P0480 Fan control circuit malfunction DETECTION CONDITION • The PCM monitors the fan control signal at PCM terminal 318. If the PCM sends signal to fan control module but voltage at terminal 318 does not change, the PCM determines that fan control circuit has malfunctioned. POSSIBLE CAUSE • Fan control module malfunction • Connector or terminal malfunction • Open…
What is Oxygen Sensor Location?
What is Oxygen Sensor Location? There are different locations in the exhaust system where O2sensors are positioned. The locations have been given numbers and will be used in the accompanying charts to identify the positions of O2sensors in most vehicles. Due to mid-year production changes or factory inconsistencies, all models may not be covered. If…
Mazda Factory OBD-II DTC P0401 Code Diagnostic Procedure
P0401 EGR flow insufficient detected DETECTION CONDITION • The PCM monitors the MAF sensor signal voltage while EGR system is operating. If the actual MAF signal is above desired signal in PCM, the PCM determines that there is a malfunction in the EGR system. POSSIBLE CAUSE • EGR valve malfunction • EGR flow passage clogged • EGR gas leakage…
Mazda Factory OBD-II DTC P0402 Code Diagnostic Procedure
P0402 EGR flow excessive detected DETECTION CONDITION • The PCM monitors the MAF sensor signal voltage while EGR system is operating. If the actual MAF signal is below desired signal in PCM, the PCM determines that there is a malfunction in the EGR system. POSSIBLE CAUSE • EGR valve malfunction • Air suction at intake-air system • Intake throttle…
Mazda Factory OBD-II DTC P0403 Code Diagnostic Procedure
P0403 EGR valve actuator circuit malfunction DETECTION CONDITION • The PCM monitors the input voltage from the EGR valve actuator signal. If the voltages at PCM deviates from the threshold, the PCM determines that the there is an EGR valve actuator circuit problem. POSSIBLE CAUSE • EGR valve actuator malfunction • Connector or terminal malfunction • Open circuit in…
Mazda Factory OBD-II DTC P0404 Code Diagnostic Procedure
P0404 EGR valve actuator control circuit range/performance problem DETECTION CONDITION • The PCM monitors the input voltage from the EGR valve actuator signal. If the voltages at PCM deviates from the threshold, the PCM determines that the there is a EGR valve actuator problem. POSSIBLE CAUSE • EGR system malfunction • PCM malfunction Diagnostic procedure STEP INSPECTION ACTION…
Mazda Factory OBD-II DTC P0405 Code Diagnostic Procedure
P0405 EGR valve position sensor circuit low input DETECTION CONDITION • The PCM monitors the EGR valve position sensor signal. If the voltage at PCM terminal 129 remains low, the PCM determines that there is a EGR valve position sensor circuit problem. POSSIBLE CAUSE • EGR valve position sensor malfunction • Connector or terminal malfunction • Open circuit in…
Mazda Factory OBD-II DTC P0406 Code Diagnostic Procedure
P0406 EGR valve position sensor circuit high input DETECTION CONDITION • The PCM monitors the EGR valve position sensor signal. If the voltage at PCM terminal 129 remains high, the PCM determines that there is a EGR valve position sensor circuit problem. POSSIBLE CAUSE • EGR valve position sensor malfunction • Connector or terminal malfunction • Short to power…
Mazda Factory OBD-II DTC P0407 Code Diagnostic Procedure
P0407 Intake throttle valve actuator control circuit low input DETECTION CONDITION • The PCM monitors that the intake throttle valve actuator driver circuit current in PCM. If the intake throttle valve actuator driver circuit current is excessive low, the PCM determines that the intake throttle valve control range/performance malfunction. POSSIBLE CAUSE • Open circuit between intake throttle…
Mazda Factory OBD-II DTC P0408 Code Diagnostic Procedure
P0408 Intake throttle valve actuator control circuit high input DETECTION CONDITION • The PCM monitors that the intake throttle valve actuator driver circuit current in PCM. If the intake throttle valve actuator driver circuit current is excessive high, the PCM determines that the intake throttle valve control range/performance malfunction. POSSIBLE CAUSE • Open circuit between intake throttle…
How to Read the Engine Light Codes Without a Computer?
