Diagnostic Test Mode II code 21 or 12 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Kenji001 · 03-27-2009, 10:12 AM

I have a 1993 S13 Hatchback and I have an "maintenance light" in the dashboard on. I consulted the S13 manual (EF & EC-43) and found out that I have the Diagnostic Test Mode II code 21. However, is it true that code 21 doesn't give you the "maintenance light" in the dashboard? The ECU give me 3 blink lights. I think it is either 21 or 12.

Currently, the cars run fine without any problem. If it is code 21 Ignition signal circuit, my car wouldn't start, right?

If it is code 21, where can I find the harness and connector and power transistor unit?

Please advise.

Thanks!

projectRDM · 03-27-2009, 10:27 AM

Code 21 is primary ignition fault. Could be the coil, power transistor, or the camshaft position sensor circuit. Check all the front portion of the wiring harness for chafing or damage as well as the plugs for each component. The car will run fine even if there's a code stored, you'll just have an aggravated condition as it occurs.

spaznasty · 03-29-2009, 11:43 PM

does anyone have a list of all the codes... i need to do the diagnostic on my ecu tomorrow.

Kenji001 · 03-30-2009, 02:37 PM

Try 1991-1994 240sx: Reading computer(ECU) codes: Nissan Online Mechanic: Nissan Forums / Infiniti Forums - NICOclub

Where can I find the coil, power transistor, and the camshaft position sensor circuit?

projectRDM · 03-30-2009, 03:30 PM

Quote:

Originally Posted by Kenji001

Try 1991-1994 240sx: Reading computer(ECU) codes: Nissan Online Mechanic: Nissan Forums / Infiniti Forums - NICOclub

Where can I find the coil, power transistor, and the camshaft position sensor circuit?

Under the hood. You do know what a coil is, right? You're scaring me.

The coil is mounted on the driver fender well, the transistor is mounted to it. CMPS is internal within the distributor.

Download an FSM for more info, this is basic auto maintenance.

Kenji001 · 04-04-2009, 12:27 AM

I followed the FSM page EF & EC-104, 105, 161, and 168. The only thing that I can't take off is the "resistor and condenser harness connector." Any tips on removing it? And where can I buy one? I googled but cannot find the part "resistor and condenser harness connector."

Please advise.

Thanks!

03-27-2009, 10:12 AM	#1
Kenji001 Zilvia Junkie Join Date: Jan 2008 Location: San Francisco Bay Area, CA Posts: 320 Trader Rating: (0) Feedback Score: 0 reviews	Diagnostic Test Mode II code 21 or 12 I have a 1993 S13 Hatchback and I have an "maintenance light" in the dashboard on. I consulted the S13 manual (EF & EC-43) and found out that I have the Diagnostic Test Mode II code 21. However, is it true that code 21 doesn't give you the "maintenance light" in the dashboard? The ECU give me 3 blink lights. I think it is either 21 or 12. Currently, the cars run fine without any problem. If it is code 21 Ignition signal circuit, my car wouldn't start, right? If it is code 21, where can I find the harness and connector and power transistor unit? Please advise. Thanks!

03-27-2009, 10:27 AM	#2
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 47 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	Code 21 is primary ignition fault. Could be the coil, power transistor, or the camshaft position sensor circuit. Check all the front portion of the wiring harness for chafing or damage as well as the plugs for each component. The car will run fine even if there's a code stored, you'll just have an aggravated condition as it occurs. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

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03-29-2009, 11:43 PM	#3
spaznasty Join Date: Feb 2009 Location: beaufort sc Age: 31 Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	does anyone have a list of all the codes... i need to do the diagnostic on my ecu tomorrow.

03-30-2009, 02:37 PM	#4
Kenji001 Zilvia Junkie Join Date: Jan 2008 Location: San Francisco Bay Area, CA Posts: 320 Trader Rating: (0) Feedback Score: 0 reviews	Try 1991-1994 240sx: Reading computer(ECU) codes: Nissan Online Mechanic: Nissan Forums / Infiniti Forums - NICOclub Where can I find the coil, power transistor, and the camshaft position sensor circuit?

04-04-2009, 12:27 AM	#6
Kenji001 Zilvia Junkie Join Date: Jan 2008 Location: San Francisco Bay Area, CA Posts: 320 Trader Rating: (0) Feedback Score: 0 reviews	I followed the FSM page EF & EC-104, 105, 161, and 168. The only thing that I can't take off is the "resistor and condenser harness connector." Any tips on removing it? And where can I buy one? I googled but cannot find the part "resistor and condenser harness connector." Please advise. Thanks!