P0617 Starter relay circuit high input DETECTION CONDITION • The PCM monitors the starter relay signal. If the voltage at PCM terminal 108 remains low, the PCM determines that there is a starter relay circuit problem. POSSIBLE CAUSE • Starter relay malfunction • Connector or terminal malfunction • Short to power supply in the wiring harness between starter relay…
Mazda Factory OBD-II DTC P0620 Code Diagnostic Procedure
P0620 Generator control circuit malfunction DETECTION CONDITION • The PCM monitors the input voltage from the generator signal. If the voltages at PCM deviates from the threshold, the PCM terminal 213 determines that the there is a generator circuit problem. POSSIBLE CAUSE • Generator malfunction • PCM and/or generator are poorly connected • Open circuit and/or short to ground…
How to Check Engine Light for a Chevrolet Car?
Not all cars feature self testing. That style of diagnostic procedure stopped in 1996, when the Environmental Protection Agency (EPA) standardized On-Board Diagnostics (OBD-ii). Checking an engine made after 1996 requires a handheld scanner. If your Chevrolet car has the ability to self test, then it was manufactured before General Motors began to phase in…
How to diagnose fault codes in auto/truck repairs?
Your check engine light is your first indicator if the vehicle has an engine problem however, you need to find first the meaning of that engine light code and it’s equivalent repair. When your check engine light comes on in your dash, this means that vehicle engine computer (ecm) has stored some electronic signal indicating…
Mazda Factory OBD-II DTC P0483 Code Diagnostic Procedure
P0483 Fan control module range/performance problem DETECTION CONDITION • The PCM monitors the input voltage from the fan control module signal. If the voltages at PCM deviates from the threshold, the PCM terminal 318 determines that the there is a fan control module circuit problem. POSSIBLE CAUSE • Fan control module malfunction • Connector or terminal malfunction • Open…
Mazda Factory OBD-II DTC P0487 Code Diagnostic Procedure
P0487 Intake throttle valve control circuit malfunction DETECTION CONDITION • The PCM monitors that the intake throttle valve position using intake throttle valve position sensor. If the target intake throttle valve position is not equal to intake throttle valve position sensor signal, the PCM determines that the intake throttle valve control circuit malfunction POSSIBLE CAUSE • Open…
Mazda Factory OBD-II DTC P0488 Code Diagnostic Procedure
P0488 Intake throttle valve control range/performance 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 valve terminal C…
Mazda Factory OBD-II DTC P0489 Code Diagnostic Procedure
P0489 EGR control circuit range / performance (swerves to open side) DETECTION CONDITION • The PCM monitors the EGR valve position using the EGR valve position sensor. The PCM compares the target and actual EGR positions. If the PCM detects that the EGR valve position swerves to the open side more than target, the PCM determines…
Mazda Factory OBD-II DTC P0490 Code Diagnostic Procedure
P0490 EGR control circuit range / performance (swerves to close side) DETECTION CONDITION • The PCM monitors the EGR valve position using the EGR valve position sensor. The PCM compares the target and actual EGR positions. If the PCM detects that the EGR valve position swerves to the close side more than target, the PCM determines…
Mazda Factory OBD-II DTC P0500,P1934 Code Diagnostic Procedure
P0500 DTC P1934 Vehicle speed signal problem DETECTION CONDITION • The PCM monitors the vehicle speed signal from the ABS HU/CU by CAN. If the signal at PCM deviates from the threshold, the PCM determines that the there is an ABS system problem. POSSIBLE CAUSE • ABS HU/CU system malfunction • PCM malfunction Diagnostic procedure STEP INSPECTION ACTION…
Mazda Factory OBD-II DTC P0504 Code Diagnostic Procedure
P0504 Brake light switch and brake signal correlation DETECTION CONDITION • The PCM monitors changes in input signal for brake light switch and brake signal (from instrument cluster). If the PCM does not detect brake light switch signal for 1 sec. after the brake signal inputted from the instrument cluster, the PCM determines that the brake…
Mazda Factory OBD-II DTC P0562 Code Diagnostic Procedure
P0562 Battery voltage low input DETECTION CONDITION • The PCM monitors the battery voltage. If the voltage at PCM terminal 308 remains low, the PCM determines that there is a power supply circuit problem. POSSIBLE CAUSE • Generator malfunction • Battery malfunction • Connector or terminal malfunction • PCM malfunction Diagnostic procedure STEP INSPECTION ACTION 1 VERIFY FREEZE FRAME DATA…
Mazda Factory OBD-II DTC P0563 Code Diagnostic Procedure
P0563 Battery voltage high input DETECTION CONDITION • The PCM monitors the battery voltage. If the voltage at PCM terminal 308 remains high, the PCM determines that there is a power supply circuit problem. POSSIBLE CAUSE • Generator malfunction • Terminal malfunction • PCM malfunction Diagnostic procedure STEP INSPECTION ACTION 1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has…
How do I know my car or truck have a problem?
OBD-II systems are designed to alert drivers when something in the engine or emission control system begins to deteriorate or fail. When the OBD-II system determines that a problem exists a code is stored in the computer memory. The computer may illuminate a dashboard light indicating “Service Engine Soon” or “Check Engine.” This light informs…
OBD-II Diagnostic Procedures
If your vehicle is a 1996 or newer model, it comes equipped with an On-Board Diagnostics System (OBD II). This system is designed to catch emissions problems before they become a major concern. OBD alerts you to conditions that waste fuel, shorten engine life and result in potentially expensive repairs. OBD lets you know your…
Mazda Factory OBD-II DTC P0425,P0426 Code Diagnostic Procedure
P0425 P0426 Catalyst exhaust gas temperature sensor range/performance problem DETECTION CONDITION • The PCM monitors the input voltage from the catalyst exhaust gas temperature sensor signal. If the voltages at PCM deviates from the threshold, the PCM terminal 220 determines that the there is a Catalyst exhaust gas temperature sensor range/performance malfunction. POSSIBLE CAUSE • Catalyst exhaust…
Mazda Factory OBD-II DTC P0427 Code Diagnostic Procedure
P0427 Catalyst exhaust gas temperature sensor circuit low input DETECTION CONDITION • The PCM monitors the catalyst exhaust gas temperature sensor signal. If the voltage at PCM terminal 220 remains low, the PCM determines that there is a catalyst exhaust gas temperature sensor circuit problem. POSSIBLE CAUSE • Catalyst exhaust gas temperature sensor malfunction • Connector or terminal…
Mazda Factory OBD-II DTC P0428 Code Diagnostic Procedure
P0428 Catalyst exhaust gas temperature sensor circuit high input DETECTION CONDITION • The PCM monitors the catalyst exhaust gas temperature sensor signal. If the voltage at PCM terminal 220 remains high, the PCM determines that there is a catalyst exhaust gas temperature sensor circuit problem. POSSIBLE CAUSE • Catalyst exhaust gas temperature sensor malfunction • Connector or terminal…
Mazda Factory OBD-II DTC P042E Code Diagnostic Procedure
P042E EGR valve stuck open DETECTION CONDITION • The PCM monitors the EGR valve position using the EGR valve position sensor. The PCM compares the target and actual EGR positions. If the PCM detects that actual EGR valve position exceeds the target position excessively while the EGR valve is moving to close, the PCM determines that…
Mazda Factory OBD-II DTC P042F Code Diagnostic Procedure
P042F EGR valve stuck closed DETECTION CONDITION • The PCM monitors the EGR valve position using the EGR valve position sensor. The PCM compares the target and actual EGR positions. If the PCM detects that actual EGR valve position falls below the target position excessively while the EGR valve is moving to open, the PCM determines…