You’ll Need Online access (optional) Phone/Pad Step Go to Autozone, or any chain auto parts store in your area. They have scanners and they’re not afraid to use them. These stores love do-it-yourselfers, so they’ll scan your code for free in the hopes that you’ll attempt the repair yourself and buy your parts from them….
How to Read Your OBD2 Codes Without Scan Tool?
OBD-ii trouble codes are part of a troubleshooting system that helps you track down the source of your engine’s problems. For example, if the engine’s computer recognizes a malfunction during operation, it isolates it, translates it into a code and saves it so you can access it. You retrieve it using one of the methods…
Mazda Factory OBD-II DTC P0313 Code Diagnostic Procedure
P0313 Misfire detected with low fuel DETECTION CONDITION • The PCM detects misfire when the fuel tank level is low and does not detect it when the fuel tank level is high. The PCM determines that the misfire is generated by the fuel tank level being too low. POSSIBLE CAUSE • Low fuel level • Fuel pump malfunction…
Mazda Factory OBD-II DTC P0335 Code Diagnostic Procedure
P0335 Crankshaft position (CKP) sensor circuit malfunction DETECTION CONDITION • The PCM monitors the input voltage from the CKP sensor signal. If the voltages at PCM deviates from the threshold, the PCM determines that the there is a CKP sensor circuit problem. POSSIBLE CAUSE • CKP sensor malfunction • Connector or terminal malfunction • Short to power supply between…
Mazda Factory OBD-II DTC P0336 Code Diagnostic Procedure
P0336 Crankshaft position (CKP) sensor circuit range/performance problem DETECTION CONDITION • The PCM monitors the input voltage from the CKP sensor signal. If the voltages at PCM deviates from the threshold, the PCM determines that the there is a CKP sensor problem. POSSIBLE CAUSE • CKP sensor malfunction • CKP sensor is dirty. • CKP sensor pulse wheel malfunction…
Mazda Factory OBD-II DTC P0339 Code Diagnostic Procedure
P0339 Crankshaft position (CKP) sensor circuit intermittent concern DETECTION CONDITION • The PCM monitors the input voltage from the CKP sensor signal. If the voltages at PCM deviates from the threshold, the PCM determines that the there is a CKP sensor problem. POSSIBLE CAUSE • CKP sensor circuit intermittent concern • CKP sensor pulse wheel malfunction • PCM malfunction…
Mazda Factory OBD-II DTC P0340 Code Diagnostic Procedure
P0340 Camshaft position (CMP) sensor circuit malfunction DETECTION CONDITION • The PCM monitors the input voltage from the CKP sensor signal. If the voltages at PCM deviates from the threshold, the PCM determines that the there is a CKP sensor problem. POSSIBLE CAUSE • CMP sensor malfunction • Connector or terminal malfunction • Short to power supply between CMP…
Mazda Factory OBD-II DTC P0341 Code Diagnostic Procedure
P0341 Camshaft position (CMP) sensor circuit range/performance problem DETECTION CONDITION • The PCM monitors the input voltage from the CMP sensor signal. If the voltages at PCM deviates from the threshold, the PCM determines that the there is a CMP sensor problem. POSSIBLE CAUSE • CMP sensor malfunction • CMP sensor is dirty. • CMP sensor pulse wheel malfunction…
Mazda Factory OBD-II DTC P0344 Code Diagnostic Procedure
P0344 Camshaft position (CMP) sensor circuit intermittent concern DETECTION CONDITION • The PCM monitors the input voltage from the CMP sensor signal. If the voltages at PCM deviates from the threshold, the PCM determines that the there is a CMP sensor problem. POSSIBLE CAUSE • CMP sensor circuit intermittent concern • CMP sensor pulse wheel malfunction • PCM malfunction…
Mazda Factory OBD-II DTC P0380 Code Diagnostic Procedure
P0380 Glow plug circuit malfunction DETECTION CONDITION • The PCM monitors the input voltage from the glow plug relay signal. If the voltages at PCM deviates from the threshold, the PCM determines that the there is a glow plug relay system problem. POSSIBLE CAUSE • Glow plug relay malfunction • Glow plug malfunction • Connector or terminal malfunction • Open…