Question about 1993 Nissan Altima

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1993 nissan altima code 21 ignition signal - how to fix/repair

1993 nissan altima ecu code 21 ignition signal - how to fix/repair

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    Code 303 ? What to do about to fix?



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  • Nissan Master
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Replace the O2 Sensor, reset the ECU, and subject solve.

Good luck.

Posted on Jul 19, 2010


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1 Answer

My 94 Nissan Altima ECU is giving code #21. This is for Ignition signal. Haynes manual says, "See dealer". It is also coding #11 - camshaft sensor.

Code 11 crankshaft position sensor or Camshaft position sensor. Code 21, Ignition Signal, Diagnostic Tree . Best to take to dealer for repairs and to remove codes, the codes do not mean the units are faulty ,just there is a fault, could be just a bad connection.

Mar 19, 2015 | 1994 Nissan Altima

1 Answer

Gas around plugs causing car to flood and die out

there are a couple common causes for this problem. a defective temp sensor can cause the ECU to believe that the engine is still cold thus providing extra fuel much like the choke on carberated vehickles. Throttle position sensor could possibly be sending wrong signal to the ECU. O2 sensor can become blocked with carbon thus producing wrong fuel to air mixture but most times the defective 02 sensor will reveal itself much sooner.

Dec 06, 2013 | 1993 Nissan Altima

1 Answer

19595 nissan altima tachometer

Hi Berny, I'll take a guess and say that you're not driving on the red line all the time and conclude it gets stuck up top. The Tacho gets its signal from the ECU which in turn uses the crank and camshaft sensors. unless it has the older distributor system of ignition. If it has the older type, check for short circuits to ground coming from the dist. If not check the ECU for the same and then the instrument panel. Lastly suspect the ECU. It will be a good idea to have a diagnostic scan carried out to find out if any defect has registered. Regards John

Jun 21, 2012 | 1996 Nissan Altima

1 Answer

Code 21

Try the crankshaft sensor

Jan 01, 2018 | 1991 Nissan 300ZX

1 Answer

Code 21 nissan stagea ignition signal

3_25_2012_4_37_01_pm.jpgIf you are distributor here is the need,Here is a stage.3_25_2012_4_39_42_pm.jpg

Mar 25, 2012 | Cars & Trucks

1 Answer

I need a honda car code , i can't turn on my radio

service manual.
Code Description Possible Cause
0 ECU / ECU signal No signal to ECU
1 Oxygen sensor circuit Oxygen sensor or circuit, ECU
2 Oxygen sensor circuit Oxygen sensor or circuit, ECU
3 MAP sensor circuit Map sensor circuit
4 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
5 MAP sensor circuit MAP sensor or circuit, mechanical
6 ECT sensor circuit ECT sensor or circuit, automatic
transaxle control unit
7 TPS / Angle Sensor TPS sensor or circuit, automatic
transaxle control unit
8 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
9 CMP sensor CMP sensor or circuit
10 IAT sensor IAT sensor or circuit
11 Idle Mixture Adjuster Sensor Idle mixture adjuster sensor or
12 EGR system fault No EGR action, faulty EGR valve
13 BARO sensor circuit BARO sensor or circuit
14 Idle Air Control valve circuit / ECU Open or shorted out ignition signal
circuit / No signal to ECU
15 Ignition Output signal Open or shorted ignition output
signal circuit
16 Fuel Injector Circuit Open or shorted fuel injector
17 VSS circuit VSS sensor or circuit
18 Ignition Timing Adjuster Open or shorted signal circuit
19 A/T Lock-up control solenoid Open or shorted signal circuit,
Lock-up control solenoid lock-up solenoid
20 Electrical Load Detector / Sensor Electrical load detector or circuit
Fault Code Definitions (21 - 59)
Chapter 3 22
Code Description Possible Cause
21 Spool Solenoid Valve Open or shorted signal circuit,
spool solenoid valve
22 Valve Timing Electronic Oil Open or shorted signal circuit,
pressure switch valve timing oil pressure switch
23 Knock sensor circuit Knock sensor or circuit
30 AT / ECU communication signal A AT control unit, ECU
31 AT / ECU communication signal B AT control unit, ECU
35 Traction control / ECU / signal Traction control module, ECU
36 Traction control / ECU / signal Traction control module, ECU
41 Oxygen sensor heater - left side Oxygen sensor / heater or circuit
42 Oxygen sensor heater - right side Oxygen sensor / heater or circuit
43 Fuel Supply system - left side Oxygen sensor or circuit, fuel
44 Fuel Supply system - right side Oxygen sensor or circuit, fuel
45 Fuel metering - left side Injector control circuit, incorrect
fuel metering
46 Fuel metering - right side Injector control circuit, incorrect
fuel metering
48 Heated oxygen sensor Oxygen sensor or circuit
53 Right Knock Sensor Right knock sensor or circuit
54 CKP sensor 2 CKP sensor 2 or circuit
59 CMP sensor 2 CMP sensor 2 or circuit

Dec 28, 2010 | 1994 Honda Accord

1 Answer

Replaced the speed control sensor and crankshaft sensor cleared the codes but when I turn the engine off the service engine light comes back on with the same codes showing??

Either the ECU is not getting the signal (s) that the repairs were done and to erase them. Or its receiving the signals and not doing anything about it. Check all grounds and B+ on the ECU ( make sure you wear your ground strap when you do this,). Good luck I had to replace a pin on an ECU one time.

Apr 07, 2010 | 2005 Nissan Altima

1 Answer

What does trouble code 12 mean on nissan altima

a code 12 means no G or Ne signal to the ecu im put side for at least 2 seconds that code is ground (G) so it is an open or short to ground on the ECU threw the STA circuit

Jun 28, 2009 | 1995 Nissan Altima

1 Answer

1995 Nissan Altima starts rough, will not idle, shuts off

code 55 generally means no stored faults on nissan ecu's

Jan 06, 2009 | 1995 Nissan Altima

3 Answers

1993 Nissan Altima

all new cars are computer and sensor driven the most effective way to deal with ur problem is get a diagnostic reading on your vehicle to find out the malfunctioning component. otherwise its a trail and error thing and u may fix things that r not necessary the problem. it could be something difficult or complex, the money spent on finding out whats wrong will save u future time and money

Aug 05, 2008 | 1993 Nissan Altima

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