1994 Acura NSX AutomaticFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Definitions

If codes other than those listed are indicated, verify the code. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If the code indicated is not listed, replace the ECM. The Check Engine light (Malfunction Indicator Light) may come on, indicating a system problem, when, in fact, there is a poor or intermittent electrical connection. First, check the electrical connections, clean or repair connections if necessary. If the Check Engine light is on while the engine is running, jump the service check connector. If no code is displayed (Check Engine light stays on steady), the back-up system is in operation. Replace ECM and recheck. If the indication goes away, replace the original ECM.

On vehicles with automatic transaxle, the Check Engine light and DRIVE gear indicator light may come on simultaneously when the self-diagnosis indicator blinks 6, 7 and 17. Check the PGM-FI system according to the PGM-FI control system troubleshooting and recheck the DRIVE gear indicator light. To check DRIVE gear indicator light, see TROUBLESHOOTING in appropriate TRANSMISSION information.

On all vehicles, the Check Engine light and TCS indicator light may come on simultaneously when the self-diagnosis indicator blinks 3, 5, 6, 13, 15, 16, 17, 35 and 36. Check the PGM-FI system according to the PGM-FI control system troubleshooting and recheck the TCS indicator light. If it comes on, see TROUBLESHOOTING in TRACTION CONTROL article in BRAKES. The Check Engine light does not come on when there is a malfunction in the A/T FI signal. However, when the two terminals of the service check connector are connected with a jumper wire, the Check Engine light will indicate the codes.

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC Definition Go To
0 Engine Control Module (1)
1 Front Heated Oxygen Sensor DTC 1 OR 2 
2 Rear Oxygen Sensor DTC 1 OR 2 
3 MAP Sensor DTC 3 
4 CKP Position Sensor "A" DTC 4, 9, 54 OR 59 
5 MAP Sensor DTC 5 
6 ECT Sensor DTC 6 
7 Throttle Position DTC 7 
9 No. 1 CYP Position Sensor "A" DTC 4, 9, 54 OR 59 
10 IAT Sensor DTC 10 
12 EGR System DTC 12 
13 BARO Sensor DTC 13 
14 IAC System DTC 14 
15 Ignition Output Signal DTC 15 
16 Fuel Injector DTC 16 
17 Vehicle Speed Sensor DTC 17 
18 Ignition Timing Adjustment DTC 18 
21 Front VTEC Solenoid Valve DTC 21 OR 51 
22 Front VTEC Oil Pressure Switch DTC 22 OR 52 
23 Front Knock Sensor DTC 23 & 53 
30 A/T FI Signal "A" DTC 30 OR 31 
31 A/T FI Signal "B" DTC 30 OR 31 
35 Traction Control STB Signal (2)
36 Traction Control FC Signal (2)
41 Front Oxygen Sensor Heater DTC 41 OR 42 
42 Rear Oxygen Sensor Heater DTC 41 OR 42 
43 Front Fuel Supply System DTC 43 OR 44 
44 Rear Fuel Supply System DTC 43 OR 44 
45 Front Fuel Metering DTC 45 OR 46 
46 Rear Fuel Metering DTC 45 OR 46 
47 Fuel Pump DTC 47 
51 Rear VTEC Solenoid Valve DTC 21 OR 51 
52 Rear VTEC Oil Pressure Switch DTC 22 OR 52 
53 Rear Knock Sensor DTC 23 & 53 
54 CKP Sensor "B" DTC 4, 9, 54 & 59 
59 No. 1 CYP Position Sensor "B" DTC 4, 9, 54 & 59 
(1) Go to SYSTEM & COMPONENT TESTING article.
(2) See TRACTION CONTROL article.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.