Error Codes : GET A HELM’S MANUAL!!!
Detection Item / Probable Cause
1 Primary O2 Sensor
Open or Short in O2 sensor circuit, bad
Primary O2 sensor
3 Manifold Absolute Pressure Sensor
Open or short in MAP sensor circuit,
bad MAPS
4 Crankshaft Position Sensor
Failed sensor or timing belt slipped, bad
CPS
5 Manifold Absolute Pressure Sensor
Reading too low or too high, bad MAP
6 Engine Coolant Temp
Circuit Reading too low, high, short or open, bad ECT
7 Throttle Position Circuit
Reading too high, low, short or open,
bad TPS
8 Crankshaft Position Sensor/ Top Dead Center Sensor/
Cylinder Position Sensor/
CKP/TDC/CYP sensor circuit
disconnected, open or short. Bad TDC
sensor.
9 Cylinder Position Sensor
Open or short in CYP circuit, bad CYP
sensor
10 Intake Air Temperature Sensor
Short or open in AIT circuit, bad AITS
13 Barometric Pressure Sensor Circuit
Bad ECM (Barometric sensor)
14 Idle Control System Malfunction
Bad IAC valve, bad fast idle thermo
valve, Throttle body
17 Vehicle Speed Sensor Circuit
Short or open in VSS circuit, bad VSS
20 Electrical Load Detector Circuit
Short or open in circuit, bad ELD
22 VTEC System Malfunction
Short or open in VTEC circuit, bad
VTEC solenoid valve, Bad VTEC
pressure switch
23 Knock Sensor Circuit
Short or open in Knock Sensor circuit,
bad Knock Sensor
30 A/T FI Signal A high/low input
Bad AFSA line, TCM
31 A/T FI Signal B high/low input
Bad AFSB line, TCM
41 Primary Heated O2 Sensor Heater
Open or short in Primary O2 sensor
heater circuit
45 System too lean/rich
Fuel supply system, Primary O2 sensor,
MAP sensor, contaminated fuel, valve
clearance, exhaust leakage
54 Crankshaft Speed Fluctuation Sensor
Open or short in CKF circuit, bad CKF
sensor
61 Primary Heated O2 Sensor
Slow response, bad O2 sensor, exhaust
leak
63 Secondary Heated O2 Sensor
Slow response, bad O2 sensor, exhaust
leak
65 Secondary Heated O2 Sensor Circuit
Open or short in secondary O2 sensor
circuit
67 Catalyst System Efficiency
System below threshold, bad catalytic
converter
70 Automatic Transaxle
A/T transmission, A/T FI data line,
TCM, ECM
71 Random Misfire (Cyl 1)
Ignition system, fuel supply system, MAP
sensor, IAC valve, contaminated fuel,
lack of fuel, fuel injector, fuel injector
circuit, low compression, valve clearance
72 Random Misfire (Cyl 2)
73 Random Misfire (Cyl 3)
74 Random Misfire (Cyl 4)
86 Engine Coolant Temp Circuit
Bad ECT sensor, bad cooling system
90 Evap Emission Control System Leak
Fuel cap loose, poor vacuum connection,
fuel tank, fuel tank pressure sensor,
EVAP bypass solenoid valve, EVAP
2-way valve, EVAP control canister
vent shut valve, EVAP canister, EVAP
purge control solenoid valve
91 Fuel Tank Pressure Sensor Circuit
Open or short in FTP circuit, Bad fuel
tank pressure sensor