates up to 20-25mph on it own!!!! fix one thing something else goes wrong.....ugggg!!!

Are you still getting any codes?
Check for vacuum leaks.

i ended up taking it to the nissan dealer for the idle air reprogram a friend of mine told me that since the manual reset wasnt working that was the only option left! they hit me for $125 but she runs like new
no MIL no codes just in time for emissions too!!! i really appreciate the help! i see now why alotta ppl stick to old school engines this problem would have been so much easier to deal with!!! thanks again!!!!

You're welcome.

Happy New Year.

I was driving down the highway when my car started losing g acceleration. It went into what I assume is limp mode. My catalytic converters were plugged. I fixed that problem. I've replaced all the spark plugs, boots, coil packs, one of the 02 sensors, a gasket, throttle body, so on.

I can't get my car out of limp mode. It won't go past 1500 Rev and car moves like 1 mph. It starts fine, but just doesn't seem like any gas is going to the car. Can't accelerate.

Have the computer scanned and record the exact code numbers being set.

P1122. P0123
But throttles been replaced.

You have issues in the "drive by wire" circuits and it's going to take so very in depth testing with equipment you likely don't have to get to the bottom of it. I woulds suggest finding a competent shop to do some diagnostics for you.

I have taken the car to 5 different shops.

Apparently not the right one. This is not a job for your neighborhood Firestone or PepBoys. You need a shop that specializes is auto electric or the dealer. The dealer is always a last resort.
This is really something that a good driveability tech would have no problem with. They just have to go through the circuit systematically using a DVOM, high grade scan tool and lab scope.and they will find the problem

My car will idle but not rev up past 1100 rpm without stalling. It was fine one day the next i went to start it and it would not. i put it on the computer, no codes. Now I can start it and it idles push the pedal it stalls. After it will not start again for ten to fifteen minutes and does the same thing. Any ideas? I have checked connections, relay, plugs and wires.

Hello,

Here is a guide that will help you fix limp mode

https://www.2carpros.com/articles/reduced-power-limp-mode


Please run down this guide and report back.