Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1997 Acura 2.5TLFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Identification
DIAGNOSTIC TROUBLE CODE (DTC) TEST DIRECTORY
| DTC (MIL/"D4" Code) (1) | Description | Go To: | ||||
|---|---|---|---|---|---|---|
| P0102 (50) | Mass Air Flow (MAF) Sensor Circuit Low Voltage Input | P0102 | ||||
| P0103 (50) | MAF Sensor Circuit High Voltage Input | P0103 | ||||
| P0112 (10) | IAT Circuit Low Voltage Input | P0112 | ||||
| P0113 (10) | IAT Circuit High Voltage Input | P0113 | ||||
| P0116 (86) | Engine Coolant Temperature (ECT) Sensor Range/Performance Problem | P0116 | ||||
| P0117 (6) | ECT Circuit Low Voltage Input | P0117 | ||||
| P0118 (6) | ECT Circuit High Voltage Input | P0118 | ||||
| P0122 (7) | Throttle Position (TP) Circuit Low Voltage Input | P0122 | ||||
| P0123 (7) | TP Circuit High Voltage Input | P0123 | ||||
| P0130 (1) | HO2S-1 Circuit Malfunction | P0130 | ||||
| P0133 (61) | HO2S-1 Slow Response | P0133 | ||||
| P0135 (41) | HO2S-1 Heater Circuit Malfunction | P0135 | ||||
| P0139 (63) | HO2S-2 Slow Response | P0139 | ||||
| P0141 (65) | HO2S-2 Heater Circuit Malfunction | P0135 | ||||
| P0171 (45) | System Too Lean | P0171 | ||||
| P0172 (45) | System Too Rich | P0171 | ||||
| P0300 (76) | Random Misfire Detected | P0300 | ||||
| P0301 (71) | Cylinder No. 1 Misfire Detected | P0301 | ||||
| P0302 (72) | Cylinder No. 2 Misfire Detected | P0301 | ||||
| P0303 (73) | Cylinder No. 3 Misfire Detected | P0301 | ||||
| P0304 (74) | Cylinder No. 4 Misfire Detected | P0301 | ||||
| P0305 (75) | Cylinder No. 5 Misfire Detected | P0301 | ||||
| P0327 (23) | Front KS Circuit Low Voltage Input | P0327 | ||||
| P0328 (23) | Front KS Circuit High Voltage Input | P0328 | ||||
| P0332 (53) | Rear KS Circuit Low Voltage Input | P0327 | ||||
| P0333 (53) | Rear KS Circuit High Voltage Input | P0328 | ||||
| P0335 (4) | Crankshaft Position (CKP) Sensor No Signal Input | P0335 | ||||
| P0336 (4) | CKP Sensor Circuit Range/Performance | P0335 | ||||
| P0401 (80) | EGR Insufficient Flow Detected | P0401 | ||||
| P0420 (67) | Catalyst System Efficiency Below Threshold | P0420 | ||||
| P0440 (90) | EVAP Control System Leak Detected | P0440 | ||||
| P0452 (91) | EVAP Control (Fuel Tank) Pressure Sensor Low Voltage | P0452 | ||||
| P0453 (91) | EVAP Control (Fuel Tank) Pressure Sensor High Voltage | P0453 | ||||
| P0500 (17) | Vehicle Speed Sensor (VSS) Circuit Low Input | P0500 | ||||
| P0505 (14) | Idle Control System Malfunction | P0505 | ||||
| P0715 (70/15) (1) | Automatic Transmission | (2) | ||||
| P0720 (70/9) (1) | Automatic Transmission | (2) | ||||
| P0725 (70/11) (1) | Automatic Transmission | (2) | ||||
| P0730 (70/-) (1) | Automatic Transmission | (2) | ||||
| P0740 (70/-) (1) | Automatic Transmission | (2) | ||||
| P0753 (70/7) (1) | Automatic Transmission | (2) | ||||
| P0758 (70/8) (1) | Automatic Transmission | (2) | ||||
| P1102 (50) | Mass Air Flow Lower Than Expected | P1102 | ||||
| P1103 (50) | Mass Air Flow Higher Than Expected | P1103 | ||||
| P1106 (13) | Barometric Pressure Circuit Range/Performance Problem | P1106 | ||||
| P1107 (13) | Barometric Pressure Circuit Low Voltage Input | P1107 | ||||
| P1108 (13) | Barometric Pressure Circuit High Voltage Input | P1107 | ||||
| P1121 (7) | Throttle Position Lower Than Expected | P1121 | ||||
| P1122 (7) | Throttle Position Higher Than Expected | P1122 | ||||
| P1297 (20) | Electrical Load Detector (ELD) Circuit Low Voltage Input | P1297 | ||||
| P1298 (20) | ELD Circuit High Voltage Input | P1298 | ||||
| P1336 (54) | Crankshaft Speed Fluctuation (CKF) Sensor Intermittent Interruption | P1336 | ||||
| P1337 (54) | CKF Sensor No Signal | P1336 | ||||
| P1359 (8) | CKP/TDC/CYP Sensor Connector Disconnected | P1359 | ||||
| P1361 (8) | TDC Sensor Intermittent Interruption | P0335 | ||||
| P1362 (8) | TDC Sensor No Signal | P0335 | ||||
| P1381 (9) | CYP Sensor Intermittent Interruption | P0335 | ||||
| P1382 (9) | CYP Sensor No Signal | P0335 | ||||
| P1491 (12) | EGR Valve Insufficient Lift Detected | P1491 | ||||
| P1498 (12) | EGR Valve Lift Sensor High Voltage | P1498 | ||||
| P1508 (14) | Idle Air Control (IAC) Valve Circuit Failure | P1508 | ||||
| P1660 (70) | A/T FI Data Line Failure | P1660 | ||||
| P1681 (30) | A/T FI Signal "A" Low Voltage | P1681 | ||||
| P1682 (30) | A/T FI Signal "A" High Voltage | P1681 | ||||
| P1686 (31) | A/T FI Signal "B" Low Voltage | P1686 | ||||
| P1687 (31) | A/T FI Signal "B" High Voltage | P1686 | ||||
| P1705 (70/5) (1) | Automatic Transmission | (2) | ||||
| P1706 (70/6) (1) | Automatic Transmission | (2) | ||||
| P1753 (70/1) (1) | Automatic Transmission | (2) | ||||
| P1758 (70/2) (1) | Automatic Transmission | (2) | ||||
| P1768 (70/16) (1) | Automatic Transmission | (2) | ||||
| P1786 (70/14) (1) | Automatic Transmission | (2) | ||||
| P1787 (70/18) (1) | Automatic Transmission | (2) | ||||
| P1790 (70/3) (1) | Automatic Transmission | (2) | ||||
| P1791 (70/4) (1) | Automatic Transmission | (2) | ||||
| P1792 (70/10) (1) | Automatic Transmission | (2) | ||||
| P1794 (70/13) (1) | Automatic Transmission | (2) | ||||
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Factory Service Tools
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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.