Limp mode?

Tiny
MARCUSCOBB
  • MEMBER
  • 2005 NISSAN ALTIMA
  • 130,000 MILES
My atlima wont rev up or accelerate regardless of what gear its in. I have seen several sites on this topic and the only conclusions is the throttle body or the throttle sensor unfortunately im not hip to altima engines that well please help
Friday, December 21st, 2012 AT 11:14 PM

15 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
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

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Sunday, December 23rd, 2012 AT 8:36 AM
Tiny
MARCUSCOBB
  • MEMBER
  • 5 POSTS
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!
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Thursday, December 27th, 2012 AT 4:38 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
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.
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Thursday, December 27th, 2012 AT 1:22 PM
Tiny
CRAVEONE2000YAHOOCOM
  • MEMBER
  • 1 POST
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!
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Thursday, December 27th, 2012 AT 8:57 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Are you still getting any codes?
Check for vacuum leaks.
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Friday, December 28th, 2012 AT 2:26 PM
Tiny
MARCUSCOBB
  • MEMBER
  • 5 POSTS
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!
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Saturday, December 29th, 2012 AT 1:29 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You're welcome.

Happy New Year.
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Saturday, December 29th, 2012 AT 11:32 AM
Tiny
TRASHMONSTAR
  • MEMBER
  • 3 POSTS
  • 2005 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 164,000 MILES
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.
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Tuesday, November 20th, 2018 AT 9:56 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Have the computer scanned and record the exact code numbers being set.
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Tuesday, November 20th, 2018 AT 9:56 AM (Merged)
Tiny
TRASHMONSTAR
  • MEMBER
  • 3 POSTS
P1122. P0123
But throttles been replaced.
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Tuesday, November 20th, 2018 AT 9:56 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
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.
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Tuesday, November 20th, 2018 AT 9:56 AM (Merged)
Tiny
TRASHMONSTAR
  • MEMBER
  • 3 POSTS
I have taken the car to 5 different shops.
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Tuesday, November 20th, 2018 AT 9:56 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
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
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Tuesday, November 20th, 2018 AT 9:56 AM (Merged)
Tiny
SKU
  • MEMBER
  • 1 POST
  • 2002 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 137,000 MILES
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.
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Tuesday, February 5th, 2019 AT 11:09 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
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.

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Tuesday, February 5th, 2019 AT 11:09 AM (Merged)

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