Code Signal Diagnosis Common Trouble Area
12 RPM Signal No G or NE signal present for 2 seconds during cranking
Open G circuit
Open, short in G or NE circuit.
Distributor
ECU
13 RPM signal No NE signal for 50msec at 1000rpm.
Same as Above
14 Ignition No IGF signal to ECU for 4 consecutive IGT signal during engine running
Open/short in IGF/IGT signal from igniter to ECU
Igniter malfunction
ECU
21 O2 sensor Open/short in heater circuit of oxygen sensor for 0.5 seconds
Amplitude of O2 sensor reduced to 0.35-0.70V continuously for more than 60 seconds
O2 sensor
vacuum sensor
ECU
22 H2O temperature sensor no signal at THW
water temperature sensor
ECU
24 Intake Air Temp sensor no signal at THA
Intake air temp sensor
ECU
25 A/F Lean O2 sensor output in less than 0.45 volts for at least 90 seconds when O2 sensor is warmed and 1500 rpm or above.
open injector circuit
lack of fuel pressure
Ignition system
Vacuum sensor
O2 sensor
ECU
31 Vacuum sensor No signal at Vacuum sensor (PIM)
Vacuum sensor to ECU
33 ISCV (Idle speed control valve) Open or short in ISCV circuit
ISCV Valve
41 Throttle Position sensor No signal for 0.5 seconds or more at ignition ON. (VTA)
TPS
ECU
42 Vehicle Speed Sensor No speed sensor signal to ECU when loaded driving condition with engine speeds 2000 to 5000 rpm. for 8 seconds or more.
VSS
ECU
43 Starter No starter signal to ECU when cranking in TEST mode. Terminal STA on ECU
starter signal circuit
starter relay
ignition switch
52 #1 Knock sensor no KNK1 signal to ECU
knock sensor (looseness)
malfunctioning knk sensor
53 #2 Knock sensor no KNK2 signal to ECU
same as above
51 Switch condition signal Displayed when A/C is on when TE1 and E1 connected in test mode
A/C switch
Accelerator pedal, cable
ECU
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